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An amorphous selenium based positron emission mammography camera with avalanche gain
A Reznik1, B J M Lui, J A Rowlands
1Department of Medical Biophysics, Sunnybrook and Women's College Health Sciences Centre, Imaging Research, University of Toronto, Toronto, Ontario M4N 3M5, Canada. reznik@sten.sunnybrook.utoronto.ca
Technology in Cancer Research & Treatment
|January 15, 2005
Summary
A new Positron Emission Mammography (PEM) system offers improved breast cancer detection. This advanced imaging technology utilizes amorphous selenium and LSO for higher sensitivity and spatial resolution, aiding early diagnosis.
Area of Science:
- Medical Imaging
- Nuclear Medicine
- Biophysics
Background:
- Early breast cancer diagnosis is critical for treatment success.
- X-ray mammography, the current standard, has limitations in detection ability and specificity.
- Positron Emission Tomography (PET) with FDG offers metabolic information but lacks spatial resolution for small lesions.
Purpose of the Study:
- To propose and demonstrate the feasibility of a novel Positron Emission Mammography (PEM) imaging system.
- To enhance radiotracer signal collection efficiency and improve spatial resolution for breast lesion detection.
- To enable visualization of smaller breast cancer lesions than currently possible with whole-body PET.
Main Methods:
- Development of a compact, dual-head PEM camera.
- Utilizing amorphous selenium (a-Se) avalanche photodetectors for high quantum efficiency and rapid response.
- Employing lutetium oxyorthosilicate (LSO) scintillators for fast decay time and high light yield.
- Characterizing the gain and readout time of an 8 microm a-Se layer.
Main Results:
- Demonstrated high collection efficiency by combining LSO and a-Se properties.
- Measured the gain and readout time of the a-Se layer, confirming its suitability.
- Established the feasibility of the proposed PEM camera design.
Conclusions:
- The proposed PEM system maintains FDG PET's specificity while offering improved sensitivity and spatial resolution.
- This technology has the potential to detect significantly smaller breast cancer lesions.
- The developed PEM camera shows promise for advancing early breast cancer diagnosis.