BSCI radiation dose audit of computed tomography coronary angiography 2014

In 2014 the BSCI carried out an audit of the radiation dose of computed tomography coronary angiography, led by Dr Elly Castellano.

During March, 49 centres collected information on their cardiovascular CT work at the scanner side. Data included administration of beta-blockers, patient heart rate and BMI, and radiation dose descriptors for each series and for the total exam. The data at each centre was analysed to extract the median exam DLP, acquisition heart rate and patient BMI. If sufficient exams were available, further analysis was carried out to calculate the median exam DLP for prospective and retrospective acquisitions separately, and for the average patient with a heart rate of 60 bpm and a BMi of 28 kg/m2.

The median value across all participating centres of the median exam DLPs was 200 mGycm (inter-quartile range 130 to 320 mGycm). Using padding doubles the exam DLP from 120 to 250 mGycm for prospectively acquired exams, whereas retrospective gating with tube current pulsing increases the exam DLP by only a further 25% to 320 mGycm.