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.
Abbreviations and Acronyms
CABG
coronary artery bypass graft
CCA
conventional coronary angiography
CT
computed tomography
CTDI
computed tomography dose index
DAP
dose-area product
DLP
dose-length product
MSCT
multislice computed tomography
Cited by (0)
Dr. Coles was supported by an educational grant from Siemens, Forchheim, Germany. A British Heart Foundation (London, United Kingdom) grant supported the cardiac multislice CT scanner at the Bristol Royal Infirmary.
