3 May 2002 Determination of imaging performance of a photostimulable phosphor system for digital mammography
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Abstract
Quantitative analysis of a prototype photostimulable phosphor system for digital mammography was performed. The pre-sampled MTF, noise power spectrum (NPS), noise equivalent quanta (NEQ), and detective quantum efficiency (DQE) were measured at 26 and 32 kVp to assess the imaging performance of a commercial computed radiography system dedicated for mammographic imaging. The pre-sampled MTF demonstrated 5 percent modulation at 8 lp/mm with a small dependence on kVp, and noise power estimates indicated x-ray quantum-limited spectral characteristics from 2 mR up to approximately 30 mR incident exposure. Maintenance of x-ray information content up to approximately 500,000 quanta/mm2 based upon NEQ measurements was demonstrated. DQE (0 mm-1) was 30-50 percent, DQE (2.5 mm-1) was 15-25 percent, and DQE (4 mm-1) was 5-15 percent, depending on kVp, incident exposure, and readout direction. A significant increase in DQE compared to previous CR mammography implementations was found. In addition to the quantitative measurements, qualitative experience suggests that CR mammography is essentially equivalent to state-of-the-art mammography screen-film detector systems.
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James Anthony Seibert, John M. Boone, Virgil N. Cooper, "Determination of imaging performance of a photostimulable phosphor system for digital mammography", Proc. SPIE 4682, Medical Imaging 2002: Physics of Medical Imaging, (3 May 2002); doi: 10.1117/12.465588; https://doi.org/10.1117/12.465588
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