NDLI: 4D reconstruction for wide cone-angle medical CT

Content Provider	IEEE Xplore Digital Library
Author	Kachelriess, M. Knaup, M. Kalender, W.
Copyright Year	2004
Description	Author affiliation: Inst. of Med. Phys., Erlangen-Nurnberg Univ., Erlangen, Germany (Kachelriess, M.; Knaup, M.; Kalender, W.)
Abstract	Medical CT aims at faster rotation speeds and a higher number of simultaneously acquired slices. These efforts are pushed further by cardiac CT (4D reconstruction) which is currently the most prominent special-purpose application in CT. Currently, 16-slice scanners and rotation times of below 0.5 s are state of the art. Scanners with far more slices have already been announced. Among those developments are prototypes with up to 256 slices. The basic requirements for image reconstruction are the support of circular, sequence and spiral scans. Arbitrary pitch selection is of high importance. Further, the complete area of the detector is to be exposed and each measured ray should contribute to the image to achieve optimized dose usage. Only approximate reconstruction approaches have the potential to handle all these requirements. Currently, the only known phase-correlated true cone-beam approach is an extension to the advanced single-slice rebinning (ASSR) algorithm. However, this generalized approach ASSR CI is limited to 32 slices. We have therefore developed a new approximate Feldkamp-type algorithm, the extended parallel backprojection (EPBP). Its main features are a phase-weighted backprojection and a voxel-by-voxel 180/spl deg/ normalization. The first feature ensures 3D and 4D capabilities with one and the same algorithm, the second ensures 100% detector usage (each ray counts!). The algorithm is evaluated using simulated circular, sequential and spiral data of a thorax phantom and of a cardiac motion phantom and measured patient data for scanners with up to 256 slices. The standard reconstructions (EPBP Std) are of excellent quality even for as many as 256 slices regardless of the scan trajectory. The cardiac reconstructions (EPBP CI) are of high quality as well and show no significant deterioration of objects even far off the center of rotation. Since EPBP CI uses the cardio interpolation (CI) phase weighting the temporal resolution is equivalent to that of the well known single-slice and multi-slice cardiac approaches 180/spl deg/CI, 180/spl deg/MCI, and ASSR CI, respectively, and lies in the order of 50 ms to 100 ms for rotation times between 0.375 s and 0.5 s.
Starting Page	3248
Ending Page	3252
File Size	1153014
Page Count	5
File Format	PDF
ISBN	0780382579
ISSN	10823654
DOI	10.1109/NSSMIC.2003.1352590
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image reconstruction Computed tomography Biomedical imaging Spirals Detectors Imaging phantoms Prototypes Area measurement Thorax Motion measurement
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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