Abstract
310 radiology.rsna.org Radiology: Volume 271: Number 1—April 2014 trocardiographic triggering at the optimal phase and reduce the radiation exposure. However, we did not perform this analysis as this has been previously studied in heart transplant patients by Bastarrika et al (1) with use of a dual-source CT scanner. Bastarrika et al found that the endsystolic phases from 35%–45% of the RR interval resulted in the best image quality. To the best of our knowledge, however, systolic triggering may only be possible with dual-source CT scanners or the latest generation of singlesource scanners. We agree with Dr Meng’s comments about the lack of reliability of absent CAC for predicting significant coronary artery disease. However, in scanners where the radiation dose of CT angiography is much higher than that of CAC scanning, the latter may still be helpful to plan the craniocaudal extent of the CT angiogram and thus reduce the overall dose. We are thus of the view that individual centers that perform cardiac CT in heart transplant patients should adapt the precise protocol to their scanner capabilities in order to minimize the radiation dose while obtaining the required diagnostic information (2).
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