NDLI: PET resolution and image quality optimization study for different detector block geometries and DOI designs

Content Provider	IEEE Xplore Digital Library
Author	Yuxuan Zhang Wai-Hoi Wong Shitao Liu Jiguo Liu Soonseok Kim Baghaei, H. Hongdi Li Ramirez, R. Yu Wang
Copyright Year	2007
Description	Author affiliation: Univ. of Texas M. D. Anderson Cancer Center, Houston (Yuxuan Zhang; Wai-Hoi Wong; Shitao Liu; Jiguo Liu)
Abstract	Detector geometry for PET camera is one of the most important factors that will determine the resolution and image quality of the camera. In this work, the point source resolutions and hot-rod phantom images of the PET systems with different detector geometries are studied using Monte Carlo simulations. The PET systems been studied include a human brain PET and an animal PET with the typical detector ring dimensions but different crystal sizes, number of layers and block geometries. The detector ring diameter is 480 mm for the brain PET and 160 mm for the animal PET. The blocks been studied include 1-layer and 2-layer geometries. Two types of 2- layer blocks are studied, one has a half-crystal-offset (HCO) between the top and bottom layers to double the radial and axial samplings, and the other one is the regular (non-HCO) 2-layer block. The blocks in the brain PET is 40times40times20 $mm^{3}$ and with a crystal matrix of 10times10, 13times13 and 15times15; the block in the animal PET is 20times20times10 $mm^{3}$ and with a crystal matrix of 10times10, 12times12 and 14times14. Point source resolution curves (radial, tangential and axial) as the function of off-center distance are obtained with an F-18 source. Two Derenzo-like hot-rod phantoms are used for overall image quality test. The results show the significant improvement on the DOI effect with 2-layer block especially in the radial direction. Using the HCO block, the transaxial resolution is a little better than that of non-HCO block in the center region of the FOV but become worse with some distance from the center because of the sampling rates in different radial offset positions are not the same for these two types of blocks. Another important finding is that the axial resolution with HCO block is much better than that from 1- layer or 2-layer non-HCO block. Therefore using HCO block with larger crystal pitch can still achieve better image quality not only in transaxial plane at the outside region of a large FOV compare to the small crystal pitch with 1-layer block, but also better resolution in axial direction without additional cost, which might be a better choice for high-resolution PET camera design.
Starting Page	2885
Ending Page	2888
File Size	454319
Page Count	4
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4436737
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	Positron emission tomography Image resolution Image quality Design optimization Detectors Geometry Cameras Animals Imaging phantoms Sampling methods
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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