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

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5 Author(s)
Hilal, S.K. ; Dept. of Radiol., Columbia Univ., New York, NY, USA ; Ro, Y.M. ; Mun, C.W. ; Kim, Y.S.
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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

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Nuclear Science, IEEE Transactions on  (Volume:36 ,  Issue: 1 )