Purpose To evaluate the impact of a respiratory averaged computed tomography attenuation correction (RACTAC) instead of a standard single-phase computed tomography (CT) attenuation correction (CTAC) map on the quantitative measures of coronary 18F-NaF uptake in PET/CT. Methods This study comprised 23 patients who underwent 18F-NaF coronary PET in a hybrid PET/CT system, employing 18F-NaF (250MBq). All patients had two CT scans, a standard single-phase CTAC obtained during free-breathing, and a 4D cine-CT scan. From the Cine-CT acquisition, RACTAC maps were obtained by averaging all images acquired over 5 seconds. Two PET reconstruction protocols, one employing CTAC and another employing RACTAC for attenuation correction were considered in this study. Following reconstruction, the quantitative impact of employing RACTAC was assessed using maximum target-to-background (TBRMAX) and coronary microcalcification activity (CMA). Statistical differences were analyzed using reproducibility coefficients and Bland-Altman plots. Results In 23 patients, we evaluated 34 coronary lesions using PET reconstructions utilizing CTAC and RACTAC. There was good agreement between CTAC and RACTAC PET reconstructions for TBRMAX (median [Interquartile range, IQR]: CTAC = 1.65[1.23-2.38], RACTAC = 1.63[1.23-2.33], p=0.55), with coefficient of reproducibility of 0.18. The CMA agreement was similar (median [IQR]: CTAC = 0.10 [0-1.0], RACTAC= 0.15[0-1.03], p=0.55 with coefficient of reproducibility of 0.17 Conclusion Employing RACTAC maps does not affect the quantification of the coronary 18F-NaF uptake on PET/CT.