UNASSIGNED: With the increasing use of coronary artery @entity460 (CAC) scoring to risk stratify asymptomatic @entity1 for future cardiovascular events, there have been concerns raised regarding the theoretical risk of radiation exposure to this potentially large @entity1 population. 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  @entity2073 ). In this study, we report the radiation exposure of @entity460 scoring from our MESA cohort across several modern CT scanners with the aim of clarifying the radiation exposure of this imaging modality. To evaluate the mean effective doses of radiation, using dose length product, utilized for coronary artery @entity460 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. We reviewed effective dose in milliSieverts ( @entity2073 ) for 3442 @entity1 from the MESA cohort undergoing coronary artery @entity460 scoring, divided over six sites with four different modern CT scanners (Siemens64, Siemens Somatom Definition, GE64, and Toshiba 320). For effective dose calculation (milliSieverts, @entity2073 ), we multiplied the dose length product by conversion factor k (0.014). The mean effective dose amongst all @entity1 was 1.05  @entity2073 , a median dose of 0.95  @entity2073 . The mean effective dose ranged from 0.74 to 1.26 across the six centers involved with the MESA cohort. 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  @entity2073 (n  =  416). 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). Subjects over age 75 yo had a mean effective dose of 1.29      0.31  @entity2073 , while the <75 yo subgroup was 0.78      0.09  @entity2073 (p  <  0.05). Effective doses in subjects with BMI  >  40  kg/m(2) was significantly greater than other subgroups, with mean dose of 1.47      0.51  @entity2073 (p  <  0.01). Using contemporary CT scanners and protocols, the effective dose for coronary artery @entity460 is approximately 1  @entity2073 , an estimate which is consistently lower than previously reported for CAC scanning, regardless of age, gender, and body mass index.

Coronary XXXX scans and radiation exposure in the multi-ethnic study of atherosclerosis.

@entity1 :: ('9606', 'Species') :: ['participants', 'patients', 'patient'] @entity2073 :: ('10821', 'Species') :: ['mSV', 'mSv'] @entity460 :: ('MESH:D002118', 'Chemical') :: ['calcium']
@entity460 :: (MESH:D002118,Chemical) :: ['calcium']
