Physical measurements of heavy metal filter performance
- 1 March 1985
- journal article
- Published by Wiley in Medical Physics
- Vol. 12 (2) , 225-228
- https://doi.org/10.1118/1.595709
Abstract
Contrast, relative tube loading, and relative entrance exposure have been measured for a number of heavy metal filters (Gd, Ho, Yb, and W) at several filter thicknesses, tube voltages (70-100 kV), and phantom thicknesses (1.5-2.5 cm of aluminum). The rare-earth filters consistently gave higher contrast (relative to water) for air, CaCl2, iodine, and oil than the standard 2 mm of added aluminum, at a given tube voltage. It was found that the best filter choices gave a constant product of relative exposure and relative tube loading.Keywords
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