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Microcontrolled pyro-electric instrument for measuring X-ray intensity in mammography
M H de Paula1, A A de Carvalho, A L Brassalotti
1Department of Physics, Federal University of Mato Grosso do Sul, Brazil.
Medical & Biological Engineering & Computing
|April 6, 2006
Summary
A new instrument uses a pyro-electric detector to accurately measure low X-ray intensity in mammography. This device precisely quantifies radiation levels, even in challenging clinical settings.
Area of Science:
- Medical Physics
- Instrumentation Science
Background:
- Mammography X-ray intensity measurement is challenging due to low photon energy and intensity.
- Existing instruments may struggle with the specific requirements of mammography radiation detection.
Purpose of the Study:
- To develop and evaluate a novel instrument for accurate X-ray intensity measurement in mammography.
- To assess the instrument's performance in clinical environments and under radiation exposure.
Main Methods:
- Utilized a pyro-electric detector based on ferro-electric crystals (lithium tantalate and lithium niobate).
- Integrated a high-sensitivity current-to-voltage converter, microcontroller, and digital display.
- Tested the instrument's sensitivity, precision, and stability in simulated and clinical mammography conditions.
Main Results:
- The instrument accurately measures X-ray intensities as low as 0.25 mW m⁻² with >99% precision.
- Performance remained high despite significant electromagnetic interference and vibration in a clinical setting.
- The pyro-electric detector showed no degradation after exposure to 140 roentgen of radiation.
Conclusions:
- The novel pyro-electric instrument is suitable for precise X-ray intensity measurement in mammography.
- It demonstrates robustness and reliability for use in demanding clinical environments.
- This technology offers a promising advancement for mammography quality assurance and research.