Preliminary study of depth of interaction measurement for a PET detector

LIAO Yan-Fei; ZHANG Zhi-Ming; LI Dao-Wu; SHUAI Lei; SHAN Bao-Ci; HUANG Xian-Chao; LIU Jun-Hui; CHEN Yan; WANG Ying-Jie; LIU Shuang-Quan; WANG Pei-Lin; WEI Shu-Jun; WEI Long

doi:10.1088/1674-1137/35/11/017

Chinese Physics C> 2011, Vol. 35> Issue(11) : 1070-1073 DOI: 10.1088/1674-1137/35/11/017

Preliminary study of depth of interaction measurement for a PET detector

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Abstract：
In this work we studied the feasibility of detecting the depth of interaction (DOI) with two layers of crystal arrays of LYSO and BGO scintillators coupled to a position-sensitive photomultiplier tube (PS-PMT) R8900-C12. A front-end electronics was designed, with which we got different pulse shapes for different crystals to obtain depth information. With the double integration method, we got the DOI histogram of a divided integration ratio of two crystals as the standard to determine the layer-of-interaction. The DOI accuracy, measured by scanning a ²²Na slit source along the side of the module, was 98% for the LYSO layer and 95% for the BGO layer. The energy resolution at 511keV was 13.1% for LYSO and 17.1% for BGO. We obtained good crystal separation in 2D position histograms of both layers. These results could be useful in the manufacture of PET scanners with high spatial resolutions.

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LIAO Yan-Fei, ZHANG Zhi-Ming, LI Dao-Wu, SHUAI Lei, SHAN Bao-Ci, HUANG Xian-Chao, LIU Jun-Hui, CHEN Yan, WANG Ying-Jie, LIU Shuang-Quan, WANG Pei-Lin, WEI Shu-Jun and WEI Long. Preliminary study of depth of interaction measurement for a PET detector[J]. Chinese Physics C, 2011, 35(11): 1070-1073. doi: 10.1088/1674-1137/35/11/017

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Received: 2011-01-24
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Preliminary study of depth of interaction measurement for a PET detector

Received Date: 2011-01-24

Accepted Date: 2011-03-02

Available Online: 2011-11-05

Abstract: In this work we studied the feasibility of detecting the depth of interaction (DOI) with two layers of crystal arrays of LYSO and BGO scintillators coupled to a position-sensitive photomultiplier tube (PS-PMT) R8900-C12. A front-end electronics was designed, with which we got different pulse shapes for different crystals to obtain depth information. With the double integration method, we got the DOI histogram of a divided integration ratio of two crystals as the standard to determine the layer-of-interaction. The DOI accuracy, measured by scanning a ²²Na slit source along the side of the module, was 98% for the LYSO layer and 95% for the BGO layer. The energy resolution at 511keV was 13.1% for LYSO and 17.1% for BGO. We obtained good crystal separation in 2D position histograms of both layers. These results could be useful in the manufacture of PET scanners with high spatial resolutions.

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Preliminary study of depth of interaction measurement for a PET detector

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