NDLI: Ultra fast 3D incremental backprojection for parallel beam geometries

Content Provider	IEEE Xplore Digital Library
Author	Hong, I.K. Cho, Z.H.
Copyright Year	2007
Description	Author affiliation: Korea Polytech. Univ., Siheung (Hong, I.K.)
Abstract	For high resolution PET reconstruction, iterative reconstruction methods, such as OSEM, are widely used. They give relatively good image quality, however reconstruction time is very long. Their reconstruction time prevents daily clinical usage for dynamic (multi-frame) studies. In the iterative EM reconstruction method, Projection and Backprojection are major time consuming parts. Previously the authors presented a new SSP method which improved reconstruction time by orders of magnitude. We developed a new backprojection method by using the incremental concept for 3D Backprojection of parallel beam projection data. In this abstract, we will present the methods for implementing the new incremental concept in 3D Backprojection, and criteria for limitation of Backprojection time. The total number of calculations could be reduced by 3 times in the case of HRRT Backprojector with new incremental algorithm. However, this improvement only reduces processing time by 30%. In the backprojection process, the two main parts can be identified as calculation and saving the calculated result to DRAM. Part of calculation is performed inside of the CPU which is an order of magnitude faster than DRAM access. The most time consuming part was calculation before SSP or the new incremental method were introduced, however, now it has become memory access time to save result. For HRRT reconstruction, ROI parts of the image are 38 MB. This ROI part should be accessed 144 times as number of half view number (when symmetry properties is applied), and 6 times per each view for rotating and adding it back to final image. Total amount of memory access is 38 MB times 144 times 6 = 32 GB. However, most of the current computer system has about 5 GB/sec memory bandwidth which makes memory access time 32/5 = 6.4 sec. This memory access time is almost the same as backprojection time. To overcome this memory bandwidth bottleneck problem, the cluster system should be considered for dynamic studies.
Starting Page	3452
Ending Page	3453
File Size	364523
Page Count	2
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4436872
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Geometry Image reconstruction Iterative methods Reconstruction algorithms Random access memory Bandwidth Nuclear and plasma sciences Particle beams Positron emission tomography Image quality
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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