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High resolution CsI(Tl)/Si-PIN detector development for breast imaging

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6 Author(s)
Patt, B.E. ; Photon Imaging Inc., Northridge, CA, USA ; Iwanczyk, J.S. ; Rossington Tull, C. ; Wang, N.W.
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High resolution multi-element (8×8) imaging arrays with collimators, size matched to discrete CsI(TI) scintillator arrays and Si-PIN photodetector arrays (PDA's) were developed as prototypes for larger arrays for breast imaging. Photodetector pixels were each 1.5×1.5 mm2 with 0.25 mm gaps. A 16-element quadrant of the detector was evaluated with a segmented CsI(TI) scintillator array (1.5×1.5×6 mm3 segments with 0.25 mm septa) coupled to the silicon array. The scintillator thickness of 6 mm corresponds to >85% total gamma efficiency at 140 keV. Pixel energy resolution of <8% FWHM was obtained for Tc-99m (140 keV). Electronic noise was 41 e- RMS corresponding to a 3% FWHM contribution to the 140 keV photopeak. Detection efficiency uniformity (±σ%) measured with a Tc-99m flood source was 4.3% for a ~10% energy photopeak window. Spatial resolution was 1.53 mm FWHM and pitch was 1.75 mm as measured from the Co-57 (122 keV) line spread function. Signal to background was 34 and contrast ([max-min]/[max+min]) was 0.94. The energy resolution and spatial characteristics of the new imaging detector exceed those of other scintillator based imaging detectors. A camera based on this technology will allow: (1) Improved Compton scatter rejection; (2) Detector positioning in close proximity to the breast to increase signal to noise; (3) Improved spatial resolution; and (4) Improved efficiency compared to high resolution collimated gamma cameras for the anticipated compressed breast geometries

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Nuclear Science, IEEE Transactions on  (Volume:45 ,  Issue: 4 )