NDLI: Wave length shifter strips and G-APD arrays for the read-out of the z-coordinate in axial PET modules

Content Provider	IEEE Xplore Digital Library
Author	Braem, A. Chesi, E. Joram, C. Rudge, A. Seguinot, J. Weilhammer, P. De Leo, R. Nappi, E. Lustermann, W. Schinzel, D. Johnson, I. Renker, D. Albrecht, S.
Copyright Year	2007
Description	Author affiliation: CERN, Geneva (Braem, A.; Chesi, E.; Joram, C.; Rudge, A.; Seguinot, J.; Weilhammer, P.)
Abstract	The measurements presented in this paper are related to the development of a PET camera based on a 3D axial geometry with excellent 3-dimensional spatial, timing and energy resolution. The detector modules under development consist of matrices of long axially oriented scintillation crystal bars, which are individually coupled to photodetectors. The axial coordinate is derived from Wave Length Shifting (WLS) plastic strips orthogonally interleaved between the crystal bars and readout by G-APD arrays. We report on results from measurements with two LYSO crystal bars, read with PMTs, and two WLS strips readout with G-APD devices from Hamamatsu (called MPPC). The WLS strips are positioned orthogonally underneath the LYSO bars. Yields of about 80 photoelectrons from the WLS strips for an energy deposition in the LYSO crystals equivalent to the absorption of 511 keV photons are observed. The axial coordinate in the LYSO bars is reconstructed with a precision of about 1.9 mm (FWHM) using a digital reconstruction method. This resolution is still compromised by the availability of only two WLS strips and will improve with a full stack of LYSO crystals interleaved with WLS strip arrays, which is presently under development for a PET demonstrator set-up.
Starting Page	2601
Ending Page	2606
File Size	278259
Page Count	6
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4436681
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 Bars Photonic crystals Energy resolution Energy measurement Cameras Geometry Timing Solid scintillation detectors Photodetectors
Content Type	Text
Resource Type	Article

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