![]() ![]() ![]() Coronary artery calcium (CAC) scoring is a highly sensitive test for detecting CAD, and the test has an established role in risk stratifying patients who have intermediate risk of CAD events by Framingham scoring. Using contemporary CT scanners and protocols, the effective dose for coronary artery calcium is approximately 1 mSv, an estimate which is consistently lower than previously reported for CAC scanning, regardless of age, gender, and body mass index.Ĭardiac computed tomography (CT) imaging is a valuable tool for noninvasively evaluating coronary artery disease (CAD). Subjects over age 75 yo had a mean effective dose of 1.29 ± 0.31 mSv, while the 40 kg/m 2 was significantly greater than other subgroups, with mean dose of 1.47 ± 0.51 mSv ( p < 0.01). Subgroup analysis by BMI, age, and gender showed no variability between scanners, gender, ages 45–74 years old, or BMI less than 30 kg/m 2. The Siemens Somatom Definition scanner had effective dose of 0.53 (n = 123), Siemens 64 with 0.97 (n = 1684), GE 64 with 1.16 (n = 1219), and Toshiba 320 with 1.26 mSv (n = 416). The mean effective dose ranged from 0.74 to 1.26 across the six centers involved with the MESA cohort. The mean effective dose amongst all participants was 1.05 mSv, a median dose of 0.95 mSV. For effective dose calculation (milliSieverts, mSv), we multiplied the dose length product by conversion factor k (0.014). We reviewed effective dose in milliSieverts (mSv) for 3442 participants from the MESA cohort undergoing coronary artery calcium scoring, divided over six sites with four different modern CT scanners (Siemens64, Siemens Somatom Definition, GE64, and Toshiba 320). To evaluate the mean effective doses of radiation, using dose length product, utilized for coronary artery calcium scoring in the MESA cohort, in an effort to understand estimated population quantity effective dose using individual measurements of scanner radiation output using current CT scanners. ![]() In this study, we report the radiation exposure of calcium scoring from our MESA cohort across several modern CT scanners with the aim of clarifying the radiation exposure of this imaging modality. Newer CT protocols have sought to reduce radiation exposure without compromising image quality, but the reported radiation exposures in the literature remains widely variable (0.7–10.5 mSv). With the increasing use of coronary artery calcium (CAC) scoring to risk stratify asymptomatic patients for future cardiovascular events, there have been concerns raised regarding the theoretical risk of radiation exposure to this potentially large patient population. ![]()
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