Improvement of light coupling in BGO detector module by optimization of the crystal shape

Author

Hilal, S.K. ; Ro, Y.M. ; Mun, C.W. ; Kim, Y.S. ; Cho, Z.H.

Author_Institution

Dept. of Radiol., Columbia Univ., New York, NY, USA

Volume

36

Issue

1

fYear

1989

fDate

2/1/1989 12:00:00 AM

Firstpage

1043

Lastpage

1046

Abstract

A detector shape optimization study was carried out for the high-resolution 4×4 array BGO-PMT (bismuth-germanate-photomultiplier-tube) coupling scheme to be used in the spherical positron emission tomograph. To improve the light collection efficiency in the BGO detector array, the authors used bullet-nose-shaped BGO crystal at both the front- and the back-side of the detector, the latter being coupled to the PMT´s photocathode. It was hypothesized that the smooth, round front-side bullet-nose shape, by eliminating the sharp corners of the crystal, would improve the light collection efficiency and that the bullet-nose shape at the back-side of crystal, coupled to the PMT, would provide optimal coupling between the crystal and the PMT by the focusing property of the bullet-nose shape. Computer simulations and experimental studies were carried out, confirming these suppositions

Keywords

biomedical equipment; bismuth compounds; computerised tomography; digital simulation; photocathodes; photodetectors; physics computing; radioisotope scanning and imaging; Bi₁₂GeO₂₀; PET; bullet-nose-shaped BGO crystal; detector shape optimization study; focusing property; light collection efficiency; optimal coupling; photocathode; positron emission tomography; spherical positron emission tomograph; Cathodes; Computer simulation; Nose; Optical arrays; Optical coupling; Photonic crystals; Positron emission tomography; Sensor arrays; Shape; Solid scintillation detectors;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.34602

Filename

34602