DocumentCode :
3535343
Title :
A DOI PET detector having extended X´tal cube structure
Author :
Inadama, Naoko ; Mitsuhashi, Takayuki ; Murayama, Hideo ; Nishikido, Fumihiko ; Yoshida, Eiji ; Tashima, Hideaki ; Suga, Mikio ; Watanabe, Mitsuo ; Yamaya, Taiga
Author_Institution :
Nat. Inst. of Radiol. Sci., Chiba, Japan
fYear :
2010
fDate :
Oct. 30 2010-Nov. 6 2010
Firstpage :
3346
Lastpage :
3348
Abstract :
We developed a new PET depth-of-interaction (DOI) detector in which the scintillation crystal array is extended in one direction. It can be utilized as a PET detector having, for instance, long axial direction. The detector has the "crystal cube (X\´tal cube)" structure and the extension was enabled by the feature of the X\´tal cube that some MPPCs are always placed close to an originating position of the scintillation photons. X\´tal cube is a DOI PET detector we have developed and it can provide isotropic spatial resolution. X\´tal cube consists of a scintillation crystal block segmented into cubes and multi-pixel photon counters (MPPCs). A number of MPPCs are coupled on all six sides of the crystal block to detect scintillation photons near their originating position. In a preliminary experiment previously carried out, we confirmed sufficient detector performance of X\´tal cube using a prototype composed of a 6 × 6 × 6 array of Lu2SGd2(1-S)SiO5:Ce (LGSO, x=0.9) crystals with dimensions of 3.0 × 3.0 × 3.0 mm and MPPCs of 3.0 × 3.0 mm active area. In this study, the crystal block was extended in one direction from 6 crystals to 14 crystals. The results of performance evaluation proved that the 6 × 6 × 14 crystals could be identified with the structure. Although MPPCs were coupled on all sides of the crystal block in the extended X\´tal cube, at the central part, the detected radiation position would be calculated with mainly the signals of close MPPCs on the four surfaces. That means the detector can be long as considered appropriate for a system while keeping the isotropic spatial resolution.
Keywords :
biomedical materials; biomedical optical imaging; cerium; gadolinium compounds; image segmentation; lutetium compounds; medical image processing; performance evaluation; photons; positron emission tomography; scintillation; Lu2xGd2(1-x)SiO5:Ce; PET depth-of-interaction detector; detected radiation position; extended crystal cube structure; isotropic spatial resolution; long axial direction; multipixel photon counters; performance evaluation; scintillation crystal array; scintillation crystal block segmention; scintillation photons; Arrays; Crystals; Detectors; Histograms; Photonic crystals; Photonics; Positron emission tomography;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Nuclear Science Symposium Conference Record (NSS/MIC), 2010 IEEE
Conference_Location :
Knoxville, TN
ISSN :
1095-7863
Print_ISBN :
978-1-4244-9106-3
Type :
conf
DOI :
10.1109/NSSMIC.2010.5874425
Filename :
5874425
Link To Document :
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