title: Calibration coefficients of dosimeters used in mammography for various target/filter combinations.
abstract: 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.
authors.affiliation: University of Tsukuba. sekimoto.m.ff@u.tsukuba.ac.jp.
authors.forename: Michiharu
authors.initials: M
authors.lastname: Sekimoto
authors.forename: Yoh
authors.initials: Y
authors.lastname: Katoh
authors.forename: Tsuguhisa
authors.initials: T
authors.lastname: Katoh
mesh_terms: D002138:Calibration / Q000592:standards; D004867:Equipment Design; D005260:Female; D006801:Humans; D008327:Mammography / Q000295:instrumentation* / Q000592:standards / Q000706:statistics & numerical data; D011829:Radiation Dosage; D011874:Radiometry / Q000295:instrumentation* / Q000592:standards / Q000706:statistics & numerical data; D012666:Semiconductors; D014965:X-Rays