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Cardiac CT: are we underestimating the dose? A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume.
Clin Radiol. 2010 Dec; 65(12):1013-7.CR

Abstract

AIM

To calculate the effective dose from cardiac multidetector computed tomography (MDCT) using a computer-based model utilizing the latest International Commission on Radiation Protection (ICRP) 103 tissue-weighting factors (2007), to compare this dose with those calculated with previously published chest conversion factors and to produce a conversion factor specific for cardiac MDCT.

MATERIALS AND METHODS

An observational study of 152 patients attending for cardiac MDCT as part of their usual clinical care in a university teaching hospital. The dose for each examination was calculated using the computer-based anthropomorphic ImPACT model (the imaging performance assessment of CT scanners) and this was compared with the dose derived from the dose-length product (DLP) and a chest conversion factor.

RESULTS

The median effective dose calculated using the ImPACT calculator (4.5 mSv) was significantly higher than the doses calculated with the chest conversion factors (2.2-3 mSv).

CONCLUSION

The use of chest conversion factors significantly underestimates the effective dose when compared to the dose calculated using the ImPACT calculator. A conversion factor of 0.028 would give a better estimation of the effective dose from prospectively gated cardiac MDCT.

Authors+Show Affiliations

Plymouth Hospitals NHS Trust, Derriford Hospital, Plymouth, Devon, UK. Oliver.gosling@pms.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21070906

Citation

Gosling, O, et al. "Cardiac CT: Are We Underestimating the Dose? a Radiation Dose Study Utilizing the 2007 ICRP Tissue Weighting Factors and a Cardiac Specific Scan Volume." Clinical Radiology, vol. 65, no. 12, 2010, pp. 1013-7.
Gosling O, Loader R, Venables P, et al. Cardiac CT: are we underestimating the dose? A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume. Clin Radiol. 2010;65(12):1013-7.
Gosling, O., Loader, R., Venables, P., Rowles, N., Morgan-Hughes, G., & Roobottom, C. (2010). Cardiac CT: are we underestimating the dose? A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume. Clinical Radiology, 65(12), 1013-7. https://doi.org/10.1016/j.crad.2010.08.001
Gosling O, et al. Cardiac CT: Are We Underestimating the Dose? a Radiation Dose Study Utilizing the 2007 ICRP Tissue Weighting Factors and a Cardiac Specific Scan Volume. Clin Radiol. 2010;65(12):1013-7. PubMed PMID: 21070906.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cardiac CT: are we underestimating the dose? A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume. AU - Gosling,O, AU - Loader,R, AU - Venables,P, AU - Rowles,N, AU - Morgan-Hughes,G, AU - Roobottom,C, Y1 - 2010/09/29/ PY - 2010/05/05/received PY - 2010/08/04/revised PY - 2010/08/11/accepted PY - 2010/11/13/entrez PY - 2010/11/13/pubmed PY - 2011/2/12/medline SP - 1013 EP - 7 JF - Clinical radiology JO - Clin Radiol VL - 65 IS - 12 N2 - AIM: To calculate the effective dose from cardiac multidetector computed tomography (MDCT) using a computer-based model utilizing the latest International Commission on Radiation Protection (ICRP) 103 tissue-weighting factors (2007), to compare this dose with those calculated with previously published chest conversion factors and to produce a conversion factor specific for cardiac MDCT. MATERIALS AND METHODS: An observational study of 152 patients attending for cardiac MDCT as part of their usual clinical care in a university teaching hospital. The dose for each examination was calculated using the computer-based anthropomorphic ImPACT model (the imaging performance assessment of CT scanners) and this was compared with the dose derived from the dose-length product (DLP) and a chest conversion factor. RESULTS: The median effective dose calculated using the ImPACT calculator (4.5 mSv) was significantly higher than the doses calculated with the chest conversion factors (2.2-3 mSv). CONCLUSION: The use of chest conversion factors significantly underestimates the effective dose when compared to the dose calculated using the ImPACT calculator. A conversion factor of 0.028 would give a better estimation of the effective dose from prospectively gated cardiac MDCT. SN - 1365-229X UR - https://www.unboundmedicine.com/medline/citation/21070906/Cardiac_CT:_are_we_underestimating_the_dose_A_radiation_dose_study_utilizing_the_2007_ICRP_tissue_weighting_factors_and_a_cardiac_specific_scan_volume_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0009-9260(10)00303-X DB - PRIME DP - Unbound Medicine ER -