title: Radiation Doses of Various CT Protocols: a Multicenter Longitudinal Observation Study.
abstract: Emerging concerns regarding the hazard from medical radiation including CT examinations has been suggested. The purpose of this study was to observe the longitudinal changes of CT radiation doses of various CT protocols and to estimate the long-term efforts of supervising radiologists to reduce medical radiation. Radiation dose data from 11 representative CT protocols were collected from 12 hospitals. Attending radiologists had collected CT radiation dose data in two time points, 2007 and 2010. They collected the volume CT dose index (CTDIvol) of each phase, number of phases, dose length product (DLP) of each phase, and types of scanned CT machines. From the collected data, total DLP and effective dose (ED) were calculated. CTDIvol, total DLP, and ED of 2007 and 2010 were compared according to CT protocols, CT machine type, and hospital. During the three years, CTDIvol had significantly decreased, except for dynamic CT of the liver. Total DLP and ED were significantly decreased in all 11 protocols. The decrement was more evident in newer CT scanners. However, there was substantial variability of changes of ED during the three years according to hospitals. Although there was variability according to protocols, machines, and hospital, CT radiation doses were decreased during the 3 years. This study showed the effects of decreased CT radiation dose by efforts of radiologists and medical society.
authors.affiliation: Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, the Catholic University of Korea, Seoul, Korea .
authors.forename: Jinhee
authors.identifier: 0000-0002-3386-1208
authors.initials: J
authors.lastname: Jang
authors.affiliation: Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, the Catholic University of Korea, Seoul, Korea .
authors.forename: Seung Eun
authors.identifier: 0000-0003-0674-5444
authors.initials: SE
authors.lastname: Jung
authors.affiliation: Department of Radiology, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea .
authors.forename: Woo Kyoung
authors.identifier: 0000-0002-0676-2116
authors.initials: WK
authors.lastname: Jeong
authors.affiliation: Department of Radiology, Bucheon St. Mary's Hospital, College of Medicine, the Catholic University of Korea, Bucheon, Korea .
authors.forename: Yeon Soo
authors.identifier: 0000-0002-2116-4480
authors.initials: YS
authors.lastname: Lim
authors.affiliation: Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, the Catholic University of Korea, Seoul, Korea .
authors.forename: Joon-Il
authors.identifier: 0000-0003-0018-8712
authors.initials: JI
authors.lastname: Choi
authors.affiliation: Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, the Catholic University of Korea, Seoul, Korea .
authors.forename: Michael Yong
authors.identifier: 0000-0002-5247-1475
authors.initials: MY
authors.lastname: Park
authors.affiliation: Department of Radiology, Hanyang University Guri Hospital, College of Medicine, Hanyang University, Guri, Korea .
authors.forename: Yongsoo
authors.identifier: 0000-0002-1069-0135
authors.initials: Y
authors.lastname: Kim
authors.affiliation: Department of Radiology, Severance Hospital, College of Medicine, Yonsei University, Seoul, Korea .
authors.forename: Seung-Koo
authors.identifier: 0000-0001-5646-4072
authors.initials: SK
authors.lastname: Lee
authors.affiliation: Department of Radiology, Gangnam Severance Hospital, College of Medicine, Yonsei University, Seoul, Korea .
authors.forename: Jae-Joon
authors.identifier: 0000-0002-7447-1193
authors.initials: JJ
authors.lastname: Chung
authors.affiliation: Department of Radiology, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, Korea .
authors.forename: Hong
authors.identifier: 0000-0002-9534-8098
authors.initials: H
authors.lastname: Eo
authors.affiliation: Department of Radiology, Korea University Guro Hospital, College of Medicine, Korea University, Seoul, Korea .
authors.forename: Hwan Seok
authors.identifier: 0000-0003-0247-8932
authors.initials: HS
authors.lastname: Yong
authors.affiliation: Department of Radiology, St. Vincent's Hospital, College of Medicine, the Catholic University of Korea, Suwon, Korea .
authors.forename: Sung Su
authors.identifier: 0000-0002-9534-8098
authors.initials: SS
authors.lastname: Hwang
mesh_terms: D000005:Abdomen / Q000528:radiation effects; D000792:Angiography; D001921:Brain / Q000528:radiation effects; D005260:Female; D006761:Hospitals; D006801:Humans; D008099:Liver / Q000528:radiation effects; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011829:Radiation Dosage; D014057:Tomography, X-Ray Computed / Q000295:instrumentation
keywords: Longitudinal Studies; Multidetector Computed Tomography; Radiation Dose; Radiology