title: Comparison of radiation doses from multislice computed tomography coronary angiography and conventional diagnostic angiography.
abstract: OBJECTIVE
  The aim of this study was to quantify and compare effective doses from conventional angiography and multislice computed tomography (MSCT) coronary angiography using a 16-slice scanner.
  
  
  BACKGROUND
  Multislice computed tomography is now a viable modality for cardiac imaging. However, for any diagnostic use of ionizing radiation, the risk to the patient must be considered and justified.
  
  
  METHODS
  Multislice computed tomography angiography and conventional angiography were used to assess 180 patients with suspected coronary artery disease. Estimates of effective dose were derived from exposure data recorded for each patient examination. For each modality, a comparable calculation technique was used, based on Monte Carlo modeling of the standard Cristy phantom.
  
  
  RESULTS
  In a subset of 91 directly comparable patients the mean effective dose for MSCT coronary angiography was 14.7 mSv (SD 2.2) and that for conventional angiography was 5.6 mSv (SD 3.6). A significant difference in effective dose was seen between the two protocols.
  
  
  CONCLUSIONS
  The mean effective dose for MSCT coronary angiography was significantly higher than that for conventional angiography. As MSCT cardiac scanners become increasingly available, operators must be aware of the radiation dose and the factors that affect it.
authors: Department of Cardiology, Bristol Heart Institute, Bristol Royal Infirmary, Bristol, United Kingdom.
authors: Duncan R
authors: DR
authors: Coles
authors: Mary A
authors: MA
authors: Smail
authors: Ian S
authors: IS
authors: Negus
authors: Peter
authors: P
authors: Wilde
authors: Martin
authors: M
authors: Oberhoff
authors: Karl R
authors: KR
authors: Karsch
authors: Andreas
authors: A
authors: Baumbach