Open AccessCalibration coefficients of dosimeters used in mammography for various target/filter combinations
Author(s) -
Sekimoto Michiharu,
Katoh Yoh,
Katoh Tsuguhisa
Publication year - 2015
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1120/jacmp.v16i6.5604
Subject(s) - dosimeter , calibration , filter (signal processing) , ionization chamber , mammography , materials science , energy (signal processing) , optics , medical physics , nuclear medicine , computer science , physics , ionization , mathematics , radiation , medicine , statistics , computer vision , quantum mechanics , cancer , breast cancer , ion
A wide variety of existing combinations of target and filter materials (target/filter combinations) are used in mammography equipment. The patient dose depends on the X‐ray quality that is derived from the target/filter combination, and a calibration of the dosimeter that is used in the measurement that corresponds to the specific target/filter combination is necessary. However, dosimeters in mammography are generally calibrated with reference to the X‐ray quality of Mo/Mo or W/Al combinations, and it is unclear whether or not the X‐ray quality that is derived from other target/filter combinations will affect the calibration coefficients. In this paper, the calibration coefficients of different dosimeters were evaluated for target/filter combinations. For an ionization chamber‐type dosimeter, good energy dependence was found and the effect of the target/filter combination was small. However, for a semiconductor dosimeter, a large energy dependence was found, and different calibration coefficients that depended on the target/filter combination used were required. PACS number: 87.59.E‐