JANUARY 22, 2018: 220–4 222 coronary procedures performed by a single operator in our institution and were included in this analysis. Patient and procedure characteristics included in the analysis are shown in Table 1. The dose of radiation received by the operator in Cathlab B was on average 71% lower than that received in Cathlab A. By univariate analysis, the operator radiation dose was significantly associated with the arterial approach used (p= 0.008), the performance of angioplasty on at least 1 coronary lesion (p< 0.0001), and total x-ray time (p< 0.0001), but was not associated with body mass index (p= 0.14). By multivariate analysis adjusted for the operator, the cathlab where the procedure took place was independently associated with the operator’s radiation dose (p< 0.0001), as was the use of the radial approach (p= 0.0003). Conversely, angioplasty of at least 1 lesion (p= 0.20) and body mass index (p= 0.20) were not found to be related to operator radiation exposure. Our study of unselected patients undergoing invasive coronary procedures demonstrates that operator radiation exposure is significantly reduced in cathlabs equipped with the ClarityIQ technology. In view of the deterministic and stochastic risks to which operators are exposed during invasive procedures, these findings should prompt catheterization laboratories to modernize their equipment.