On the measurement of half‐value layer in film–screen mammography
Copyright policy )On the measurement of half‐value layer in film–screen mammography
Sources of variations in the measurement of half‐value layer (HVL) in film–screen mammography are evaluated. Two principal sources are the energy responses of ionization chambers and the elemental compositions of the 1100 aluminum‐alloy attenuation materials. Methods in measuring the thickness of attenuation materials are also an important potential source of error. These factors as well as the influence of geometry of measurement, position of measurement in the field, and precision of radiation output are examined. Recommendations for consistency in measurement are provided.
- Baylor College of Medicine United States
- The University of Texas at Austin United States
- Center for Devices and Radiological Health United States
- United States Food and Drug Administration United States
Data Interpretation, Statistical, Biophysics, Humans, Female, Biophysical Phenomena, Mammography
Data Interpretation, Statistical, Biophysics, Humans, Female, Biophysical Phenomena, Mammography
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