Experimental results from the C-SPRINT prototype Compton camera

Journal Article · Tue Jun 01 04:00:00 EDT 1999 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/23.775514· OSTI ID:679555

LeBlanc, J W; Clinthorne, N H; Hua, C H; Rogers, W L; Wehe, D K; Wilderman, S J ^[1]; Nygard, E ^[2]; Weilhammer, P ^[3]

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1. Univ. of Michigan, Ann Arbor, MI (United States)
2. IDE AS, Oslo (Norway)
3. CERN, Geneva (Switzerland)

A Compton camera is being tested for nuclear medicine applications. The design uses a single 3 cm by 3 cm silicon pad detector as the first detector system, and SPRINT, an array of position-sensitive sodium iodide modules, /as the second detector. Experimental results with a {sup 99m}Tc point source show coincidence energy spectra agreeing with theoretical predictions. The coincidence energy spectra for both silicon and SPRINT detectors correspond to the geometry-determined scattering angle range. Recorded energy falls outside of strict geometric limits because of Doppler broadening and detector energy resolution effects. The summed energy peak in the initial data run for a {sup 99m}Tc source has a FWHM energy resolution of 33 keV, primarily due to energy uncertainty in the SPRINT modules. A second data run showed an improvement to 25 keV in summed energy resolution due to careful calibration of, and correction for, significant first and second detector gain nonuniformities. Images generated from the second acquired data set result in a backprojection image resolution of 1.5 cm at a source distance of 10 cm. Analytical and Monte Carlo calculations show a very close agreement of 1.6 cm. Using a list-mode maximum likelihood EM reconstruction algorithm, the image resolution is improved to 7 mm, although the resolution recovery is at the expense of increased noise in the image.

• OSTI ID: 679555
• Report Number(s): CONF-981110--
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt1 Vol. 46; ISSN IETNAE; ISSN 0018-9499
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
55 BIOLOGY AND MEDICINE
BASIC STUDIES
DESIGN
ENERGY RESOLUTION
ENERGY SPECTRA
GAMMA CAMERAS
NAI DETECTORS
NUCLEAR MEDICINE
POSITION SENSITIVE DETECTORS
SI SEMICONDUCTOR DETECTORS