NDLI: A miniature SPECT using multi-pinhole collimator with vertical septa

Content Provider	IEEE Xplore Digital Library
Author	Byung Jun Min Yong Choi Nam-Yong Lee Jin Ho Jung Key Jo Hong Ji Hoon Kang Wei Hu Kisung Lee Young Bok Ahn Jinhun Joung
Copyright Year	2009
Description	Author affiliation: School of Computer Aided Science, Institute of Basic Sciences, Inje University, Gimhae, Gyungnam, 621-749, Korea (Nam-Yong Lee) \|\| Department of Nuclear Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, 135-710, Korea (Byung Jun Min; Yong Choi; Jin Ho Jung; Key Jo Hong; Ji Hoon Kang; Wei Hu) \|\| Department of Radiologic Science, Korea University, Seoul, 136-703, Korea (Kisung Lee) \|\| Molecular Imaging, Siemens Medical Solutions USA, Inc., Hoffman Estates, IL 60195, USA (Jinhun Joung) \|\| Department of Electronic Engineering, Kon-Kuk University, Seoul, 143-701, Korea (Young Bok Ahn)
Abstract	We had previously reported a simulation study on a multi-pinhole collimator (MP) having lead vertical septa which could provide improved angular sampling and enlarged imaging field of view (FOV) compared to low energy high resolution parallel-hole collimator (LEHR) using same size detector. The aim of this study was to develop a miniature SPECT to verify the performance of the proposed MP. A detector having 70 mm × 70 mm active area was consisted of a 6 mm thick NaI(Tl) crystal coupled to a 127 mm diameter position-sensitive photomultiplier tube (PSPMT). A 7×7 pinhole collimator with 2 mm diameter pinhole and 40 mm focal length was fabricated to evaluate the performance compared to a typical LEHR. Additionally, a detector having 50 mm × 50 mm active area with 5×5 pinhole collimator and LEHR was investigated to evaluate enlarged imaging FOV. Planar spatial resolution, sensitivity, and resolution hot- and cold-rod phantom images were acquired. Images were reconstructed by the use of a dedicated MLEM algorithm with an unmatched projector/backprojector pair. Spatial resolution and sensitivity were 4.7 mm FWHM and 0.25 cps/μCi at 60 mm distance, respectively. Although the detector size was smaller than the phantom size, MP allowed to image entire phantom images while LEHR provided the images with truncation artifact. The reconstructed images using 60 and 30 projections with both 7×7 pinhole collimator and LEHR showed a similar quality image to the image using 120 projections. However, the reconstructed images with 10 projections using 7×7 pinhole collimator showed better quality than those with LEHR. The reconstructed images using the MP provided high quality images with enlarged imaging FOV even when insufficient angular sampling data were used which would be useful to develop a stationary SPECT.
Starting Page	3116
Ending Page	3120
File Size	438928
Page Count	5
File Format	PDF
ISBN	9781424439614
ISSN	10957863
DOI	10.1109/NSSMIC.2009.5401679
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-10-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Collimators Image reconstruction Spatial resolution Imaging phantoms Image resolution Sampling methods High-resolution imaging Energy resolution Position sensitive particle detectors Photomultipliers
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
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