title: [Assessment of the exposure dose value displayed on operator console in a computed tomography system deciding exposure dose from positioning image].
abstract: The aim of this study was to assess the exposure dose value (DLP) displayed on the operator console in a computed tomography system with automatic exposure control (CT-AEC) which decides the exposure dose from a positioning image. We measured exposure dose with two kinds of CT systems and evaluated the error of the displayed DLP value on the operator console against the measured DLP value. The assessment was performed in three sites: head and neck, upper chest, and lower abdomen. As a result, the errors of displayed value with CT-AEC against the error without CT-AEC in system A (4.09%) were significantly different on two assessment sites (head and neck: -4.02%, upper chest: 6.60%). There is no significant difference on the third assessment site (lower abdomen: 0.06%). On the other hand, those values in system B (8.38%) were almost similar with no significant differences (head and neck: -1.12%, upper chest: -1.85%, lower abdomen: -0.64%). The results show that there were significant differences noted between the errors of displayed value with CT-AEC and without CT-AEC in system A for the head and neck and the upper chest. In conclusion, displayed value with CT-AEC and without CT-AEC were about the same error. However, the possibility that the error depended on a model and the examination site of CT was shown.
authors.affiliation: Department of Radiological Technology, Kawasaki Medical School Hospital.
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Sanai
authors.forename: Tatsushi
authors.initials: T
authors.lastname: Tomomitsu
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Ikenaga
authors.forename: Shinji
authors.initials: S
authors.lastname: Suemori
authors.forename: Shinichi
authors.initials: S
authors.lastname: Yanagimoto
mesh_terms: D000005:Abdomen; D006257:Head; D009333:Neck; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D013909:Thorax; D014057:Tomography, X-Ray Computed / Q000295:instrumentation