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Journal articles on the topic 'Scanner'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Burde, Alexandru Victor, Marius Manole, Radu-Septimiu Campian, Cosmin Sinescu, and Sorana Baciu. "In vitro Comparison of Accuracy of Two Scanners Used in Dental Medicine." Revista de Chimie 70, no. 7 (2019): 2344–46. http://dx.doi.org/10.37358/rc.19.7.7336.

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This experimental study aims to highlight and compare the resolution and accuracy (trueness and fidelity) of an intraoral scanner and a laboratory scanner. In order to achieve the aim of this study, an experimental model consisting of a die with a standard preparation for a porcelain-fused to metal crown was manufactured from a physiognomic polymethylmethacrylate resin. The experimental model was scanned with an industrial CT to obtain the virtual reference model. Then, the die was scanned 15 times with each scanner. In order to asses trueness, comparisons were made with the virtual reference

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Bohner, Lauren, Daniel Habor, Klaus Radermacher, Stefan Wolfart, and Juliana Marotti. "Scanning of a Dental Implant with a High-Frequency Ultrasound Scanner: A Pilot Study." Applied Sciences 11, no. 12 (2021): 5494. http://dx.doi.org/10.3390/app11125494.

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The purpose of this in vitro study was to assess the trueness of a dental implant scanned using an intraoral high-frequency ultrasound prototype and compared with conventional optical scanners. An acrylic resin cast containing a dental implant at position 11 was scanned with a fringe projection 3D sensor for use as a reference dataset. The same cast was scanned 10 times for each group. Ultrasound scanning was performed with a high-frequency probe (42 MHz, aperture diameter of 4 mm and focus length of 8 mm), and 3D images were reconstructed based on the depth of each surface point echo. Optical

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Al-Dulaijan, Yousif A., Haidar Alalawi, Mohammed M. Gad, Faisal D. Al-Qarni, Shaimaa M. Fouda, and Passent Ellakany. "Trueness and precision of complete denture digital impression compared to conventional impression: an in vitro study." PeerJ 13 (February 26, 2025): e19075. https://doi.org/10.7717/peerj.19075.

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Background This study aimed to compare the precision and trueness of digital impressions of the edentulous arch made with different scanners to conventional physical impressions. Methods A total of 40 impressions of a completely edentulous maxillary arch model (n = 10) were made using different digital impressions with an extraoral scanner, E3 3Shape desktop scanner, as the reference scan, intraoral scanner (TRIOS IOS, and Medit IOS) and Vinyl Polysiloxane impressions (VPS) impression using a Computer-Aided Design and Computer-Aided Manufacturing (CAD-CAM) custom tray. The VPS impression was s

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Cai, HongXin, Bing Cheng Zhao, Yueyi Tian, et al. "Design of a Single-Tooth Model and Its Application in Oral Scan System Assessment." Scanning 2021 (March 21, 2021): 1–8. http://dx.doi.org/10.1155/2021/8891396.

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Intraoral scanners have been widely used in the application of dentistry. Accuracy includes trueness and precision; they have an important position in the assessment of intraoral scanners. The existing standard models are divided into the inlay and the crown, but the operation is relatively complicated. In this study, in order to simplify the current standard model, we designed a new integration model to compare the accuracy of two intraoral scanners (CEREC and TRIOS) and an extraoral scanner (SHINING). The coordinate measuring machine measured value is the gold standard. Values of the length

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Rotar, Raul Nicolae, Anca Jivanescu, Codruta Ille, et al. "Trueness and Precision of Two Intraoral Scanners: A Comparative In Vitro Study." Scanning 2019 (October 21, 2019): 1–6. http://dx.doi.org/10.1155/2019/1289570.

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The aim of this study was to evaluate the accuracy of two intraoral scanners used in the dental office. A molar fixed in a typodont was prepared for a ceramic onlay. The preparation was scanned using a high-resolution scanner (reference scanner) and saved as stereolithography (STL) format. The prepared resin molar was scanned again using the intraoral scanners, and all the scans were saved as well in STL format. All STL files were compared using metrology software (Geomagic Control X). Overlapping the meshes allowed the assessment of the scans in terms of trueness and precision. Based on the r

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Velu, Juliëtte F., Erik Groot Jebbink, Jean-Paul PM de Vries, Job AM van der Palen, Cornelis H. Slump, and Robert H. Geelkerken. "A phantom study for the comparison of different brands of computed tomography scanners and software packages for endovascular aneurysm repair sizing and planning." Vascular 26, no. 2 (2017): 198–202. http://dx.doi.org/10.1177/1708538117726648.

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Objectives Correct sizing of endoprostheses used for the treatment of abdominal aortic aneurysms is important to prevent endoleaks and migration. Sizing requires several steps and each step introduces a possible sizing error. The goal of this study was to investigate the magnitude of these errors compared to the golden standard: a vessel phantom. This study focuses on the errors in sizing with three different brands of computed tomography angiography scanners in combination with three reconstruction software packages. Methods Three phantoms with a different diameter, altitude and azimuth were

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Ruzgienė, Birutė, Renata Bagdžiūnaitė, and Vilma Ruginytė. "SCANNING AERIAL PHOTOS USING A NON-PROFESSIONAL SCANNER." Geodesy and Cartography 38, no. 3 (2012): 118–21. http://dx.doi.org/10.3846/20296991.2012.728901.

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For scanning analog aerial photographs, digital photogrammetry requires specific and expensive photogrammetric scanners. However, we only have a simple A4 format scanner useful for solving some special photogrammetric tasks applied for analyzing the possibilities of scanning photographic material. The paper investigates the peculiarities of scanning analog aerial photos using the scanner processing pictures smaller than an A4 format. The achieved results are compared with digital data obtained using a professional photogrammetric scanner. Experimental photogrammetric measurements have showed t

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Carvalho, William S., Viviane de S. M. Almeida, Leonardo Provedel, Anderson da S. Maciel, and Viviane A. Sarmento. "Volumetric Evaluation of 3D Models Generated by Different Surface Treatment Protocols." European Journal of Dental and Oral Health 3, no. 5 (2022): 5–8. http://dx.doi.org/10.24018/ejdent.2022.3.5.229.

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The objective of this study was to compare the volume of three-dimensional (3D) models generated by different scanners and computational modeling protocols. Eight dry mandibles were scanned by five different computed tomography (CT) scanners and by a 3D-scanner. Three-dimensional models were generated, received different surface treatment processes, and the final volume of the 3D models was compared. The results show that there was no significant difference among the volume of the 3D models generated by the different CT scanners and surface treatment techniques, however, the model volume gener

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Rabah, Chaima Ben, Gouenou Coatrieux, and Riadh Abdelfattah. "Boosting up Source Scanner Identification Using Wavelets and Convolutional Neural Networks." Traitement du Signal 37, no. 6 (2020): 881–88. http://dx.doi.org/10.18280/ts.370601.

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In this paper, we present a conceptually innovative method for source scanner identification (SSI), that is to say, identifying the scanner at the origin of a scanned document. Solutions from literature can distinguish between scanners of different brands and models but fail to differentiate between scanners of the same models. To overcome this issue, the approach we propose takes advantage of a convolutional neural network (CNN) to automatically extract intrinsic scanner features from the distribution of the coefficients of the diagonal high-frequency (HH) sub-band of the discrete stationary

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Nestle, U., S. Kremp, D. Hellwig, et al. "Multi-centre calibration of an adaptive thresholding method for PET-based delineation of tumour volumes in radiotherapy planning of lung cancer." Nuklearmedizin 51, no. 03 (2012): 101–10. http://dx.doi.org/10.3413/nukmed-0452-11-12.

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SummaryPurpose: To evaluate the calibration of an adaptive thresholding algorithm (contrastoriented algorithm) for FDG PET-based delineation of tumour volumes in eleven centres with respect to scanner types and image data processing by phantom measurements. Methods: A cylindrical phantom with spheres of different diameters was filled with FDG realizing different signal-to-background ratios and scanned using 5 Siemens Biograph PET/CT scanners, 5 Philips Gemini PET/CT scanners, and one Siemens ECAT-ART PET scanner. All scans were analysed by the contrast-oriented algorithm implemented in two dif

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Xue, Song, Rui Guo, Karl Peter Bohn, et al. "A cross-scanner and cross-tracer deep learning method for the recovery of standard-dose imaging quality from low-dose PET." European Journal of Nuclear Medicine and Molecular Imaging 49, no. 6 (2021): 1843–56. http://dx.doi.org/10.1007/s00259-021-05644-1.

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Abstract Purpose A critical bottleneck for the credibility of artificial intelligence (AI) is replicating the results in the diversity of clinical practice. We aimed to develop an AI that can be independently applied to recover high-quality imaging from low-dose scans on different scanners and tracers. Methods Brain [18F]FDG PET imaging of 237 patients scanned with one scanner was used for the development of AI technology. The developed algorithm was then tested on [18F]FDG PET images of 45 patients scanned with three different scanners, [18F]FET PET images of 18 patients scanned with two diff

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Pawar, Prasanna, Akanksha Katkade, Kishor M. Mahale, Smita Khalikar, and Vilas Rajguru. "Comparative evaluation of accuracy of post space scanned with three different techniques." International Journal of Oral Health Dentistry 9, no. 3 (2023): 201–4. http://dx.doi.org/10.18231/j.ijohd.2023.037.

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The aim of this in vitro study is to compare three different techniques of scanning post space at different depths.The important factor for success of treatment depends on endodontic treatment as well as by restoring it with prosthodontic treatment. The post is mainly used to retain and hold the core so that crown prosthesis can be given.Fifteen freshly extracted single rooted teeth were selected and endodontically treated. Post space were created. Total Sample size taken was fifteen. There were three groups each with sample size of five. First group consist of Post space scanned with Omnicam

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Majstorović, Nemanja, Luka Čerče, Davorin Kramar, et al. "Examination of Scanner Precision by Analysing Orthodontic Parameters." Balkan Journal of Dental Medicine 21, no. 1 (2017): 32–43. http://dx.doi.org/10.1515/bjdm-2017-0005.

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Summary Background: 3D modelling in orthodontics is becoming an increasingly widespread technique in practice. One of the significant questions already being asked is related to determining the precision of the scanner used for generating surfaces on a 3D model of the jaw. Materials and methods: This research was conducted by generating a set of identical 3D models on Atos optical 3D scanner and Lazak Scan laboratory scanner, which precision was established by measuring a set of orthodontic parameters (54 overall) in all three orthodontic planes. In this manner we explored their precision in s

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Brintouch, Ido, Aisha Ali, Georgios E. Romanos, and Rafael A. Delgado-Ruiz. "Influence of Simulated Skin Color on the Accuracy of Face Scans." Prosthesis 6, no. 6 (2024): 1372–82. http://dx.doi.org/10.3390/prosthesis6060099.

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Aims: this study aims to investigate the impact of simulated skin color and the use of fiducial markers on the accuracy of 3D facial scans, comparing two types of structured light scanners under constant ambient lighting conditions. Materials and Methods: Three mannequins with different skin colors—black, white, and pink—were scanned using two light based hand-held scanners (infrared light and blue-light). Each mannequin was scanned with and without fiducial markers placed on defined anatomical landmarks. A total of one hundred thirty-two scans were performed and converted into standard tessel

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Khan, Zohaib, Faisal Shafait, and Ajmal Mian. "Converting a Common Low-Cost Document Scanner into a Multispectral Scanner." Sensors 19, no. 14 (2019): 3199. http://dx.doi.org/10.3390/s19143199.

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Forged documents and counterfeit currency can be better detected with multispectral imaging in multiple color channels instead of the usual red, green and blue. However, multispectral cameras/scanners are expensive. We propose the construction of a low cost scanner designed to capture multispectral images of documents. A standard sheet-feed scanner was modified by disconnecting its internal light source and connecting an external multispectral light source comprising of narrow band light emitting diodes (LED). A document was scanned by illuminating the scanner light guide successively with dif

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Favero, Riccardo, Andrea Volpato, Maurizio De Francesco, Adolfo Di Fiore, Riccardo Guazzo, and Lorenzo Favero. "Accuracy of 3D digital modeling of dental arches." Dental Press Journal of Orthodontics 24, no. 1 (2019): 038e1–037e7. http://dx.doi.org/10.1590/2177-6709.24.1.38.e1-7.onl.

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ABSTRACT Objective: The aim of the study was to verify and compare the accuracy of full-arch digital impressions obtained using two intraoral scanners and three scanning methodologies. Methods: A resin model created with dental 3-D printing was scanned by a reference scanner (Zfx Evolution - Zimmer Biomet, Palm Beach Gardens, FL) in order to obtain a 3D reference; the same resin model was then scanned with two different intraoral scanners (Zfx IntraScan and Carestream 3600 - CS 3600®, Carestream, Rochester, NY, USA) using: Technique A (from tooth #27 up to tooth #17); Technique B (from tooth #

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Costa, Vitória, António Sérgio Silva, Rosana Costa, Pedro Barreiros, Joana Mendes, and José Manuel Mendes. "In Vitro Comparison of Three Intraoral Scanners for Implant—Supported Dental Prostheses." Dentistry Journal 10, no. 6 (2022): 112. http://dx.doi.org/10.3390/dj10060112.

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With continuing technological developments, there have been advances in the field of fixed prosthetics, particularly in impression-taking techniques. These technological advances mean that a wide variety of diagnostic and/or rehabilitation possibilities can be explored without the need for physical models. The aim of this study was to evaluate the accuracy of three intraoral scanners used in oral implant rehabilitation using an extraoral scanner as a reference and varying the scanning area. Three models representing different clinical scenarios were scanned 15 times by each intraoral scanner a

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Tangthaweesuk, Nichakun, and Somchart Raocharernporn. "The accuracy of three-dimensional facial scan obtained from three different 3d scanners." PLOS One 20, no. 5 (2025): e0322358. https://doi.org/10.1371/journal.pone.0322358.

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This study aimed to compare the accuracy (trueness and precision) and reproducibility of three 3D facial scanning systems: a laser scanner (Planmeca Proface), a dual-structured light scanner (EinScan H2), and a smartphone application (EM3D Scanner). Thirty subjects with skeletal deformities scheduled for orthognathic surgery were scanned using these systems, and the resulting 90 3D facial scans were compared with facial surfaces segmented from CBCT scans. Surface discrepancies were measured using root mean square (RMS) values across five facial aesthetic areas (cheeks, nasal, perioral, and men

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Jafri, Syed Riaz un Nabi, Sheraz Shamim, Sadia Muniza Faraz, Asif Ahmed, Syed Muhammad Yasir, and Jamshed Iqbal. "Characterization and calibration of multiple 2D laser scanners." PLOS ONE 17, no. 7 (2022): e0272063. http://dx.doi.org/10.1371/journal.pone.0272063.

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This paper presents the comparative evaluation of multiple compact and lightweight 2D laser scanners for their possible backpack based scanning and mapping applications. These scanners include Hokuyo URG-04LX, Slamtec RPLidar A1-M8 and Hokuyo UTM-30LX-EW scanners. Since the technical datasheets provide general information and limited working details, this research presents a thorough study on the performance of each scanner related explicitly to indoor mapping operations. A series of scanning experiments have been performed for the characterization of each scanner using statistical analysis. D

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Farook, Taseef Hasan, Saif Ahmed, Jamal Giri, Farah Rashid, Toby Hughes, and James Dudley. "Influence of Intraoral Scanners, Operators, and Data Processing on Dimensional Accuracy of Dental Casts for Unsupervised Clinical Machine Learning: An In Vitro Comparative Study." International Journal of Dentistry 2023 (November 22, 2023): 1–10. http://dx.doi.org/10.1155/2023/7542813.

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Purpose. This study assessed the impact of intraoral scanner type, operator, and data augmentation on the dimensional accuracy of in vitro dental cast digital scans. It also evaluated the validation accuracy of an unsupervised machine-learning model trained with these scans. Methods. Twenty-two dental casts were scanned using two handheld intraoral scanners and one laboratory scanner, resulting in 110 3D cast scans across five independent groups. The scans underwent uniform augmentation and were validated using Hausdorff’s distance (HD) and root mean squared error (RMSE), with the laboratory s

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Gharineiat, Zahra, Fayez Tarsha Kurdi, Krish Henny, Hamish Gray, Aaron Jamieson, and Nicholas Reeves. "Assessment of NavVis VLX and BLK2GO SLAM Scanner Accuracy for Outdoor and Indoor Surveying Tasks." Remote Sensing 16, no. 17 (2024): 3256. http://dx.doi.org/10.3390/rs16173256.

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The Simultaneous Localization and Mapping (SLAM) scanner is an easy and portable Light Detection and Ranging (LiDAR) data acquisition device. Its main output is a 3D point cloud covering the scanned scene. Regarding the importance of accuracy in the survey domain, this paper aims to assess the accuracy of two SLAM scanners: the NavVis VLX and the BLK2GO scanner. This assessment is conducted for both outdoor and indoor environments. In this context, two types of reference data were used: the total station (TS) and the static scanner Z+F Imager 5016. To carry out the assessment, four comparisons

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Sampaio-Fernandes, Manuel António, Ricardo Pinto, Paulo Rocha Almeida, Maria Margarida Sampaio-Fernandes, Duarte Marques, and Maria Helena Figueiral. "Accuracy of Extraoral Digital Impressions with Multi-Unit Implants." Applied Sciences 13, no. 15 (2023): 8769. http://dx.doi.org/10.3390/app13158769.

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The aim of this in vitro study was to evaluate the accuracy of impressions made using two different silicones and corresponding stone casts in full-arch implant rehabilitation, using two laboratory scanners. A master model with six dental implants was created, scanned with a 12-megapixel scanner and used as digital master model. Ten implant impressions were obtained via two silicone impressions systems—Coltene® and Zhermack®—using the open-tray technique and poured gypsum. Two extraoral scanning systems (S600 ARTI Zirkonzhan® and Identica T500 Medit®) were used to scan the impressions and ston

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Cutti, Andrea Giovanni, Maria Grazia Santi, Andrew H. Hansen, and Stefania Fatone. "Accuracy, Repeatability, and Reproducibility of a Hand-Held Structured-Light 3D Scanner across Multi-Site Settings in Lower Limb Prosthetics." Sensors 24, no. 7 (2024): 2350. http://dx.doi.org/10.3390/s24072350.

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The aim of this work was to assess the accuracy, repeatability, and reproducibility of a hand-held, structured-light 3D scanner (EINScan Pro 2X Plus with High Definition Prime Pack, SHINING 3D Tech. Co., Ltd., Hangzhou, China), to support its potential use in multi-site settings on lower limb prosthetics. Four limb models with different shapes were fabricated and scanned with a metrological 3D scanner (EINScan Laser FreeScan 5X, SHINING 3D Tech. Co., Ltd., Hangzhou, China) by a professional operator (OP0). Limb models were then mailed to three sites where two operators (OP1, OP2) scanned them

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Baier, Valentin, Michael Schardt, Maximilian Fink, Martin Jakobi, and Alexander W. Koch. "MEMS-Scanner Testbench for High Field of View LiDAR Applications." Sensors 22, no. 1 (2021): 39. http://dx.doi.org/10.3390/s22010039.

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LiDAR sensors are a key technology for enabling safe autonomous cars. For highway applications, such systems must have a long range, and the covered field of view (FoV) of >45° must be scanned with resolutions higher than 0.1°. These specifications can be met by modern MEMS scanners, which are chosen for their robustness and scalability. For the automotive market, these sensors, and especially the scanners within, must be tested to the highest standards. We propose a novel measurement setup for characterizing and validating these kinds of scanners based on a position-sensitive detector (PSD

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Taguchi, Narumi, Seitaro Oda, Takeshi Nakaura, et al. "Contrast enhancement in abdominal computed tomography: influence of photon energy of different scanners." British Journal of Radiology 91, no. 1081 (2018): 20170285. http://dx.doi.org/10.1259/bjr.20170285.

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Objective: Different CT scanners have different X-ray spectra and photon energies indicating that contrast enhancement vary among scanners. However, this issue has not been fully validated; therefore, we performed phantom and clinical studies to assess this difference. Methods: Two scanners were used: scanner-A and scanner-B. In the phantom study, we compared the contrast enhancement between the scanners at tube voltage peaks of 80, 100 and 120 kVp. Then, we calculated the effective energies of the two CT scanners. In the clinical study, 40 patients underwent abdominal scanning with scanner-A

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Lee, Dong-Geun, Keunbada Son, and Kyu-Bok Lee. "Comparison of the Accuracy of Intraoral Scanners Based on the Type of Tooth Preparation for a Single Crown." Applied Sciences 11, no. 20 (2021): 9399. http://dx.doi.org/10.3390/app11209399.

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The purpose of this study was to evaluate the accuracy of intraoral scanners in 10 abutments (five premolars and five molars) obtained in a dental clinic and to analyze the impacts of the volume and area of abutments on scanning accuracy. Abutment casts were scanned five times with a 3D contact scanner (DS10; Renishaw plc). The five scan files were lined up and then merged, and one high-resolution computer-aided design reference model (CRM) was obtained. To obtain a computer-aided design test model (CTM), three types of intraoral scanners (CS3600 (Carestream Dental), i500 (Medit), and EZIS PO

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Alharbi, Abdulaziz M., Saleh A. Alawaji, Mohammed Riad Yehya, and Ali A. Alenezi. "Evaluation of the accuracy of different digital scanning systems and intraoral scanning strategies: An in vitro study." Saudi Journal of Oral Sciences 11, no. 2 (2024): 125–32. http://dx.doi.org/10.4103/sjoralsci.sjoralsci_40_24.

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Abstract Introduction: Differentiating between the various available digital impression systems in terms of accuracy could help in determining the most appropriate system to be used. Aim: The purpose of this in vitro study was to evaluate the accuracy of four different intraoral scanners, along with different intraoral scanning strategies (IOSs), and using the conventional impression method. Materials and Methods: A model with prepared teeth was scanned with a laboratory scanner. Following that, the model was scanned using the following four intraoral scanners (IOSs): TRIOS, CEREC AC Omnicam,

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Stangeland, Marcus, Trond Engjom, Martin Mezl, et al. "Interobserver Variation of the Bolus-and-Burst Method for Pancreatic Perfusion with Dynamic – Contrast-Enhanced Ultrasound." Ultrasound International Open 03, no. 03 (2017): E99—E106. http://dx.doi.org/10.1055/s-0043-110475.

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Abstract Purpose Dynamic contrast-enhanced ultrasound (DCE-US) can be used for calculating organ perfusion. By combining bolus injection with burst replenishment, the actual mean transit time (MTT) can be estimated. Blood volume (BV) can be obtained by scaling the data to a vessel on the imaging plane. The study aim was to test interobserver agreement for repeated recordings using the same ultrasound scanner and agreement between results on two different scanner systems. Materials and Methods Ten patients under evaluation for exocrine pancreatic failure were included. Each patient was scanned

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Choi, Kyu Sung, Whal Lee, Joon Hyung Jung, and Eun-Ah Park. "Reproducibility of calcium scoring of the coronary arteries: comparison between different vendors and iterative reconstructions." Acta Radiologica Open 9, no. 4 (2020): 205846012092214. http://dx.doi.org/10.1177/2058460120922147.

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Background The coronary artery calcium scoring (CCS) has been widely used for cardiac risk stratification for asymptomatic patients. Purpose To assess the reproducibility of CCS performed on four different computed tomography (CT) scanners, and compare the variability between two reconstruction algorithms, filtered back projection (FBP), and iterative reconstruction (IR). Material and Methods A CCS phantom was made from agar and contained 23 pieces of chicken bones. The phantom was repeatedly scanned using four different CT scanners: Toshiba; GE; Philips; and Siemens. Images were reconstructed

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Bakoglu Malinowski, Nilay, Takashi Ohnishi, Emine Cesmecioglu, Dara S. Ross, Tetsuya Tsukamoto, and Yukako Yagi. "Optimization of Scanning Protocol for AI-Integrated Assessment of HER2 Dual Bright-Field In-Situ Hybridization Application in Breast Cancer." Bioengineering 12, no. 6 (2025): 569. https://doi.org/10.3390/bioengineering12060569.

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Accurately determining HER2 status is essential for breast cancer treatment. We developed an AI-integrated in-house application for automated Dual bright-field (BF) in situ hybridization (ISH) analysis on whole slide images (WSIs), although optimal scanning conditions remain unclear. We evaluated scanners and optimized scanning protocols for clinical application. Ten de-identified invasive breast carcinoma cases, with HER2 immunohistochemistry and FISH results, were analyzed using three scanners and six scanning protocols. WSIs scanned by Scanner ‘A’ have 0.12 µm/pixel with 0.95 NA (A1) and 1.

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Trojnacki, Maciej, Przemysław Dąbek, and Piotr Jaroszek. "Analysis of the Influence of the Geometrical Parameters of the Body Scanner on the Accuracy of Reconstruction of the Human Figure Using the Photogrammetry Technique." Sensors 22, no. 23 (2022): 9181. http://dx.doi.org/10.3390/s22239181.

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This article concerns the research of the HUBO full-body scanner, which includes the analysis and selection of the scanner’s geometrical parameters in order to obtain the highest possible accuracy of the reconstruction of a human figure. In the scanner version analyzed in this paper, smartphone cameras are used as sensors. In order to process the collected photos into a 3D model, the photogrammetry technique is applied. As part of the work, dependencies between the geometrical parameters of the scanner are derived, which allows to significantly reduce the number of degrees of freedom in the se

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Ogilvy, A., S. Collins, W. Hare, et al. "Simulated design optimization of a prototype solid tank optical CT scanner for 3D radiation dosimetry." Journal of Physics: Conference Series 2167, no. 1 (2022): 012009. http://dx.doi.org/10.1088/1742-6596/2167/1/012009.

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Abstract Optical computed tomography (CT) is one of the leading modalities for imaging gel dosimeters. There exist many prototype designs, as well as some commercial optical CT scanners that have showcased the value that gel dosimeters can provide to improve 3D dose verification for radiation treatments. However, due to factors including image accuracy, scan time, or demanding setup and maintenance there is currently no single scanner that has become a ubiquitous staple in a clinical setting. In this work, a prototype solid tank optical CT scanner is proposed that minimizes the need for a refr

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Cho, Ran-Yeong, Soo-Hwan Byun, Sang-Min Yi, et al. "Comparative Analysis of Three Facial Scanners for Creating Digital Twins by Focusing on the Difference in Scanning Method." Bioengineering 10, no. 5 (2023): 545. http://dx.doi.org/10.3390/bioengineering10050545.

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Background: Multi-dimensional facial imaging is increasingly used in hospital clinics. A digital twin of the face can be created by reconstructing three-dimensional (3D) facial images using facial scanners. Therefore, the reliability, strengths, and weaknesses of scanners should be investigated and approved; Methods: Images obtained from three facial scanners (RayFace, MegaGen, and Artec Eva) were compared with cone-beam computed tomography images as the standard. Surface discrepancies were measured and analyzed at 14 specific reference points; Results: All scanners used in this study achieved

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Michael, Arwed Elias, Andreas Heuser, Christoph Moenninghoff, et al. "Does bore size matter?—A comparison of the subjective perception of patient comfort during low field (0.55 Tesla) and standard (1.5 Tesla) MRI imaging." Medicine 102, no. 47 (2023): e36069. http://dx.doi.org/10.1097/md.0000000000036069.

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The purpose of the present study was to evaluate the subjectively perceived patient comfort during magnetic resonance imaging (MRI) examinations and to assess potential differences between a recently introduced low field MRI scanner and a standard MRI scanner. Among other characteristics, the low field MRI scanner differs from the standard MRI scanner by offering more space (wider bore size of 80 centimeter diameter) and producing less noise, which may influence the patient comfort. In total, 177 patients were surveyed after MRI scans with either the low field MRI scanner (n = 91, MAGNETOM Fre

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Provenzale, James M., Brian A. Taylor, Elisabeth A. Wilde, Michael Boss, and Walter Schneider. "Analysis of variability of fractional anisotropy values at 3T using a novel diffusion tensor imaging phantom." Neuroradiology Journal 31, no. 6 (2018): 581–86. http://dx.doi.org/10.1177/1971400918789383.

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We employed a novel diffusion tensor imaging phantom to study intra- and interscanner reproducibility on two 3T magnetic resonance (MR) scanners. Using a phantom containing thousands of hollow micron-size tubes in complex arrays, we performed two experiments using a b value of 1000 s/ms2 on two Siemens 3T Trio scanners. First, we performed 12-direction scans. Second, on one scanner, we performed two 64-direction protocols with different repetition times (TRs). We used a one-way analysis of variance to calculate differences between scanners and the Mann-Whitney U test to assess differences betw

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Ciocan, Lucian Toma, Vlad Gabriel Vasilescu, Sabina-Ana Răuță, Mihaela Pantea, Silviu-Mirel Pițuru, and Marina Imre. "Comparative Analysis of Four Different Intraoral Scanners: An In Vitro Study." Diagnostics 14, no. 13 (2024): 1453. http://dx.doi.org/10.3390/diagnostics14131453.

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(1) Background: Intraoral scanners undergo rapid advancements in hardware and software, prompting frequent updates by manufacturers. (2) Aim: This study aimed to quantitatively assess the precision of full dental arch digital impressions obtained from four different intraoral scanners: Trios 5—3SHAPE, Copenhagen, Denmark, CEREC Primescan— Dentsply Sirona, New York, NY, USA, Planmeca Emerald S—Planmeca Oy, Helsinki, Finland, and Medit i700—Medit Corp, Seoul, Republic of Korea. (3) Methods: A maxillary virtual dental model (digital master model) was created in accordance with ISO standard 20896-

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Ros, A., L. Barrientos, M. Borja-Lloret, et al. "New probe for the improvement of the Spatial Resolution in total-body PET (PROScRiPT)." EPJ Web of Conferences 253 (2021): 09004. http://dx.doi.org/10.1051/epjconf/202125309004.

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In recent decades, PET scanners have been widely used for diagnosis and treatment monitoring in nuclear medicine. The continuous effort of the scientific community has led to improvements in scanner performance. Total-body PET is one of the latest upgrades in PET scanners. These kinds of scanners are able to scan the whole body of the patient with a single bed position, since the scanner tube is long enough for the patient to fit inside. While these scanners show unprecedented efficiency and extended field-of-view, a drawback is their low spatial resolution compared to dedicated scanners. In o

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Muszyński, Zbigniew, Kinga Wawrzyniak, and Krystian Cholewa. "Empirical Analysis of the Accuracy of Pulsed Laser Scanners Under Different Measurement Conditions." Civil and Environmental Engineering Reports 35, no. 2 (2025): 185–204. https://doi.org/10.59440/ceer/202703.

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Terrestrial laser scanning is becoming increasingly widely used in engineering surveying, especially in the area of displacement monitoring and performing diagnostic measurements. Empirical assessment of laser scanner accuracy in real measurement conditions is of great importance when it comes to assessing the suitability of scanners for specific engineering applications. This paper describes an empirical analysis of the accuracy of two pulsed laser scanners: Leica ScanStation C10 and Riegl VZ-400i. The tests were conducted in two measurement environments: inside and outside a building, where

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Martins, Jorge N. R., Ricardo Pinto, Emmanuel J. N. L. Silva, et al. "3D Surface Scanning—A Novel Protocol to Characterize Virtual Nickel–Titanium Endodontic Instruments." Materials 16, no. 10 (2023): 3636. http://dx.doi.org/10.3390/ma16103636.

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The nickel–titanium (NiTi) instruments’ geometry plays an important role in their performance and behavior. The present assessment intends to validate and test the applicability of a 3D surface scanning method using a high-resolution laboratory-based optical scanner to create reliable virtual models of NiTi instruments. Sixteen instruments were scanned using a 12-megapixel optical 3D scanner, and methodological validation was performed by comparing quantitative and qualitative measurements of specific dimensions and identifying some geometric features of the 3D models with images obtained thro

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Şentürk, Ayben, Bora Akat, Mert Ocak, Mehmet Ali Kılıçarslan, and Kaan Orhan. "Comparison of Marginal and Internal Fit of CAD/CAM Ceramic Inlay Restorations Fabricated Through Model Scanner, Intraoral Scanner, and CBCT Scans." Applied Sciences 15, no. 9 (2025): 4626. https://doi.org/10.3390/app15094626.

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Background and Objectives: CBCT images have been successfully used for CAD/CAM crown restorations; however, their use for ceramic inlay restorations remains unclear. This study aimed to evaluate the marginal and internal fit of CAD/CAM ceramic inlay restorations fabricated using intraoral scanner, model scanner, and CBCT data. Materials and Methods: Inlay preparations were performed on 11 mandibular molar typodont teeth. The teeth were scanned using an intraoral scanner, an extraoral scanner, and CBCT (0.075 mm voxel size). CBCT-generated DICOM data were converted to STL format with dedicated

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Celeghin, Giordano, Giulio Franceschetti, Nicola Mobilio, et al. "Complete-Arch Accuracy of Four Intraoral Scanners: An In Vitro Study." Healthcare 9, no. 3 (2021): 246. http://dx.doi.org/10.3390/healthcare9030246.

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The purpose of this study is to define the accuracy of four intraoral scanners (IOS) through the analysis of digital impressions of a complete dental arch model. Eight metal inserts were placed on the model as reference points and then it was scanned with a laboratory scanner in order to obtain the reference model. Subsequently, the reference model was scanned with four IOS (Carestream 3600, CEREC Omnicam, True Definition Scanner, Trios 3Shape). Linear measurements were traced on an STL file between the chosen reference points and divided into four categories: three-element mesiodistal, five-e

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Spagopoulos, Dimitrios, George Kaisarlis, Foteini Spagopoulou, Demetrios J. Halazonetis, Jan-Frederik Güth, and Efstratios Papazoglou. "In Vitro Trueness and Precision of Intraoral Scanners in a Four-Implant Complete-Arch Model." Dentistry Journal 11, no. 1 (2023): 27. http://dx.doi.org/10.3390/dj11010027.

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(1) Background: New intraoral (IOS) and laboratory scanners appear in the market and their trueness and precision have not been compared. (2) Methods: Seven IOS and two laboratory scanners were used to scan a mandibular edentulous model with four parallel internal hexagon implant analogues and PEEK scan bodies. Digital models in Standard Tessellation Language (STL) were created. The master model with the scan bodies was scanned (×10) with a computerized numerical control 3D Coordinate Measuring Machine (CMM). The short (distances of adjacent scan posts) and long distances (distances of the sca

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Joteppa, Varsha, Soniya Niras, Dishita Chokhani, Tanvi A. Jadhao, Shreyas T. Bandgar, and Surbhi G. Bayaskar. "Accuracy of 3D Printed Model Acquired from Different Types of Intra Oral Scanners and 3D Printers." Journal of Pharmacy and Bioallied Sciences 16, Suppl 2 (2024): S1433—S1434. http://dx.doi.org/10.4103/jpbs.jpbs_798_23.

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ABSTRACT Objective: The aim of this study was to verify the influence of different types of intraoral scanners and 3D printers on the accuracy of printed models in comparison to plaster models obtained from conventional impressions. Material and Methods: A dental study model was used as the reference model and was molded with polyvinyl siloxane to produce the plaster models which were scanned by a reference scanner. Two types of intraoral scanners and digital files were printed by two types of 3D printers. To measure the accuracy (trueness and precision) amongst the groups, the datasets were s

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Chen, Kai, Kai Zhan, Xiaocong Yang, and Da Zhang. "Accuracy Improvement Method of a 3D Laser Scanner Based on the D-H Model." Shock and Vibration 2021 (May 25, 2021): 1–9. http://dx.doi.org/10.1155/2021/9965904.

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A three-dimensional (3D) laser scanner with characteristics such as acquiring huge point cloud data and noncontact measurement has revolutionized the surveying and mapping industry. Nonetheless, how to guarantee the 3D laser scanner precision remains the critical factor that determines the excellence of 3D laser scanners. Hence, this study proposes a 3D laser scanner error analysis and calibration-method-based D-H model, applies the D-H model method in the robot area to the 3D laser scanner coordinate for calculating the point cloud data and creatively derive the error model, comprehensively a

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Bucuresteanu, Anca, Dan Prodan, and Adrian Motomancea. "Execution of Plastic Parts Using 3D Scanners and 3D Printers." Materiale Plastice 55, no. 2 (2018): 215–18. http://dx.doi.org/10.37358/mp.18.2.4998.

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In this paper, the authors show a part of research works performed on the use of 3D scanners and 3D printers to execute plastic parts with complex surfaces. 3D scanning allows copying of certain surfaces in our environment, based on existing models. Scanned models may represent various objects, made of a wide range of materials: metals, ceramics, fabrics, plastics, leather, organic materials etc. [1]. This paper shows the results achieved using a scanner and a common and affordable - low-price - printer. 3D scanners and printers allow execution of clones of certain parts with irregular surface

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Borodina, Irina D., Leon S. Grigoryants, Magammed A. Gadzhiev, et al. "Comparative evaluation of the accuracy of the dental arch display using modern intraoral three-dimensional scanners." Russian Journal of Dentistry 26, no. 4 (2022): 287–97. http://dx.doi.org/10.17816/1728-2802-2022-26-4-287-297.

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BACKGROUND: At present, modern dentists used dental intraoral three-dimensional (3D) scanners routinely in their daily work. Obtaining an optical 3D image of the teeth and dentition helps avoid errors at the stage of obtaining traditional silicone impressions and significantly reduces the level of discomfort during dental procedures. Intraoral scanner systems are commercially available today. Despite their advantages over traditional silicone impressions, the accuracy of the optical impressions obtained during total and subtotal prosthetics on the upper and lower jaw are still questionable.&#x

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International, Journal of Medical Science and Innovative Research (IJMSIR). "A Comparative Study to Evaluate The Accuracy of Open Tray Splinted and Non-Splinted Implant Level Impressions and Impressions Obtained From Two Intraoral Scanners For Three Implants Placed in A Partially Edentulous Arch - An in Vitro Study." International Journal of Medical Science and Innovative Research (IJMSIR) 9, no. 4 (2024): 185–97. https://doi.org/10.5281/zenodo.15422901.

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<strong>Abstract</strong> Title: A comparative study to evaluate the accuracy of open tray splinted and non-splinted implant level impressions and impressions obtained from two intraoral scanners for three implants placed in a partially edentulous arch - an in vitro study <strong>Objective</strong>: The aim of this in vitro study was to compare and evaluate the accuracy of open tray splinted and non-splinted Implant level impression and impressions obtained from two intraoral scanners for three implants placed in a partially edentulous arch and to evaluate which of the two scanners used (Trios

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Nam, Na-Eun, Seung-Ho Shin, Jung-Hwa Lim, Bora Lee, June-Sung Shim, and Jong-Eun Kim. "Accuracy of Implant Position Reproduction According to Exposed Length of the Scan Body during Optical Scanning: An In Vitro Study." Applied Sciences 11, no. 4 (2021): 1689. http://dx.doi.org/10.3390/app11041689.

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Accuracy of implant position reproduction according to various types of scanners, implant placement depths, and tooth positions are unknown. The purpose of this study was to compare the accuracy of implant position reproduction for differences in the exposed length of the implant scan body according to scanner type and tooth position. Implants were placed at the positions of the lateral incisor, first premolar, and first molar in the study model at the bone level and submerged 1.5 mm, 3.0 mm, 4.5 mm, and 6.0 mm. The completed models were scanned with one type of tabletop scanner and three type

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Akiyama, Jin, Yuan Zong, Naoki Shinada, Taro Suzuki, and Yoshiharu Amano. "High-Resolution Point Cloud Registration Method for Three-Dimensional Piping Measurements." Journal of Robotics and Mechatronics 35, no. 6 (2023): 1655–62. http://dx.doi.org/10.20965/jrm.2023.p1655.

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In this study, we propose a method for generating highly accurate high-density point clouds of piping facilities using an unmanned aerial vehicle (UAV) laser scanner and a handheld laser scanner. The point cloud for each scanline measured by the UAV scanner is repositioned on the piping axis, and the handheld scanner’s 3D point cloud is subsequently registered so that the center axis of the piping coincides with the UAV point cloud as a reference. The method proposed in this study was used to accurately reconstruct linear piping measured in high winds, which can easily deteriorate measurement

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Bhatia, Niharika, and Srirengalakshmi Muthuswamy Pandian. "Evaluation of the accuracy of full-arch impressions between three different intraoral scanners and conventional impressions: A prospective in vivo study." Journal of Dental Research, Dental Clinics, Dental Prospects 18, no. 1 (2024): 77–84. http://dx.doi.org/10.34172/joddd.40841.

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<strong data-sider-select-id="bc467b4a-f3fa-459c-ac3f-000e49c9414d">Background. This in-vivo study evaluated the accuracy of full-arch digital impressions obtained through different intraoral scanning technologies regarding trueness and efficiency against the standard alginate impressions. <strong data-sider-select-id="482190c3-539f-48aa-8b34-c83f0a64de34">Methods. Alginate impressions were taken from 50 subjects, and the resulting stone casts were scanned using the Trios 3Shape desktop scanner. In-vivo scans were conducted on each participant using three intraoral scanners: Medit,

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