Radiation doses of various CT protocols: A multicenter longitudinal observation study

Jinhee Jang, Seung Eun Jung, Woo Kyoung Jeong, Yeon Soo Lim, Joon Il Choi, Michael Yong Park, Yongsoo Kim, Seung Koo Lee, Jae Joon Chung, Hong Eo, Hwan Seok Yong, Sung Su Hwang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)S24-S31
JournalJournal of Korean medical science
Publication statusPublished - 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 The Korean Academy of Medical Sciences.


  • Longitudinal studies
  • Multidetector computed tomography
  • Radiation dose
  • Radiology

ASJC Scopus subject areas

  • General Medicine


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