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% 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 ∼30 mR incident exposure. Maintenance of x-ray information content up to ∼500,000 quanta/mm 2 based upon NEQ measurements was demonstrated. DQE (0 mm -1) was 30-50%, DQE (2.5 mm -1) was 15-25%, and DQE (4 mm -1) was 5-15%, 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 mannnography screen-film detector systems.
Original language | English (US) |
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Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
Editors | L.E. Antonuk, M.J. Yaffe |
Pages | 447-456 |
Number of pages | 10 |
Volume | 4682 |
DOIs | |
State | Published - 2002 |
Event | Medical Imaging 2002: Physics of Medical Imaging - San Diego, CA, United States Duration: Feb 24 2002 → Feb 26 2002 |
Other
Other | Medical Imaging 2002: Physics of Medical Imaging |
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Country/Territory | United States |
City | San Diego, CA |
Period | 2/24/02 → 2/26/02 |
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics