A discrete scintillation camera module using silicon photodiode readout of CsI(Tl) crystals for breast cancer imaging
- Lawrence Berkeley National Lab., CA (United States)
The authors characterize a 3 x 4 element imaging array consisting of 3 x 3 x 5 mm{sup 3} CsI(Tl) scintillator crystals individually read out by 3 x 3 mm{sup 2} PIN silicon photodiodes. The array is a prototype for larger modules for use in single photon breast cancer imaging. The photodiode output signals are amplified with a 16 channel custom IC (< 3 mm on a side), after which a ``Winner Take All`` (WTA) custom IC identifies the crystal of interaction based on relative signal amplitudes. The compact nature of these readout electronics will simplify the construction of larger imaging arrays. The photodiodes were developed for low leakage current ({approximately} 50 pA) and yield a total electronic noise of 390 e- full width at half maximum (fwhm) at a shaping time of 8 {micro}s, with signal levels of 6,600 e- for the 140 keV emissions of {sup 99m}Tc. Array pixels demonstrate an average room temperature energy resolution of 10.7 {+-} 0.6% fwhm for these 140 keV gamma rays. The authors observe an intrinsic spatial resolution of 3.3 mm fwhm for a 2.5 mm diameter {sup 57}Co beam on the face of the crystal array, and a system resolution of 5.9 mm fwhm for a 2 mm diameter uncollimated {sup 99m}Tc source viewed through a high resolution hexagonal hole collimator at an imaging distance of 5 cm.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); California Univ., Berkeley, CA (United States); Fannie and John Hertz Foundation (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 649388
- Report Number(s):
- CONF-971147--
- Journal Information:
- IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 3Pt2 Vol. 45; ISSN IETNAE; ISSN 0018-9499
- Country of Publication:
- United States
- Language:
- English
Similar Records
High resolution CsI(Tl)/Si-PIN detector development for breast imaging
Design studies for a PET detector module using a PIN photodiode to measure depth of interaction