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Relevant bibliographies by topics / Helical scan

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Academic literature on the topic 'Helical scan'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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Journal articles on the topic "Helical scan"

1

Tsujioka, Katsumi, Hirofumi Anno, Kazuhiro Katada, Yoshihiro Ida, and Takeshi Sawada. "188. Basic Study of Subtraction Helical Scan with Fast CT : Sequential Subtraction Helical Scan." Japanese Journal of Radiological Technology 47, no. 8 (1991): 1221. http://dx.doi.org/10.6009/jjrt.kj00003323930.

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Lingaiah, Ramaa, Md Abbas Ali, Ummay Kulsum, Muhtasim Aziz Muneem, Karthick Raj Mani, Sharif Ahmed, Md Shakilur Rahman, and M. Salahuddin. "GTV volume estimation using different mode of computer tomography for lung tumors in stereotactic body radiation therapy." Polish Journal of Medical Physics and Engineering 25, no. 1 (March 1, 2019): 29–34. http://dx.doi.org/10.2478/pjmpe-2019-0005.

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Abstract Aim: To estimate the Gross Tumor Volume (GTV) using different modes (axial, helical, slow, KV-CBCT & 4D-CT) of computed tomography (CT) in pulmonary tumors. Materials & Methods: We have retrospectively included ten previously treated case of carcinoma of primary lung or metastatic lung using Stereotactic Body Radiation Therapy (SBRT) in this study. All the patients underwent 4 modes of CT scan Axial, Helical, Slow & 4D-CT using GE discovery 16 Slice PET-CT scanner and daily KV-CBCT for the daily treatment verification. For standardization, all the patients underwent different modes of scan using 2.5 mm slice thickness, 16 detectors rows and field of view of 400mm. Slow CT was performed using axial mode scan by increasing the CT tube rotation time (typically 3 – 4 sec.) as per the breathing period of the patients. 4D-CT scans were performed and the entire respiratory cycle was divided into ten phases. Maximum Intensity Projections (MIP), Minimum Intensity Projections (MinIP) and Average Intensity Projections (AvIP) were derived from the 10 phases. GTV volumes were delineated for all the patients in all the scanning modes (GTVAX - Axial, GTVHL - Helical, GTVSL – Slow, GTVMIP -4DCT and GTVCB – KV-CBCT) in the Eclipse treatment planning system version 11.0 (M/S Varian Medical System, USA). GTV volumes were measured, documented and compared with the different modes of CT scans. Results: The mean ± standard deviation (range) for MIP, slow, axial, helical & CBCT were 36.5 ± 40.5 (2.29 – 87.0), 35.38 ± 39.52 (2.1 – 82), 31.95 ± 37.29 (1.32 – 66.9), 28.98 ± 33.36 (1.01 – 65.9) & 37.16 ± 42.23 (2.29 – 92). Overall underestimation of helical scan and axial scan compared to MIP is 21% and 12.5%. CBCT and slow CT volume has a good correlation with the MIP volume. Conclusion: For SBRT in lung tumors better to avoid axial and helical scan for target delineation. MIP is a still a golden standard for the ITV delineation, but in the absence of 4DCT scanner, Slow CT and KV-CBCT data may be considered for ITV delineation with caution.

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3

Constanta-Fanourakis, P., K. Kaczar, G. Oleynik, D. Petravick, M. Votava, V. White, G. Hockney, S. Bracker, and J. M. de Miranda. "Exabyte helical scan devices at Fermilab." IEEE Transactions on Nuclear Science 36, no. 5 (1989): 1696–700. http://dx.doi.org/10.1109/23.41131.

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4

TSUJIOKA, KATSUMI, YOSHIHIRO IDA, HIRONORI OHTSUBO, YASUKATA TAKAHASHI, and MASAYOSHI NIWA. "Concept and Development of Measurement Method of Time Sensitivity profile (TSP) in X-ray CT : Comparison of Non-helical, Single-slice Helical, and Multi-slice Helical Scans." Japanese Journal of Radiological Technology 56, no. 12 (2000): 1461–69. http://dx.doi.org/10.6009/jjrt.kj00003110936.

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5

Tang, Xiangyang, Jiang Hsieh, Roy A. Nilsen, and Scott M. McOlash. "Extending Three-Dimensional Weighted Cone Beam Filtered Backprojection (CB-FBP) Algorithm for Image Reconstruction in Volumetric CT at Low Helical Pitches." International Journal of Biomedical Imaging 2006 (2006): 1–8. http://dx.doi.org/10.1155/ijbi/2006/45942.

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A three-dimensional (3D) weighted helical cone beam filtered backprojection (CB-FBP) algorithm (namely, original 3D weighted helical CB-FBP algorithm) has already been proposed to reconstruct images from the projection data acquired along a helical trajectory in angular ranges up to[0,2π]. However, an overscan is usually employed in the clinic to reconstruct tomographic images with superior noise characteristics at the most challenging anatomic structures, such as head and spine, extremity imaging, and CT angiography as well. To obtain the most achievable noise characteristics or dose efficiency in a helical overscan, we extended the 3D weighted helical CB-FBP algorithm to handle helical pitches that are smaller than1:1(namely extended 3D weighted helical CB-FBP algorithm). By decomposing a helical over scan with an angular range of[0,2π+Δβ]into a union of full scans corresponding to an angular range of[0,2π], the extended 3D weighted function is a summation of all 3D weighting functions corresponding to each full scan. An experimental evaluation shows that the extended 3D weighted helical CB-FBP algorithm can improve noise characteristics or dose efficiency of the 3D weighted helical CB-FBP algorithm at a helical pitch smaller than1:1, while its reconstruction accuracy and computational efficiency are maintained. It is believed that, such an efficient CB reconstruction algorithm that can provide superior noise characteristics or dose efficiency at low helical pitches may find its extensive applications in CT medical imaging.

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6

Hu, Xiao-Yu, Jun Ouyang, Guo-Chang Liu, Meng-Juan Gao, Lai-Bo Song, Jianfeng Zang, and Wei Chen. "Synthesis and Characterization of the Conducting Polymer Micro-Helix Based on the Spirulina Template." Polymers 10, no. 8 (August 7, 2018): 882. http://dx.doi.org/10.3390/polym10080882.

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As one of the most interesting naturally-occurring geometries, micro-helical structures have attracted attention due to their potential applications in fabricating biomedical and microelectronic devices. Conventional processing techniques for manufacturing micro-helices are likely to be limited in cost and mass-productivity, while Spirulina, which shows natural fine micro-helical forms, can be easily mass-reproduced at an extremely low cost. Furthermore, considering the extensive utility of conducting polymers, it is intriguing to synthesize conducting polymer micro-helices. In this study, PPy (polypyrrole), PANI (polyaniline), and PEDOT (poly(3,4-ethylenedioxythiophene)) micro-helices were fabricated using Spirulinaplatensis as a bio-template. The successful formations of the conducting polymer micro-helix were confirmed using scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) and Raman and X-ray diffraction (XRD) were employed to characterize the molecular structures of the conducting polymer in micro-helical forms. In the electrochemical characterization, the optimized specific capacitances for the PPy micro-helix, the PANI micro-helix, and the PEDOT micro-helix were found to be 234 F/g, 238 F/g at the scan rate of 5 mV/s, and 106.4 F/g at the scan rate of 10 mV/s, respectively. Therefore, it could be expected that other conducting polymer micro-helices with Spirulina as a bio-template could be also easily synthesized for various applications.

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7

NAKANISHI, Akihito, Yasunobu NAKO, Miho KOHDA, Eichi INOUE, Hiroshi TAKEUCHI, Naomoto MATSUMOTO, Kuninori KOBAYASHI, and Hiromi ITOH. "36. Usefulness of Helical scan in larynx." Japanese Journal of Radiological Technology 50, no. 2 (1994): 155. http://dx.doi.org/10.6009/jjrt.kj00003534518.

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8

Osaki, Hiroyuki, and Tetsuo Endo. "Tribology of helical scan tape drive systems." Tribology International 38, no. 6-7 (June 2005): 616–24. http://dx.doi.org/10.1016/j.triboint.2005.01.010.

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9

Hoshino, Susumu, Masashi Ohtani, Masayuki Sekiguchi, Katsuhiro Hanmura, Kyouji Higashimura, Kouzou Hanai, Takashi Tanaka, and Mitsuhiro Anan. "182. Performance evaluation of helical scan CT." Japanese Journal of Radiological Technology 47, no. 8 (1991): 1215. http://dx.doi.org/10.6009/jjrt.kj00003323924.

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10

Ozue, T., T. Shirai, Y. Kamatani, H. Kano, Y. Ikeda, S. Onodera, and T. Kawana. "Magnetoresistive heads for helical-scan tape systems." IEEE Transactions on Magnetics 35, no. 2 (March 1999): 729–33. http://dx.doi.org/10.1109/20.750636.

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Dissertations / Theses on the topic "Helical scan"

1

Mori, Yoshine, Shigeki Itoh, Mitsuru Ikeda, Akiko Sawaki, Koujiro Suzuki, Shingo Iwano, Hiroko Satake, Shoji Arahata, Toyohiro Ota, and Takeo Ishigaki. "Application of Subsecond Rotation Scan to Helical CT for Lung Cancer Screening." Nagoya University School of Medicine, 2006. http://hdl.handle.net/2237/6908.

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2

Mason, Terry. "ADVANCES IN WIDEBAND VHS CASSETTE RECORDING." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/608887.

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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California
In recent years, many designers have turned to digital techniques as a means of improving the fidelity of instrumentation data recorders. However, single and multi-channel recorders based on professional VHS transports are now available which use innovative methods for achieving near-perfect timebase accuracy, inter-channel timing and group delay specifications for long-duration wideband analog recording applications. This paper discusses some of the interesting technical problems involved and demonstrates that VHS cassette recorders are now a convenient and low cost proposition for high precision multi-channel wideband data recording.

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3

Fievre, Michaël. "Conception et validation technologique de têtes intégrées d’écriture multipistes pour l’enregistrement hélicoïdal sur bande." Grenoble INPG, 2002. http://www.theses.fr/2002INPG0167.

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Les techniques de stockage de l’information ont connu un essor important avec l’avènement de l’informatique et de toutes les activités multimédia. L’enregistrement hélicoïdal sur bande, qui reste le média le plus économique est destiné à stocker de très importants volumes d’information. Le nombre de têtes d’écriture/lecture utilisées par ce type d’enregistreurs augmente pour améliorer les taux de transfert. Le problème du positionnement entre les têtes devient donc central. La technologie de fabrication des têtes pour l’enregistrement hélicoïdal proposé par la société Alditech qui est entièrement intégrée sur silicium constitue le point de départ du travail présenté ici. En effet, l’objectif est de réaliser une tête double en s’affranchissant des problèmes de positionnement des têtes entre elles grâce aux technologies importées de la microélectronique. La démarche qui a amené à proposer la structure du composant est présentée ici. La faisabilité de cette structure est ensuite validée par l’étude de briques de base technologiques et la réalisation d’un premier démonstrateur. Par ailleurs les perturbations du fonctionnement magnétique des têtes introduites par l’utilisation d’une technologie têtes doubles ainsi que les phénomènes de diaphonie entre les têtes sont étudiés par simulation numériques
The data storage techniques knew an important development due to the success of the multimedia activities. Helical recording on tape, that remains the most economical media, is used for the very important data volumes. The number of read/write heads used by this type of recorders increases to improve the transfer rates. Thus the problem of the relative heads positioning becomes central. The manufacture technology of helical recording heads proposed by Alditech is fully integrated on silicon wafers. It constitutes the departure point of the work presented here. The purpose is to build a double head suppressing the positioning problems of heads thanks to the imported technologies of the microelectronic. The gait that brought to propose the structure of the component is presented here. Next the feasibility of this structure is validated by the study of basic technological steps and the realization of the first demonstrator. Besides the perturbations of the magnetic function of the heads introduced by the “double head” technology as well as the crossfeed phenomena between the heads are studied by numerical simulations

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4

Ricker, William, and John Jr Kolb. "A HIGH-SPEED, RUGGEDIZED, MINIATURE INSTRUMENTATION RECORDER UTILIZING COMMERCIAL TECHNOLOGY." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/608915.

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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California
Due to the vast amount of data required to be collected for design/performance analysis of operational and development systems, there has evolved a real requirement for a high-speed, large capacity, data collection/record system in a small Flight/Ruggedized package. This need is realized by several user communities and factors which include the evolution of small operational vehicles (airborne, land and UAV’s), the desire of weapons manufacturers/integrators to be independent from the vehicle during vehicle integration, and a general need for a field/airborne, reliable portable data collection system for intelligence gathering, operational performance verification and on-board data processing. In the Air Defence community, the need for a ruggedized record system was highlighted after Desert Storm, in which the operational performance of the Patriot Missile was questioned and data collection was not performed to support the performance. The Aydin Vector Division in conjunction with the prime contractor, has come up with a solution to this problem which utilizes a commercially available helical scan 8mm data storage unit. This solution provides a highly reliable record system, ruggedized for airborne and field environments and a low price in comparison with the more traditional approaches currently offered. This paper will describe the design implementation of this small ruggedized, flight worthy Data collection system deemed the ATD-800. It will also discuss the performance and limitations of implementing such a system, as well as provide several applications and solutions to different operational environments to be encountered. Additionally, the paper will conclude with several product enhancements which may benefit the flight test, operational and intelligence communities in the future.

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5

Anoop, K. P. "Truncated Data Problems In Helical Cone-Beam Tomography." Thesis, 2008. http://hdl.handle.net/2005/766.

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This report delves into two of the major truncated data problems in helical cone-beam tomography: Axial truncation and Lateral truncation. The problem of axial truncation, also classically known as the Long Object problem, was a major challenge in the development of helical scan tomography. Generalization of the Feldkamp method (FDK) for circular scan to the helical scan trajectory was known to give reasonable solutions to the problem. The FDK methods are approximate in nature and hence provide only approximate solution to the long object problem. Recently, many methods which provide exact solution to this problem have been developed the major breakthrough being the Katsevich’s algorithm which is exact, efficient and also requires lesser detector area compared to Feldkamp methods. The first part of the report deals with the implementation strategies for methods capable of handling axial truncation. Here, we specifically look at the exact and efficient Katsevich’s solution to long object problem and the class of approximate solutions provided by the generalized FDK formulae. The later half of the report looks at the lateral truncation problem and suggests new methods to handle such truncation in helical scan CT. Simulation results for reconstruction with laterally truncated projection data, assuming it to be complete, gives severe artifacts which even penetrates into the field of view (FOV). A row-by-row data completion approach using Linear Prediction is introduced for helical scan truncated data. An extension/improvement of this technique known as Windowed Linear Prediction approach is introduced. Efficacy of both these techniques are shown using simulation with standard phantoms. Various image quality measures for the resulting reconstructed images are used to evaluate the performance of the proposed methods against an already existing technique. Motivated by a study of the autocorrelation and partial autocorrelation functions of the projection data the use of a non-stationary linear model, the ARIMA model, is proposed for data completion. The new model is first validated in the 2D truncated data situation. Also a method of incorporating the parallel beam data consistency condition into this new method is considered. Performance evaluation of the new method with consistency condition shows that it can outperform the existing techniques. Simulation experiments show the efficacy of the ARIMA model for data completion in 2D as well as 3D truncated data scenario. The model is shown to work well for the laterally truncated helical cone-beam case.

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6

Tsai, I.-Jung, and 蔡依蓉. "Improving the Image Quality in 256-slice CT coronary Angiography (CTCA) in Retrospective ECG-triggered Helical Scans: Feasibility Study of a Semi-empirical Formula." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/09149793379818636631.

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碩士
中臺科技大學
醫學影像暨放射科學系暨研究所
103
Purpose: Explore the correlation among scanning parameters (clinical protocols), which were BMI, tube current, reconstruction kernels and reconstruction algorithm to optimize imaging quality in coronary CT angiography. Methods: 30 consecutive patients with suspected CAD were undergone retrospective ECG-triggered CTCA using standard dose protocol within 2014/Jan-June. The raw data were reconstructed using the reconstruction kernels XCB and XCC. The reconstruction algorithm was adopted as either reconstruction Filter back projection or iterative reconstruction. The BMI, tube current, reconstruction kernels and reconstruction algorithm were detected and their correlations to noise were evaluated using a semi-empirical formula. The formula was developed to provide index in optimizing the tube current. Furthermore, an additional 30 consecutive patients were scanned with the index-based tube current adjustment. Differences in patient characteristics and image acquisition parameters were compared between the 2 groups by using the independent t test. Results: Linear regression implied r² = 0.50, and 0.67 for Group A, and B; the image noise of Group A, B was 12.4± 1.3; 12.4± 0.67, p<0.05; SNR in Group A, B was 36.2± 7, 39.7±6, p>0.05; CNR in Group A, B was27± 6, 30±4.8, p>0.05. Conclusion: The semi-empirical formula as obtained herein optimized effectively for imaging quality in 256-slice CT coronary angiography.

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Books on the topic "Helical scan"

1

Bellis, F. A. An experimental helical scan DVTR. London: BBC, 1986.

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2

Hawthorne, Christopher R. J. Error control for a helical-scan magnetic data storage system. Ottawa: National Library of Canada, 1990.

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3

Elizer, Lee H. Helical scan tape market strategy report: DDAT (RDAT), 8MM, VHS. Santa Barbara, CA (5266 Hollister Ave., Suite 123, Santa Barbara 93111): Peripheral Strategies, 1987.

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4

Chan, Wing Chi Stephen. An experimental test set for digital magnetic recording using helical scan machine. Manchester: University of Manchester, 1994.

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5

Commission, International Electrotechnical. Helical-scan video tape cassette system using 8 mm magnetic tape-Video 8. Geneva: International Electrotechnical Commission, 1987.

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6

Goddard Space Flight Center specification for helical-scan 8-millimeter (mm) magnetic digital data tape cartridge. Greenbelt, MD: National Aeronautics and Space Administration, Goddard Space Flight Center, 1992.

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Book chapters on the topic "Helical scan"

1

Cubitt, Sean. "Videography: The Helical Scan." In Videography, 3–18. London: Macmillan Education UK, 1993. http://dx.doi.org/10.1007/978-1-349-23099-0_1.

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2

Cuevas, L. M., P. M. Spieth, A. R. Carvalho, M. G. de Abreu, and E. Koch. "Automatic Lung Segmentation of Helical-CT Scans in Experimental Induced Lung Injury." In IFMBE Proceedings, 764–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89208-3_183.

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3

Suzuki, K., T. Uematsu, and T. Nakagawa. "High Efficiency Finish Grinding by Helical Scan Grinding Method." In Advancement of Intelligent Production, 327–32. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-81901-7.50068-2.

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4

"Technical principles of cardiovascular CT." In Cardiovascular Computed Tomography, edited by James Stirrup, Russell Bull, Michelle Williams, and Ed Nicol, 19–34. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780198809272.003.0003.

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This chapter covers the technical mechanisms by which CT scanners work. X-ray tube voltage is explained, and the effects of changing voltage on radiation exposure and the resultant CT image are defined. Scan pitch for both single- and multi-slice CT have their formulae given, and the effects of changing pitch are described. Both spatial and temporal resolution are discussed, and multi-segment reconstruction concepts are explained. ECG gating, including retrospective and prospective gating are covered. Finally, axial and helical scanning acquisition modes are described.

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Conference papers on the topic "Helical scan"

1

Kaaden and Albertini. "Thin-film Heads For Helical Scan Recording." In 1998 International Conference on Consumer Electronics. IEEE, 1997. http://dx.doi.org/10.1109/icce.1997.625869.

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2

Jeonghoon Jeong, Dongweon Yoon, Jubyung Lee, and Sunghwan Choi. "Blind reconstruction of a helical scan interleaver." In 2011 8th International Conference on Information, Communications & Signal Processing (ICICS 2011). IEEE, 2011. http://dx.doi.org/10.1109/icics.2011.6174276.

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Douros, Kostas, Gerasimos Kremmydas, Vasilis Grammeniatis, Marios Papadopoulos, Michael Anthracopoulos, Efi Alexopoulou, and Kostas Priftis. "Helical CT scan to diagnose tracheomalacia in children." In Annual Congress 2015. European Respiratory Society, 2015. http://dx.doi.org/10.1183/13993003.congress-2015.pa1345.

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4

Muftu, S., and R. C. Benson. "Numerical Simulation Of Tape Dynamics In Helical-scan Recording." In 1993 Digests of International Magnetics Conference. IEEE, 1993. http://dx.doi.org/10.1109/intmag.1993.642653.

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Bin, Li, Li Baolei, Mo Yang, and Zhang Yaojun. "Pseudo-Three-Dimensional Navigation in Helical Scan Security Inspection." In 2013 Seventh International Conference on Image and Graphics (ICIG). IEEE, 2013. http://dx.doi.org/10.1109/icig.2013.168.

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6

Oehme, W. F. "Investigation and modelling of helical scan tape recorder noise." In International Conference on Storage and Recording Systems. IEE, 1994. http://dx.doi.org/10.1049/cp:19941135.

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7

Lee, Seung Wook, and Ge Wang. "Grangeat-type helical half-scan reconstruction of a long object." In Optical Science and Technology, the SPIE 49th Annual Meeting, edited by Ulrich Bonse. SPIE, 2004. http://dx.doi.org/10.1117/12.560409.

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Obernosterer, F., W. F. Oehme, and R. Plankenbuhler. "Helical Scan Tape Recording With MLSE At 3600 Bit/mm." In 1993 Digests of International Magnetics Conference. IEEE, 1993. http://dx.doi.org/10.1109/intmag.1993.642695.

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Nagai, N., T. Shirai, S. Fukuda, S. Onodera, and T. Ozue. "A narrower side erase band for use with helical scan tape systems." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837506.

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10

Tang, Xiangyang, Jiang Hsieh, John L. Seamans, Fang Dong, and Darin Okerlund. "Cardiac imaging in diagnostic VCT using multi-sector data acquisition and image reconstruction: step-and-shoot scan vs. helical scan." In Medical Imaging, edited by Jiang Hsieh and Ehsan Samei. SPIE, 2008. http://dx.doi.org/10.1117/12.769908.

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