FLASH Protocol in Coronary CTA Reduces Radiation Exposure in Young Patients

Recent findings presented at the Society of Cardiovascular Computed Tomography meeting reveal that the FLASH protocol for coronary computed tomography angiography (CCTA) can significantly decrease radiation exposure in low-risk patients without compromising the diagnostic quality. This technique, which uses single-heartbeat acquisition on advanced CT scanners, offers a promising alternative for young patients with no known coronary artery disease.

The study, led by Dr Avinainder Singh from Brigham and Women’s Hospital, observed a median radiation dose of 0.82 mSv in a registry study involving 70 patients with an average age of 36 years. Notably, 97% of these patients received a CAD-RADS score of 0 or 1, indicating minimal to no coronary artery disease.

The FLASH protocol employs a high-pitch prospective helical acquisition mode, reducing the radiation dose to levels lower than that of a coronary artery calcium (CAC) scan, while maintaining image quality. Dr Singh described the FLASH protocol as a rapid “single heartbeat” acquisition that is both efficient and effective. Although labeled as “like gambling” due to its single-phase limitation, the protocol has shown significant success in practice.

Of the patients analyzed, 70% experienced radiation exposure below 1 mSv, with over half of the scans deemed excellent or good in quality. However, 9% were considered nondiagnostic and required repeat scanning with either another round of the FLASH protocol or a conventional multiphase approach.

Feedback from session moderator Dr Orly Goitein of Sheba Medical Center highlighted the need for broader adoption of the FLASH protocol, emphasizing its speed and efficiency. However, she noted that successful implementation depends on patient selection characteristics such as body size and heart rate.

The study underscores the potential of the FLASH protocol in minimizing radiation exposure for younger patients, addressing long-standing concerns about radiation risks in this population. It also indicates potential future integration of this technique in routine practice, particularly for young patients with chest pain and suspected coronary artery anomalies.

Senior author Dr Arthur Shiyovich anticipates that combining FLASH with advanced photon-counting CT technology could further enhance diagnostic accuracy while reducing radiation risks, making it a valuable tool in managing cardiovascular disease in young adults.