A large study to be published in the August issue of the American Journal of Medicine reports a record radiation dose reduction of 74.8% to MGH Cardiac CT patients during the past 6 years.

Evolution of Coronary Computed Tomography Radiation Dose Reduction at a Tertiary Referral Center


We aimed to assess the temporal change in radiation doses from coronary computed tomography angiography (CCTA) during a 6-year period. High CCTA radiation doses have been reduced by multiple technologies that, if used appropriately, can decrease exposures significantly.

A total of 1277 examinations performed from 2005 to 2010 were included. Univariate and multivariable regression analysis of patient- and scan-related variables was performed with estimated radiation dose as the main outcome measure.

Median doses decreased by 74.8% (P<.001), from 13.1 millisieverts (mSv) (interquartile range 9.3-14.7) in period 1 to 3.3 mSv (1.8-6.7) in period 4. Factors associated with greatest dose reductions (P<.001) were all most frequently applied in period 4: axial-sequential acquisition (univariate: −8.0 mSv [−9.7 to −7.9]), high-pitch helical acquisition (univariate: −8.8 mSv [−9.3 to −7.9]), reduced tube voltage (100 vs 120 kV) (univariate: −6.4 mSv [−7.4 to −5.4]), and use of automatic exposure control (univariate: −5.3 mSv [−6.2 to −4.4]).

CCTA radiation doses were reduced 74.8% through increasing use of dose-saving measures and evolving scanner technology.

Source: The American Journal of Medicine



U.S. News and World Report Best Hospitals 2014-2015

U.S. News & World Report ranks Mass General #1 in New England and #2 in the nation based on our quality of care, patient safety and reputation in 16 clinical specialties.

Search the Mass General news archive

Search the archive for previously published news articles, press releases and publications.

View all departments

Departments and Centers at Mass General have a reputation for excellence in patient care. View a list of all departments.