25 April 2000 Compact gamma-ray probe for breast imaging based on a 5-inch PSPMT and a single NaI crystal scintillator
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Abstract
Scintimammography is a promising technique for breast cancer detection. Scintimammography uses radiotracer containing 99mTc that emits 140 keV gamma photons. We developed a small field of view gamma ray imaging probe called IRIS. A possible application of this probe is scintimammography. IRIS is composed by a single NaI(Tl) scintillator coupled to a 5 inch round PSPMT. In order to optimize compromise between resolution and detection efficiency, we developed a Monte Carlo code modeling light transport in NaI crystals. The thickness of the scintillator (4 mm) was optimized for 99mTc imaging. We also designed a high-resolution collimator with a 35 mm thickness and 1.7 mm hole diameter. Detection efficiency of the crystal is 65% at 140 keV. IRIS shows a 2.5 mm global spatial resolution in contact. Energy and spatial corrections allow a +/- 5% uniformity and an energy resolution better than 10% at 140 keV. IRIS has a 10 cm field of view and a 13 cm external diameter at the entrance face. The small size of the detector head allows placing the detector close to the breast, improving global spatial resolution. The high-resolution gamma ray imaging probe IRIS shows physical characteristics well suited for 99mTc breast imaging.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Laurent Fagot, Laurent Fagot, Michel Parmentier, Michel Parmentier, Annie Pousse, Annie Pousse, Christophe Dornier, Christophe Dornier, Bruno Kastler, Bruno Kastler, "Compact gamma-ray probe for breast imaging based on a 5-inch PSPMT and a single NaI crystal scintillator", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384497; https://doi.org/10.1117/12.384497
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