Three-dimensional array of scintillation crystals with proper reflector arrangement for a depth of interaction detector

A new method to acquire four-layer depth of interaction (DOI) information is proposed for the next generation positron emission tomography scanner (jPET-D4) that realizes high resolution and high sensitivity. The detector module of the jPET-D4 is a 16/spl times/16/spl times/4 Gd/sub 2/SiO/sub 5/: Ce...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2005-02, Vol.52 (1), p.8-14
Main Authors: Orita, N., Murayama, H., Kawai, H., Inadama, N., Tsuda, T.
Format: Article
Language:English
Subjects:
Arrays
Colonies
Crystals
Depth of interaction (DOI)
Detectors
Encoding
Histograms
nuclear medicine
Photomultipliers
Position measurement
Position sensitive particle detectors
Positron emission tomography
positron emission tomography (PET)
Reflectors
Scintillation
scintillation detector
Sensor arrays
Solid scintillation detectors
Two dimensional displays
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Summary:A new method to acquire four-layer depth of interaction (DOI) information is proposed for the next generation positron emission tomography scanner (jPET-D4) that realizes high resolution and high sensitivity. The detector module of the jPET-D4 is a 16/spl times/16/spl times/4 Gd/sub 2/SiO/sub 5/: Ce (GSO) multicrystal array coupled with a 256 ch flat panel position sensitive photomultiplier tube (256 ch FP-PMT) having large opening area. The first challenge to encode DOI information was carried out with 8/spl times/8 array of units consisted of 2/spl times/2/spl times/4 crystal elements. The unit is developed for four-layer DOI encoding in previous report. Its crystal identification performance is evaluated by uniform gamma ray irradiation. The measured scintillation events are mapped on a two-dimensional (2-D) position histogram according to the relative ratio of the multianode output of the FP-PMT. However, peaks corresponding to the crystal elements of one unit form a colony in the resultant 2-D position histogram and there is large space between adjacent colonies. In the new method, the reflector arrangement which makes proper light sharing in the multicrystal array decreases such wasted space. Consequently, peak-to-valley on the 2-D position histogram was improved to 3.3:1 from 1.8:1. We found energy performance was also enhanced by the new method.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2004.843158