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Journal articles on the topic 'Image artifact'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Kromrey, M. L., D. Tamada, H. Johno, et al. "Reduction of respiratory motion artifacts in gadoxetate-enhanced MR with a deep learning–based filter using convolutional neural network." European Radiology 30, no. 11 (2020): 5923–32. http://dx.doi.org/10.1007/s00330-020-07006-1.

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Abstract Objectives To reveal the utility of motion artifact reduction with convolutional neural network (MARC) in gadoxetate disodium–enhanced multi-arterial phase MRI of the liver. Methods This retrospective study included 192 patients (131 men, 68.7 ± 10.3 years) receiving gadoxetate disodium–enhanced liver MRI in 2017. Datasets were submitted to a newly developed filter (MARC), consisting of 7 convolutional layers, and trained on 14,190 cropped images generated from abdominal MR images. Motion artifact for training was simulated by adding periodic k-space domain noise to the images. Origin

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Tang, Hui, Yu Bing Lin, Guo Yan Sun, and Xu Dong Bao. "A metal artifact reduction scheme in CT by a Poisson fusion sinogram based postprocessing method." Journal of X-Ray Science and Technology 29, no. 2 (2021): 245–57. http://dx.doi.org/10.3233/xst-200799.

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OBJECTIVE: To reduce secondary artifactes generated by the current interpolation-based metal artifact reduction (MAR) methods, this study proposes and tests a new Poisson fusion sinogram based metal artifact reduction (FS-MAR) method. METHODS: The proposed FS-MAR method consists of (1) generating the prior image, (2) forward projecting this prior image and applying the Poisson blending technique to seamlessly replace the metal-affected sinogram of the original projection in the metal projection region (MPR) by the prior image projection to get the corrected metal-free sinogram, and (3) perform

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Alanen, A., S. Bondestam, and M. Komu. "Artifacts in MR Imaging Caused by Small Quantities of Powdered Iron." Acta Radiologica 36, no. 1 (1995): 92–95. http://dx.doi.org/10.1177/028418519503600117.

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The MR image artifacts caused by minute metallic particles were investigated by imaging small powdered iron quantities from 0.01 mg to 1.7 mg in water phantoms. Images with T1-weighted GRE 3-D and T2-weighted SE 2-D sequences were reconstructed with 5 MR imagers: at 0.04 T., 0.1 T (2 scanners), 1.0 T and 1.5 T. In GRE 3-D images the artifacts were round, clearly demarcated black areas, whereas in SE 2-D images artifact areas were elliptic and surrounded by a bright irregular rim with ghost veils in the direction of frequency encoding. The area of the artifact increased slightly up to 0.1 mg of

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Boos, Johannes, Lino Morris Sawicki, Rotem Shlomo Lanzman, et al. "Metal artifact reduction (MAR) based on two-compartment physical modeling: evaluation in patients with hip implants." Acta Radiologica 58, no. 1 (2016): 70–76. http://dx.doi.org/10.1177/0284185116633911.

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Background Artifacts from metallic implants can hinder image interpretation in computed tomography (CT). Image quality can be improved using metal artifact reduction (MAR) techniques. Purpose To evaluate the impact of a MAR algorithm on image quality of CT examinations in comparison to filtered back projection (FBP) in patients with hip prostheses. Material and Methods Twenty-two patients with 25 hip prostheses who underwent clinical abdominopelvic CT on a 64-row CT were included in this retrospective study. Axial images were reconstructed with FBP and five increasing MAR levels (M30–34). Obje

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Shen, Wenting, Yang Chen, Wen Qian, et al. "Impact of respiratory motion artifact on coronary image quality of one beat coronary CT angiography." Journal of X-Ray Science and Technology 29, no. 2 (2021): 287–96. http://dx.doi.org/10.3233/xst-200812.

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BACKGROUND: Accuracy of CT-derived fractional flow reserve depends on good image quality. Thus, improving image quality during coronary CT angiography (CCTA) is important. OBJECTIVE: To investigate impact of respiratory motion artifact on coronary image quality focusing on vessel diameter and territory during one beat CCTA by a 256-row detector. METHODS: We retrospectively reviewed patients who underwent CCTA under free-breathing (n = 100) and breath-holding (n = 100), respectively. Coronary image quality is defined as 4-1 from excellent to poor (non-diagnostic) and respiratory motion artifact

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Wang, Guanglei, Pengyu Wang, Yan Li, Tianqi Su, Xiuling Liu, and Hongrui Wang. "A Motion Artifact Reduction Method in Cerebrovascular DSA Sequence Images." International Journal of Pattern Recognition and Artificial Intelligence 32, no. 08 (2018): 1854022. http://dx.doi.org/10.1142/s0218001418540228.

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Digital Subtraction Angiography (DSA) can be used for diagnosing the pathologies of vascular system including systemic vascular disease, coronary heart disease, arrhythmia, valvular disease and congenital heart disease. Previous studies have provided some image enhancement algorithms for DSA images. However, these studies are not suitable for automated processes in huge amounts of data. Furthermore, few algorithms solved the problems of image contrast corruption after artifact removal. In this paper, we propose a fully automatic method for cerebrovascular DSA sequence images artifact removal b

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Graffieti, Gabriele, and Davide Maltoni. "Artifact-Free Single Image Defogging." Atmosphere 12, no. 5 (2021): 577. http://dx.doi.org/10.3390/atmos12050577.

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In this paper, we present a novel defogging technique, named CurL-Defog, with the aim of minimizing the insertion of artifacts while maintaining good contrast restoration and visibility enhancement. Many learning-based defogging approaches rely on paired data, where fog is artificially added to clear images; this usually provides good results on mildly fogged images but is not effective for difficult cases. On the other hand, the models trained with real data can produce visually impressive results, but unwanted artifacts are often present. We propose a curriculum learning strategy and an enha

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Anderla, Andras, Dubravko Culibrk, Gaspar Delso, and Milan Mirkovic. "MR Image Based Approach for Metal Artifact Reduction in X-Ray CT." Scientific World Journal 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/524243.

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For decades, computed tomography (CT) images have been widely used to discover valuable anatomical information. Metallic implants such as dental fillings cause severe streaking artifacts which significantly degrade the quality of CT images. In this paper, we propose a new method for metal-artifact reduction using complementary magnetic resonance (MR) images. The method exploits the possibilities which arise from the use of emergent trimodality systems. The proposed algorithm corrects reconstructed CT images. The projected data which is affected by dental fillings is detected and the missing pr

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Matsuura, Hideki, Takashi Inoue, Hiromu Konno, Makoto Sasaki, Kuniaki Ogasawara, and Akira Ogawa. "Quantification of susceptibility artifacts produced on high-field magnetic resonance images by various biomaterials used for neurosurgical implants." Journal of Neurosurgery 97, no. 6 (2002): 1472–75. http://dx.doi.org/10.3171/jns.2002.97.6.1472.

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✓ Although various biomaterials such as ceramics or titanium alloy are widely used in neurosurgery, the susceptibility artifacts that appear around these materials cause problems when a magnetic resonance (MR) imager is used to assess lesions after surgery. The purpose of the present study was to quantify the susceptibility artifacts produced by various biomaterials used for neurosurgical implants. Using a 3-tesla MR imaging unit, we obtained MR images of various biomaterials, including six types of ceramics, a cobalt-based alloy (Elgiloy), pure titanium, a titanium alloy, and stainless steel.

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Oehler, M., and T. M. Buzug. "Statistical Image Reconstruction for Inconsistent CT Projection Data." Methods of Information in Medicine 46, no. 03 (2007): 261–69. http://dx.doi.org/10.1160/me9041.

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Summary Objectives: The filtered backprojection is not able to cope with metal-induced inconsistencies in the Radon space which leads to artifacts in reconstructed CT images. A new algorithm is presented that reduces the drawbacks of existing artifact reduction strategies. Methods: Inconsistent projection data are bridged by directed interpolation. These projections are reconstructed using a weighted maximum likelihood algorithm (λ-MLEM). The correlation coefficient between images of a torso phantom marked with steel markers reconstructed with λ-MLEM and images of the same torso slice without

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Mohammed, Sidi, and Muhammad Abubakar. "Evaluation of MRI Artifact in some selected centers in Kano Metropolis, Nigeria." African Health Sciences 20, no. 4 (2020): 1831–9. http://dx.doi.org/10.4314/ahs.v20i4.38.

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Background: Magnetic Resonance Imaging (MRI) artifacts can occur due to hardware or software related problems, human physiologic phenomenon or physical restrictions. Careful study design and scanning protocols can prevent certain artifacts from occurring, but some are unavoidable. Study aims: The study aimed at evaluating MRI artifact in some selected centers in Kano metropolis, Nigeria. Methodology: A descriptive cross-sectional study was conducted involving both prospective and retrospective phases across three centres in the Kano metropolis from March 2019 to August 2019. Using

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Schramm, Georg, and Claes Nøhr Ladefoged. "Metal artifact correction strategies in MRI-based attenuation correction in PET/MRI." BJR|Open 1, no. 1 (2019): 20190033. http://dx.doi.org/10.1259/bjro.20190033.

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In hybrid positron emission tomography (PET) and MRI systems, attenuation correction for PET image reconstruction is commonly based on processing of dedicated MR images. The image quality of the latter is strongly affected by metallic objects inside the body, such as e.g. dental implants, endoprostheses, or surgical clips which all lead to substantial artifacts that propagate into MRI-based attenuation images. In this work, we review publications about metal artifact correction strategies in MRI-based attenuation correction in PET/MRI. Moreover, we also give an overview about publications inve

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Korpics, Mark, Paul Johnson, Rakesh Patel, et al. "Metal Artifact Reduction in Cone-Beam Computed Tomography for Head and Neck Radiotherapy." Technology in Cancer Research & Treatment 15, no. 6 (2016): NP88—NP94. http://dx.doi.org/10.1177/1533034615618319.

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Purpose: To evaluate a method for reducing metal artifacts, arising from dental fillings, on cone-beam computed tomography images. Materials and Methods: A projection interpolation algorithm is applied to cone-beam computed tomography images containing metal artifacts from dental fillings. This technique involves identifying metal regions in individual cone-beam computed tomography projections and interpolating the surrounding values to remove the metal from the projection data. Axial cone-beam computed tomography images are then reconstructed, resulting in a reduction in the streak artifacts

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Khodarahmi, Iman, Amanda Isaac, Elliot K. Fishman, Danoob Dalili, and Jan Fritz. "Metal About the Hip and Artifact Reduction Techniques: From Basic Concepts to Advanced Imaging." Seminars in Musculoskeletal Radiology 23, no. 03 (2019): e68-e81. http://dx.doi.org/10.1055/s-0039-1687898.

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AbstractPromising outcomes of hip replacement interventions in this era of aging populations have led to higher demands for hip arthroplasty procedures. These require effective methods and techniques for the detection of postoperative outcomes and complications. Based on the presence or absence of radiographic findings, magnetic resonance imaging (MRI) and computed tomography (CT) may be required to detect and further characterize different causes of failing implants. Yet metal-related artifacts degrade image quality and pose significant challenges for adequate image quality. To mitigate such

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Huang, K. D., Ding Hua Zhang, Fang Long Zha, and M. J. Li. "Integrated Method of Enhancing Image Quality for FPD-Based Cone-Beam Computed Tomography." Key Engineering Materials 474-476 (April 2011): 1277–82. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1277.

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The main factors of impacting Cone-Beam Computed Tomography (CBCT) image quality and their causes were studied, and an integrated method of enhancing CBCT image quality was proposed according to the Digital Radiography (DR) imaging model. First, the original polychromatic X-ray was filtered into quasi-monochromatic X-ray by the filter plate of copper-tungsten alloy, in order to improve the quality of the original projection images. Then, the integrated artifact corrections for projection images were processed on the order of dark field correction, gain non-uniformity correction, scatter correc

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Yue, Dong, Cheng Fan Rong, Cai Ning, et al. "Reduction of metal artifacts from unilateral hip arthroplasty on dual-energy CT with metal artifact reduction software." Acta Radiologica 59, no. 7 (2017): 853–60. http://dx.doi.org/10.1177/0284185117731475.

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Background The evaluation of hip arthroplasty is a challenge in computed tomography (CT). The virtual monochromatic spectral (VMS) images with metal artifact reduction software (MARs) in spectral CT can reduce the artifacts and improve the image quality. Purpose To evaluate the effects of VMS images and MARs for metal artifact reduction in patients with unilateral hip arthroplasty. Material and Methods Thirty-five patients underwent dual-energy CT. Four sets of VMS images without MARs and four sets of VMS images with MARs were obtained. Artifact index (AI), CT number, and SD value were assesse

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Zhou, Peng, Chunling Zhang, Zhen Gao, Wangshu Cai, Deyue Yan, and Zhaolong Wei. "Evaluation of the quality of CT images acquired with smart metal artifact reduction software." Open Life Sciences 13, no. 1 (2018): 155–62. http://dx.doi.org/10.1515/biol-2018-0021.

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AbstractObjectiveTo evaluate the practical effectiveness of smart metal artifact reduction (SMAR) in reducing artifacts caused by metallic implants.MethodsPatients with metal implants underwent computed tomography (CT) examinations on high definition CT scanner, and the data were reconstructed with adaptive statistical iterative reconstruction (ASiR) with value weighted to 40% and smart metal artifact reduction (SMAR) technology. The comparison was assessed by both subjective and objective assessment between the two groups of images. In terms of subjective assessment, three radiologists evalua

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Ma, Min, Jing Jing Ji, and Cai Xia Zhang. "Application of Image Enhancement Algorithm in Multi-Phase Flow CT System." Applied Mechanics and Materials 130-134 (October 2011): 2103–6. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.2103.

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In this paper, image enhancement algorithm is applied to multi-phase CT system imaging. Aiming at artifact imaging of multiphase flow CT system image reconstruction, this paper uses image enhancement algorithm to enhance the reconstructed image. The simulation results prove that with a small amount projection angle data about reconstruction it can also get clear images by using image enhancement algorithm processing and also remove artifacts for reconstructed image. It is efficient to shorten the multi-phase CT system image reconstruction data collection time, and benefit to analysis multi-pha

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Diehn, Felix E., Gregory J. Michalak, David R. DeLone, et al. "CT Dental Artifact: Comparison of an Iterative Metal Artifact Reduction Technique with Weighted Filtered Back-Projection." Acta Radiologica Open 6, no. 11 (2017): 205846011774327. http://dx.doi.org/10.1177/2058460117743279.

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Background Dental hardware produces streak artifacts on computed tomography (CT) images reconstructed with the standard weighted filtered back projection (wFBP) method. Purpose To perform a preliminary evaluation of an iterative metal artifact reduction (IMAR) technique to assess its ability to improve anatomic visualization over wFBP in patients with dental amalgam or other hardware. Material and Methods CT images from patients with dental hardware were reconstructed using wFBP and IMAR software and soft-tissue or bone window/level settings. The anatomy most affected by metal artifacts was id

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Zhang, Lele, Evert Slob, Joost van der Neut, and Kees Wapenaar. "Artifact-free reverse time migration." GEOPHYSICS 83, no. 5 (2018): A65—A68. http://dx.doi.org/10.1190/geo2017-0795.1.

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We have derived an improved reverse time migration (RTM) scheme to image the medium without artifacts arising from internal multiple reflections. This is based on a revised implementation of Marchenko redatuming using a new time-truncation operator. Because of the new truncation operator, we can use the time-reversed version of the standard wavefield-extrapolation operator as initial estimate for retrieving the upgoing focusing function. Then, the retrieved upgoing focusing function can be used to directly image the medium by correlating it with the standard wavefield-extrapolation operator. T

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Kidoh, Masafumi, Daisuke Utsunomiya, Seitaro Oda, et al. "CT venography after knee replacement surgery: comparison of dual-energy CT-based monochromatic imaging and single-energy metal artifact reduction techniques on a 320-row CT scanner." Acta Radiologica Open 6, no. 2 (2017): 205846011769346. http://dx.doi.org/10.1177/2058460117693463.

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Background An optimal metal artifact reduction (MAR) technique is needed for a reliable and accurate image-based diagnosis. Purpose Using a 320-row scanner, we compared the dual-energy computed tomography (CT)-based monochromatic and the single-energy metal artifact reduction (SEMAR) techniques for CT venography (CTV) to identify the better imaging method for diagnosing deep vein thrombosis (DVT) in patients who had undergone knee replacement surgery. Material and Methods Twenty-three consecutive patients with suspected DVT after unilateral knee replacement surgery underwent dual-energy CT (13

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Zhang, Yuan, and Liyi Zhang. "A Rigid Motion Artifact Reduction Method for CT Based on Blind Deconvolution." Algorithms 12, no. 8 (2019): 155. http://dx.doi.org/10.3390/a12080155.

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In computed tomography (CT), artifacts due to patient rigid motion often significantly degrade image quality. This paper suggests a method based on iterative blind deconvolution to eliminate motion artifacts. The proposed method alternately reconstructs the image and reduces motion artifacts in an iterative scheme until the difference measure between two successive iterations is smaller than a threshold. In this iterative process, Richardson–Lucy (RL) deconvolution with spatially adaptive total variation (SATV) regularization is inserted into the iterative process of the ordered subsets expect

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Otero, Hansel J., Juan J. Cerrolaza, Judyta Loomis, et al. "Feasibility and Quality Determinants of 3D Sonography in Children With Hydronephrosis." Journal of Diagnostic Medical Sonography 34, no. 1 (2017): 31–36. http://dx.doi.org/10.1177/8756479317717201.

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The objective was to determine the image quality of 3D diagnostic medical sonography (DMS) in children with hydronephrosis. 3D DMS was assessed based on 24 pediatric patients. Image quality was evaluated by two radiologists and a sonographer in terms of rib shadowing, cut-off parenchymal edges, motion artifact, and overall quality. The interreader reliability and relation between image quality and other variables were calculated. The results were based on images of 32 hydronephrotic kidneys. The average quality scoring of the images was quite high. Rib shadowing, cut-off edges, and motion arti

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Lee, Chang-Lae, Junyoung Park, Sangnam Nam, et al. "Metal artifact reduction and tumor detection using photon-counting multi-energy computed tomography." PLOS ONE 16, no. 3 (2021): e0247355. http://dx.doi.org/10.1371/journal.pone.0247355.

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Metal artifacts are considered a major challenge in computed tomography (CT) as these adversely affect the diagnosis and treatment of patients. Several approaches have been developed to address this problem. The present study explored the clinical potential of a novel photon-counting detector (PCD) CT system in reducing metal artifacts in head CT scans. In particular, we studied the recovery of an oral tumor region located under metal artifacts after correction. Three energy thresholds were used to group data into three bins (bin 1: low-energy, bin 2: middle-energy, and bin 3: high-energy) in

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McAllister, Dianna, Mauro Mendez, Ariana Bermúdez, and Pascal Tyrrell. "Visualization of Layers Within a Convolutional Neural Network Using Gradient Activation Maps." Journal of Undergraduate Life Sciences 14, no. 1 (2020): 6. http://dx.doi.org/10.33137/juls.v14i1.35833.

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Introduction: Convolutional neural networks (CNNs) are machine learning tools that have great potential in the field of medical imaging. However, it is often regarded as a “black box” as the process that is used by the machine to acquire a result is not transparent. It would be valuable to find a method to be able to understand how the machine comes to its decision. Therefore, the purpose of this study is to examine how effective gradient-weighted class activation mapping (grad-CAM) visualizations are for certain layers in a CNN-based dental x-ray artifact prediction model. Methods: To t

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Enomoto, Yukiko, Keita Yamauchi, Takahiko Asano, Katharina Otani, and Toru Iwama. "Effect of metal artifact reduction software on image quality of C-arm cone-beam computed tomography during intracranial aneurysm treatment." Interventional Neuroradiology 24, no. 3 (2018): 303–8. http://dx.doi.org/10.1177/1591019917754039.

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Background and purpose C-arm cone-beam computed tomography (CBCT) has the drawback that image quality is degraded by artifacts caused by implanted metal objects. We evaluated whether metal artifact reduction (MAR) prototype software can improve the subjective image quality of CBCT images of patients with intracranial aneurysms treated with coils or clips. Materials and methods Forty-four patients with intracranial aneurysms implanted with coils (40 patients) or clips (four patients) underwent one CBCT scan from which uncorrected and MAR-corrected CBCT image datasets were reconstructed. Three b

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Smith, Owen F. "Object Artifact, Image Artifacts and Conceptual Artifacts: Beyond the object into the Event." Artifact 1, no. 1 (2007): 4–6. http://dx.doi.org/10.1080/17493460600610707.

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Bolstad, Kirsten, Silje Flatabø, Daniel Aadnevik, Ingvild Dalehaug, and Nils Vetti. "Metal artifact reduction in CT, a phantom study: subjective and objective evaluation of four commercial metal artifact reduction algorithms when used on three different orthopedic metal implants." Acta Radiologica 59, no. 9 (2018): 1110–18. http://dx.doi.org/10.1177/0284185117751278.

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Background Metal implants may introduce severe artifacts in computed tomography (CT) images. Over the last few years dedicated algorithms have been developed in order to reduce metal artifacts in CT images. Purpose To investigate and compare metal artifact reduction algorithms (MARs) from four different CT vendors when imaging three different orthopedic metal implants. Material and Methods Three clinical metal implants were attached to the leg of an anthropomorphic phantom: cobalt-chrome; stainless steel; and titanium. Four commercial MARs were investigated: SmartMAR (GE); O-MAR (Philips); iMA

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Lo, W. K., and J. C. H. Spence. "STM imaging of the sample or the tip ? an in situ REM study." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (1992): 1126–27. http://dx.doi.org/10.1017/s0424820100130262.

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Image interpretation for Scanning Tunneling Microscopy (STM) is complicated by inadequate tip characterization. Tip and surface features can be difficult to separate, especially for rough surfaces. Figure 1, an STM image of a gold platelet deposited onto graphite, illustrates some of the possible problems. The doubled image of the platelet and step, for example, is a commonly encountered image artifact caused by tunneling from multiple tip asperities. The shape of the platelet(s) may also be an artifact since they are usually round. Ordinarily, to confirm the interpretation of such objects, ex

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Kokhanovsky, Natalia, Alicia Nachtigal, Nadir Reindorp, and Abdel-Rauf Zeina. "Superior Mesenteric Artery-Related Aortic Pseudomass as a Form of Reverberation Artifact in a 10-Year-Old Boy." Journal of Clinical Imaging Science 4 (December 31, 2014): 73. http://dx.doi.org/10.4103/2156-7514.148268.

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Artifacts are encountered routinely in clinical ultrasonography practice. The ability to recognize and eliminate potentially correctable ultrasound artifacts is of great importance to image quality improvement and optimal patient care. We describe an example of a superior mesenteric artery-related pseudomass as a form of reverberation artifact that could lead to misinterpretation of sonographic findings. We present the ultrasonographic and computed tomography angiography findings and give an explanation for the appearance of the artifact.

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Yasaka, Koichiro, Toshihiro Furuta, Takatoshi Kubo, et al. "Full and hybrid iterative reconstruction to reduce artifacts in abdominal CT for patients scanned without arm elevation." Acta Radiologica 58, no. 9 (2017): 1085–93. http://dx.doi.org/10.1177/0284185116684675.

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Background Abdominal computed tomography (CT) without arm elevation is associated with degraded image quality due to streak artifacts. Purpose To compare the degree of streak artifacts in abdominal CT images without arm elevation between full iterative reconstruction (IR), hybrid IR, and filtered back projection (FBP) using two commercially available scanners. Material and Methods First, a phantom study simulating CT examination without arm elevation was performed. Second, unenhanced axial images of 33 patients (17 and 16 patients for each vendor) who underwent CT without arm elevation were re

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Khodarahmi, Iman, Mathias Nittka, and Jan Fritz. "Leaps in Technology: Advanced MR Imaging after Total Hip Arthroplasty." Seminars in Musculoskeletal Radiology 21, no. 05 (2017): 604–15. http://dx.doi.org/10.1055/s-0037-1606135.

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AbstractThe vast majority of the metal-related artifacts in magnetic resonance imaging (MRI) arise from B0 inhomogeneity. These artifacts include failed fat suppression, signal loss, signal pileup, and image distortions. Metal artifact reduction sequence MRI has been used to mitigate these artifacts via optimization of the scan parameters and exploiting new techniques such as fully phase-encoded imaging and multispectral imaging including multi-acquisition variable-resonance image combination and slice encoding for metal artifact correction. Applicability of MRI in the vicinity of metal implan

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Chen, Yuqing, Yunsong Huang, and Lianjie Huang. "Suppressing migration image artifacts using a support vector machine method." GEOPHYSICS 85, no. 5 (2020): S255—S268. http://dx.doi.org/10.1190/geo2019-0157.1.

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Reverse time migration (RTM) can produce high-quality images of complex subsurface structures when using seismic data acquired by a reasonably dense data acquisition geometry. However, RTM produces significant image artifacts when using data from a sparse data acquisition geometry because of incomplete cancellation of migration “smiles.” These artifacts obscure migration images of actual geology, leading to possible misidentification of important geologic features of interest. A specularity filter based on the semblance equation is commonly used in the dip-angle angle-domain common image gathe

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Yousuf, M. A., and M. Asaduzzaman. "An Efficient Ring Artifact Reduction Method Based on Projection Data for Micro-CT Images." Journal of Scientific Research 2, no. 1 (2009): 37–45. http://dx.doi.org/10.3329/jsr.v2i1.2645.

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Ring artifacts are very troublesome in a flat-panel based micro computed tomography (micro-CT) since they might severely degrade visibility of the micro-CT images. Unlike ring artifacts in other types of micro-CTs such as image-intensifier based micro-CT, ring artifacts in a flat-panel detector based micro-CT are hardly removable since the sensitivity of the pixel elements in a flat-panel detector is less uniform than in other types of x-ray detectors. The dependence of the ring artifacts on many imaging conditions, such as tube voltage, detector integration time and phantom size, was first in

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Sandler, M. A., B. L. Madrazo, R. Walter, et al. "Ultrasound case of the day. Duplication artifact (mirror image artifact)." RadioGraphics 7, no. 5 (1987): 1025–28. http://dx.doi.org/10.1148/radiographics.7.5.3331208.

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Uchida, Daiki, Yuki Amano, Hirokazu Nakatogawa, et al. "Setting pressure can change the size and shape of MRI artifacts caused by adjustable shunt valves: a study of the 4 newest models." Journal of Neurosurgery 130, no. 4 (2019): 1260–67. http://dx.doi.org/10.3171/2017.12.jns171533.

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OBJECTIVEAdjustable shunt valves that have been developed for the management of hydrocephalus all rely on intrinsically magnetic components, and artifacts with these valves on MRI are thus inevitable. The authors have previously reported that the shapes of shunt artifacts differ under different valve pressures with the proGAV 2.0 valve. In the present study the authors compared the size and shape of artifacts at different pressure settings with 4 new-model shunt valves.METHODSThe authors attached 4 new models of MRI-resistant shunt valve to the temporal scalp of a healthy volunteer: the proGAV

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Kim, Bong Soo, Kyung Ryeol Lee, and Myeng Ju Goh. "New Imaging Strategies Using a Motion-Resistant Liver Sequence in Uncooperative Patients." BioMed Research International 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/142658.

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MR imaging has unique benefits for evaluating the liver because of its high-resolution capability and ability to permit detailed assessment of anatomic lesions. In uncooperative patients, motion artifacts can impair the image quality and lead to the loss of diagnostic information. In this setting, the recent advances in motion-resistant liver MR techniques, including faster imaging protocols (e.g., dual-echo magnetization-prepared rapid-acquisition gradient echo (MP-RAGE), view-sharing technique), the data under-sampling (e.g., gradient recalled echo (GRE) with controlled aliasing in parallel

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Cha, Jihoon, Hyung-Jin Kim, Sung Tae Kim, Yi Kyung Kim, Ha Youn Kim, and Gyeong Min Park. "Dual-energy CT with virtual monochromatic images and metal artifact reduction software for reducing metallic dental artifacts." Acta Radiologica 58, no. 11 (2017): 1312–19. http://dx.doi.org/10.1177/0284185117692174.

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Background Metallic dental prostheses may degrade image quality on head and neck computed tomography (CT). However, there is little information available on the use of dual-energy CT (DECT) and metal artifact reduction software (MARS) in the head and neck regions to reduce metallic dental artifacts. Purpose To assess the usefulness of DECT with virtual monochromatic imaging and MARS to reduce metallic dental artifacts. Material and Methods DECT was performed using fast kilovoltage (kV)-switching between 80-kV and 140-kV in 20 patients with metallic dental prostheses. CT data were reconstructed

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Han, Zhenghao, Li Li, Weiqi Jin, et al. "Denoising and Motion Artifact Removal Using Deformable Kernel Prediction Neural Network for Color-Intensified CMOS." Sensors 21, no. 11 (2021): 3891. http://dx.doi.org/10.3390/s21113891.

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Image intensifiers are used internationally as advanced military night-vision devices. They have better imaging performance in low-light-level conditions than CMOS/CCD. The intensified CMOS (ICMOS) was developed to satisfy the digital demand of image intensifiers. In order to make the ICMOS capable of color imaging in low-light-level conditions, a liquid-crystal tunable filter based color imaging ICMOS was developed. Due to the time-division color imaging scheme, motion artifacts may be introduced when a moving target is in the scene. To solve this problem, a deformable kernel prediction neura

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Desai, Shrinivas D., and Linganagouda Kulkarni. "Comprehensive Survey on Metal Artifact Reduction Methods in Computed Tomography Images." International Journal of Rough Sets and Data Analysis 2, no. 2 (2015): 92–114. http://dx.doi.org/10.4018/ijrsda.2015070106.

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Over the past few years, medical imaging technology has significantly advanced. Today, medical imaging modalities have been designed with state-of-the-art technology to provide much better in-depth resolution, reduced artifacts, and improved contrast –to – noise ratio. However in many practical situations complete projection data is not acquired leading to incomplete data problem. When the data is incomplete, tomograms may blur, resolution degrades, noise increases and forms artifacts which is the most important factor in degrading the tomography image quality and eventually hinders diagnostic

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Choi, Kyu Sung, Young Hun Choi, Jung-Eun Cheon, Woo Sun Kim, and In One Kim. "Application of T1-weighted BLADE sequence to abdominal magnetic resonance imaging of young children: a comparison with turbo spin echo sequence." Acta Radiologica 61, no. 10 (2020): 1406–13. http://dx.doi.org/10.1177/0284185120901512.

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Background The image quality of abdominal magnetic resonance imaging (MRI) in children who cannot hold their breath has been severely impaired by motion artifacts. Purpose To evaluate the usefulness of T1-weighted (T1W) BLADE MRI for axial abdominal imaging in children who cannot hold their breath. Material and Methods Two different BLADE sequences, with and without an inversion recovery (IR-BLADE), were compared to conventional turbo-spin echo (TSE) with a high number of excitations in 18 consecutive patients who cannot hold their breath. Overall image quality, motion artifact, radial artifac

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Abdul-Jabbar, Jassim, and Alyaa Taqi. "Region-Based Fractional Wavelet Transform Using Post Processing Artifact Reduction." Iraqi Journal for Electrical and Electronic Engineering 8, no. 8 (2012): 45–53. http://dx.doi.org/10.37917/ijeee.8.1.5.

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Wavelet-based algorithms are increasingly used in the source coding of remote sensing, satellite and other geospatial imagery. At the same time, wavelet-based coding applications are also increased in robust communication and network transmission of images. Although wireless multimedia sensors are widely used to deliver multimedia content due to the availability of inexpensive CMOS cameras, their computational and memory resources are still typically very limited. It is known that allowing a low-cost camera sensor node with limited RAM size to perform a multi-level wavelet transform, will in r

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Olszewski, Raphael. "Artifacts related to cone beam computed tomography technology (CBCT) and their significance for clinicians: illustrated review of medical literature." NEMESIS 11, no. 1 (2020): 1–29. http://dx.doi.org/10.14428/nemesis.v11i1.54393.

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Objective: to explain the meaning and to illustrate technical artifacts (aliasing as well as the ring artifact) and beam hardening (metal artifact) that can be present in the dentomaxillofacial cone beam computed tomography (CBCT), and to check the accessibility of free illustrations of these artifacts in medical publications. Material and methods: One observer applied five search equations using database PubMed. The exclusion criteria were: experimental studies, animal studies, studies not related to dentomaxillofacial area, and articles with closed access. There was no time limit for t

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Carlson, Eric S. "Representation and Structure Conflict in the Digital Age." Advances in Archaeological Practice 2, no. 4 (2014): 269–84. http://dx.doi.org/10.7183/2326-3768.2.4.269.

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AbstractDigital imaging technologies have enhanced archaeological research and profoundly expanded the scale of the discipline’s potentialities. As illustrators and archaeologists move away from using hand-drawn images (of hand-held, real-life objects) to depict artifacts and other archaeological information, certain capabilities of the traditional illustrative process are lost. One such loss is the ability to present a complete and informed representation of an artifact free of the distortions and visual limitations that single-perspective (i.e., digital or photographic) imagery produces. Thi

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Lundholm, Ida V., Jonas A. Sellberg, Tomas Ekeberg, et al. "Considerations for three-dimensional image reconstruction from experimental data in coherent diffractive imaging." IUCrJ 5, no. 5 (2018): 531–41. http://dx.doi.org/10.1107/s2052252518010047.

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Diffraction before destruction using X-ray free-electron lasers (XFELs) has the potential to determine radiation-damage-free structures without the need for crystallization. This article presents the three-dimensional reconstruction of the Melbournevirus from single-particle X-ray diffraction patterns collected at the LINAC Coherent Light Source (LCLS) as well as reconstructions from simulated data exploring the consequences of different kinds of experimental sources of noise. The reconstruction from experimental data suffers from a strong artifact in the center of the particle. This could be

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Babcock, Michael A., William H. Levis, and Amar B. Bhatt. "Mirror Image Video Artifact: An Under-Reported Digital Video-EEG Artifact." Neurodiagnostic Journal 57, no. 2 (2017): 147–52. http://dx.doi.org/10.1080/21646821.2017.1314742.

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Mihmanli, Ismail, Serap Cetinkaya, Sebuh Kurugoglu, Fatih Kantarci, and Gul Esen. "Another face of mirror-image artifact." European Journal of Ultrasound 14, no. 2-3 (2001): 183–85. http://dx.doi.org/10.1016/s0929-8266(01)00161-6.

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Kim, Sung Hun. "Image Quality and Artifact of ABUS." Ultrasound in Medicine & Biology 43 (2017): S13. http://dx.doi.org/10.1016/j.ultrasmedbio.2017.08.979.

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Giachetti, A., and N. Asuni. "Real-Time Artifact-Free Image Upscaling." IEEE Transactions on Image Processing 20, no. 10 (2011): 2760–68. http://dx.doi.org/10.1109/tip.2011.2136352.

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Ramadevi, G. "Real Time Artifact-Free Image Upscaling." IOSR Journal of Electronics and Communication Engineering 3, no. 1 (2012): 12–19. http://dx.doi.org/10.9790/2834-0311219.

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