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Backscatter factors in the mammographic energy range
Medical Physics
|September 1, 1977
Summary
Backscatter factors were measured for mammographic X-ray beams. Results show field-size dependence is less pronounced at lower half-value layers compared to previous studies.
Area of Science:
- Medical Physics
- Radiological Physics
Background:
- Accurate dosimetry in mammography requires understanding backscatter factors.
- Mammographic X-ray beams have specific kilovoltage peak (kVp) and half-value layer (HVL) characteristics.
Purpose of the Study:
- To determine backscatter factors for mammographic beams.
- To investigate the influence of beam diameter and HVL on backscatter factors.
Main Methods:
- Utilized thin TLD-100 chips as detectors.
- Measured dose with and without a scattering medium to quantify backscatter.
Main Results:
- Backscatter factors were determined as a function of beam diameter and HVL.
- Field-size dependence of backscatter factors was less than previously reported for lower HVLs.
Conclusions:
- The study provides updated backscatter factor data for mammography.
- Findings suggest a reduced field-size effect at lower HVLs, impacting dosimetry calculations.