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- W1976681818 abstract "The spatial resolution of a NaI(T1), 25 mm thick bar detector designed for use in positron emission tomography has been studied. The position along the 500 mm long detector is determined from the centroid of the light distribution in the crystal as measured by a linear array of photomultiplier tubes. A Monte Carlo computer simulation was performed to investigate the factors limiting the spatial resolution. The program allowed us to study the effect of various phototube configurations and crystal surfaces. Since the resolution is affected by the width of the light distribution, we studied the effect of sharpening the distribution by modifying the front crystal surface with grooves cut perpendicular to the long axis of the crystal and by using non-linear preamplifiers. The simulation predicts a spatial resolution (FWHM) of 3 mm with this crystal. Experimental measurements of spatial resolution were performed concurrently with the simulations. In particular, a modified grooved crystal was measured to have 4.0 mm spatial resolution, an improvement over the original crystal without grooves. With delay line pulse shortening, which increases the count rate capability of the detector, the grooved crystal was measured to have 5.5 mm spatial resolution." @default.
- W1976681818 created "2016-06-24" @default.
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- W1976681818 date "1985-07-01" @default.
- W1976681818 modified "2023-10-18" @default.
- W1976681818 title "Performance of a position-sensitive scintillation detector" @default.
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- W1976681818 doi "https://doi.org/10.1088/0031-9155/30/7/003" @default.
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