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Physical measurements of heavy metal filter performance
Author(s) -
Burgess A. E.
Publication year - 1985
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595709
Subject(s) - materials science , tube (container) , imaging phantom , filter (signal processing) , aluminium , iodine , voltage , relative standard deviation , optics , composite material , chemistry , metallurgy , physics , electrical engineering , chromatography , quantum mechanics , detection limit , engineering
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, CaCl 2 , 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.