NDLI: Helical-Path, Half-Cone-Beam Acquisition for SPECT Brain Imaging

Content Provider	IEEE Xplore Digital Library
Author	Jaszczak, R.J. Greer, K.L. Bowsher, J.E. Metzler, S.D. Ter-Antonyan, R. Bobkov, K.V.
Copyright Year	2006
Description	Author affiliation: Dept. of Radiol., Duke Univ. Med. Center, Durham, NC (Jaszczak, R.J.; Greer, K.L.; Bowsher, J.E.; Metzler, S.D.; Ter-Antonyan, R.; Bobkov, K.V.)
Abstract	Convergent beam collimation can provide improved sensitivity and/or spatial resolution for single photon emission computed tomography (SPECT) brain imaging. A half-cone-beam (HCB) collimator is particularly useful because shoulder interference is mitigated and the base of the brain is within the collimator's field of view. However, HCB SPECT acquisitions using a single circular orbit (SCO) result in insufficiently sampled projection data and consequently axial distortion. To reduce axial-distortion artifacts, we investigated HCB acquisitions using helical paths (HPs). A single HCB collimator with the focal point shifted towards the base of the brain was mounted on a Triad-XLT SPECT system. HP-HCB SPECT was evaluated with a Hoffman 3D brain phantom and a Defrise-type disk phantom. While the camera revolved in a 360 deg. circular orbit, the bed and phantom were translated at a slow speed. This combined motion resulted in a helical path of the focal point relative to the phantom. Two HP acquisitions, each with 360 deg. rotation, were combined to provide a single 720 deg. HP acquisition. An Ordered-Subset, Expectation-Maximization reconstruction algorithm was used. The HCB-HP SPECT images were compared with full-cone-beam (FCB) SCO, HCB-SCO SPECT, and parallel beam (PB) images. The FCB-SCO and HCB-SCO images of the disk phantom demonstrated strong axial artifacts. These artifacts were eliminated in HCB-HP images. HCB-HP SPECT provides markedly improved sampling of SPECT data than is possible with FCB-SCO and HCB-SCO SPECT, and offers the potential for improved SPECT imaging of the human brain.
Starting Page	1837
Ending Page	1841
File Size	870943
Page Count	5
File Format	PDF
ISBN	1424405602
ISSN	10957863
DOI	10.1109/NSSMIC.2006.354251
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Brain Imaging phantoms Optical collimators Spatial resolution Single photon emission computed tomography Interference Cameras Reconstruction algorithms Image sampling Humans
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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