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Proceedings Paper

Compact gamma-ray probe for breast imaging based on a 5-inch PSPMT and a single NaI crystal scintillator
Author(s): Laurent Fagot; Michel Parmentier; Annie Pousse; Christophe Dornier; Bruno Kastler
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Paper 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.

Paper Details

Date Published: 25 April 2000
PDF: 8 pages
Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); doi: 10.1117/12.384497
Show Author Affiliations
Laurent Fagot, Univ. de Franche-Comte (France)
Michel Parmentier, Univ. de Franche-Comte (France)
Annie Pousse, Univ. de Franche-Comte (France)
Christophe Dornier, Univ. de Franche-Comte (France)
Bruno Kastler, Univ. de Franche-Comte (France)

Published in SPIE Proceedings Vol. 3977:
Medical Imaging 2000: Physics of Medical Imaging
James T. Dobbins III; John M. Boone, Editor(s)

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