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New light-amplifier-based detector designs for high spatial resolution and high sensitivity CBCT mammography and
Stephen Rudin1, Andrew T Kuhls, Girijesh K Yadava
1University at Buffalo (State University of New York), Toshiba Stroke Research Center, 3435 Main St. Buffalo, NY USA 14214.
Proceedings of Spie--The International Society for Optical Engineering
|September 28, 2011
Summary
New detector designs for cone-beam computed tomographic (CBCT) mammography offer high resolution and sensitivity. These systems, utilizing light amplifiers or electron multiplying CCDs, promise improved imaging performance over existing flat-panel detectors.
Area of Science:
- Medical Imaging
- Detector Physics
Background:
- Cone-beam computed tomographic (CBCT) mammography requires high-performance detectors for improved diagnostic accuracy.
- Existing detector technologies face limitations in spatial resolution, sensitivity, and noise performance.
Purpose of the Study:
- To present novel cone-beam computed tomographic (CBCT) mammography system designs utilizing advanced x-ray detectors.
- To compare the performance of systems based on light amplifiers (LAs) and electron multiplying CCDs (EMCCDs).
Main Methods:
- Development of x-ray detectors comprising a phosphor coupled to a fiber-optic taper, leading to either a light amplifier (LA) and CCD camera or an electron multiplying CCD (EMCCD).
- Utilizing square arrays of detectors to achieve a field-of-view (FOV) up to 20 × 20 cm with 100 µm pixel resolution.
- Acquiring images at 30 frames per second (fps) with quantum-limited performance and analyzing detector dynamic range through flexible voltage-controlled gain.
Main Results:
- Achieved high spatial resolution, sensitivity, low noise, wide dynamic range, and high frame rates suitable for advanced mammography and fluoroscopy.
- Demonstrated quantum-limited performance below 0.2 µR detector exposure per frame for practical scan times.
- Identified designs with sufficient information carriers to avoid a quantum sink, indicating high efficiency.
Conclusions:
- New LA- or EMCCD-based detector systems offer significantly improved performance for CBCT mammography, region-of-interest CT (ROI-CT), and fluoroscopy.
- These advanced detectors represent a substantial upgrade compared to current flat-panel detector systems.
- The proposed designs pave the way for next-generation medical imaging systems with enhanced capabilities.
