Resumo

CAPUNAY, Carlos et al. Imaging quality and effective radiation dose of prospective ECG-gated axial multidetector row computed tomography coronary angiography Objective. Rev. argent. radiol. [online]. 2011, vol.75, n.3, pp.177-185. ISSN 1852-9992.

To determine the imaging quality and effective radiation dose (ERD) of prospective ECG-gated multidetector row computed tomography coronary angiography (PMDCT-CA) compared to retrospective ECG-gating (RMDCT-CA). Materials and Methods. Forty-five PMDCT-CA scans were retrospectively reviewed for assessing imaging quality and ERD, and compared to 90 RMDCT-CA scans performed with (n= 45) and without (n= 45) tube current modulation, selected from our database on the basis of similar demographical characteristics. ERD was compared between all three groups. Imaging quality was assessed by two independent observers and compared to the imaging quality of the group of RMDCT-CA scans performed with tube current modulation. The interobserver variability was also determined. Results. There were no significant differences in imaging quality between the two groups. Interobserver variability was k=0.92 (95 % CI: 0.87-0.96). The ERD (mean ± SD) using PMDCT-CA was 2.88 ± 0.37 mSv compared to 10.50 ± 1.15 mSv (p<0.0001) using RMDCT-CA performed without tube current modulation and 7.92 ± 0.99 mSv (p<0.0001) using RMDCT-CA with tube current modulation. Conclusions. In our experience, PMDCT-CA proved to be an adequate imaging acquisition technique for selected patients with regular heart rhythm and a stable heart rate, with a substantial reduction in ERD and an image quality comparable to that of RMDCT-CA.

Palavras-chave : Computed tomography coronary angiography; Image quality; Prospective gating acquisition; Radiation dose.

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