CERN Accelerating science

Article
Report number	CERN-EP-2001-009
Title	Silicon detector for a Compton Camera in Nuclear Medical Imaging
Author(s)	Meier, D ; Czermak, A ; Jalocha, P ; Sowicki, B ; Kowal, M ; Dulinski, W ; Maehlum, G ; Nygård, E ; Yoshioka, K ; Fuster, J A ; Lacasta, C ; Mikuz, M ; Roe, S ; Weilhammer, Peter ; Hua, C H ; Park, S J ; Wilderman, S J ; Zhang, L ; Clinthorne, N H ; Rogers, W L
Affiliation	(Medical School, Univ. Michigan, Ann Arbor) ; (Niewodniczanski Inst. Nucl. Phys. Krakow) ; (Univ. Mining and Metallurgy, Krakow) ; (LEPSI, IN2P3/CNRS-ULP, Strasbourg) ; (Ideas ASA, Oslo) ; (Univ. Valencia) ; (Univ. Ljubljana) ; (CERN) ; (Coll. Eng., Univ. Michigan, Ann Arbor)
Publication	2001
Imprint	29 Jan 2001
Number of pages	6
In:	47th IEEE Nuclear Science Symposium and Medical Imaging Conference, Lyons, France, 15 - 20 Oct 2000, pp.22/6-10 (v.3)
DOI	10.1109/TNS.2002.1039568
Subject category	Detectors and Experimental Techniques
Abstract	Electronically collimated gamma ca\-me\-ras based on Com\-pton scattering in silicon pad sensors may improve imaging in nuclear medicine and bio-medical research. The work described here concentrates on the silicon pad detector developed for a prototype Compton camera. The silicon pad sensors are read out using low noise VLSI CMOS chips and novel fast triggering chips. Depending on the application a light weight and dense packaging of sensors and its readout electronics on a hybrid is required. We describe the silicon pad sensor and their readout with the newly designed hybrid. %The silicon detector of a Compton camera %may contain up to $10^5$ analogue channels requiring %a fast and low cost data acquisition system. We also describe a modular and low-cost data acquisition system (CCDAQ) based on a digital signal processor which is interfaced to the EPP port of personal computers. Using the CCDAQ and the hybrids energy spectra of gamma-ray photons from technetium ($^{\rm 99m}_{43}$Tc) and americium ($^{241}_{95}$Am) were acquired with an energy resolution of 2.45 keV FWHM for the 140.5 keV photo-absorption line of $^{\rm 99m}_{43}$Tc. For all pads the discrimination threshold in the trigger chip was between (15 and 25) keV.

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