Abstract 13368: Reducing Coronary CT Angiography Radiation Exposure: How to Implement Dose Reduction Techniques in a "Real World" Study of 3,333 patients
Introduction: Coronary CT Angiography (CCTA) use is booming but exposes patients to significant radiation. Between 2009 and 2013, studies suggested prospective gating, decreasing tube voltage (kVp), current modulation and high pitch scanning reduce radiation dose without image quality loss.
Hypothesis: Developing and implementing an optimal CCTA protocol will reduce radiation exposure.
Methods: CCTAs were performed from November 2009 to March 2014 on dual-source and high-pitch scanners. As dose reduction techniques were identified in the literature, a protocol algorithm was developed and imaging staff formally educated in its use. Associations of CCTA settings to radiation dose were tested with linear regression.
Results: 3,333 CCTAs were analyzed. Annual radiation dose decreased from 8.4 mSv (2009), to 5.3, 4.4, 3.7, 2.9, and 2.8 (2014) (p<0.00005). Improvements in protocolling and staff education achieved 52% dose reduction; use of a high-pitch scanner reduced dose 15% further. Lower dose was related to lower kVp, heart rate, and BMI, female gender, current modulation, prospective gating and high-pitch mode (p<0.01).
Conclusion: Significant reduction in radiation exposure is feasible at any CCTA center with no change in infrastructure or cost by consistent use of the educational strategies, review of contributing studies, and the CCTA protocolling algorithm presented here.
Author Disclosures: K. Tandon: None. C. Hamilton-Craig: None. A.J. Wesley: None. R. O’Rourke: None. M. Paymard: None. J. Neil: None. K.R. Branch: None.
- © 2014 by American Heart Association, Inc.