title: Evaluation of organ doses and effective dose according to the ICRP Publication 110 reference male/female phantom and the modified ImPACT CT patient dosimetry.
abstract: We modified the Imaging Performance Assessment of CT scanners (ImPACT) to evaluate the organ doses and the effective dose based on the International Commission on Radiological Protection (ICRP) Publication 110 reference male/female phantom with the Aquilion ONE ViSION Edition scanner. To select the new CT scanner, the measurement results of the CTDI100,c and CTDI100,p for the 160 (head) and the 320 (body) mm polymethylmethacrylate phantoms, respectively, were entered on the Excel worksheet. To compute the organ doses and effective dose of the ICRP reference male/female phantom, the conversion factors obtained by comparison between the organ doses of different types of phantom were applied. The organ doses and the effective dose were almost identical for the ICRP reference male/female and modified ImPACT. The results of this study showed that, with the dose assessment of the ImPACT, the difference in sex influences only testes and ovaries. Because the MIRD-5 phantom represents a partially hermaphrodite adult, the phantom has the dimensions of the male reference man including testes, ovaries, and uterus but no female breasts, whereas the ICRP male/female phantom includes whole-body male and female anatomies based on high-resolution anatomical datasets. The conversion factors can be used to estimate the doses of a male and a female accurately, and efficient dose assessment can be performed with the modified ImPACT.
authors.affiliation: Department of Radiology, Fujita Health University Hospital, Tokoake, Japan; Kanazawa University, Graduate School of Medical Sciences, Division of Medical Sciences, Kanazawa, Japan. masa1121@fujita-hu.ac.jp.
authors.forename: Masanao
authors.initials: M
authors.lastname: Kobayashi
authors.forename: Yasuki
authors.initials: Y
authors.lastname: Asada
authors.forename: Kosuke
authors.initials: K
authors.lastname: Matsubara
authors.forename: Yuta
authors.initials: Y
authors.lastname: Matsunaga
authors.forename: Ai
authors.initials: A
authors.lastname: Kawaguchi
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Katada
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Toyama
authors.forename: Kichiro
authors.initials: K
authors.lastname: Koshida
authors.forename: Shouichi
authors.initials: S
authors.lastname: Suzuki
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D038622:Internationality; D008297:Male; D008954:Models, Biological; D009928:Organ Specificity; D019047:Phantoms, Imaging / Q000592:standards*; D012016:Reference Values; D012062:Relative Biological Effectiveness; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000592:standards*; D014915:Whole-Body Counting / Q000295:instrumentation / Q000379:methods* / Q000592:standards*