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X-ray imaging with amorphous selenium: optimal spectra for digital mammography
R Fahrig1, J A Rowlands, M J Yaffe
1Department of Medical Biophysics, University of Toronto, Ontario, Canada.
Medical Physics
|April 1, 1996
Summary
This study investigates optimal X-ray spectra for digital mammography using amorphous selenium (a-Se) detectors. Results show molybdenum target spectra and current mammographic kilovoltage settings are suitable for a-Se digital readout.
Area of Science:
- Medical Physics
- Radiological Imaging
Background:
- Digital mammography utilizes amorphous selenium (a-Se) photoconductors for image acquisition.
- Image readout from a-Se plates employs laser discharge or flat panel recharge methods.
Purpose of the Study:
- To determine the optimal X-ray spectra for digital mammographic imaging with a-Se detectors.
- To evaluate the influence of various factors on spectrum optimization for different readout methods.
Main Methods:
- Utilized a breast model adapted for phosphor-based systems, extended for photoconductor specifics.
- Investigated effects of plate thickness, X-ray scatter, readout noise, dose, and breast tissue type.
- Explored two readout methods: laser discharge and flat panel recharge.
Main Results:
- Identified optimal X-ray spectra for a-Se digital readout.
- Found that molybdenum target spectra and current mammographic kilovoltage settings are appropriate.
- This contrasts with higher kilovoltages used for xerographic readout.
Conclusions:
- Molybdenum target spectra are effective for digital mammography with a-Se detectors.
- Current mammographic kilovoltage ranges are suitable for a-Se digital readout systems.
- Findings differ from traditional xerographic readout requirements for a-Se.