Third generation dual-source CT coronary angiography with high-pitch spiral mode versus prospectively-gated sequential mode: comparison of radiation exposure and image quality

Authors : Aydan AVDAN ASLAN, Gonca ERBAŞ, Leyla SALIMLI, Koray KILIÇ, Mehmet ARAÇ

Pages : 730-736

Doi:10.18621/eurj.1192477

View : 89 | Download : 48

Publication Date : 2023-07-04

Article Type : Research Paper

Abstract :Objectives: To compare high-pitch spiral insert ignore into journalissuearticles values(HPS); and prospectively-gated step-and-shoot insert ignore into journalissuearticles values(SAS); coronary CT angiography insert ignore into journalissuearticles values(CCTA); using third generation dual-source CT regarding objective and subjective image quality parameters and radiation exposure. Methods: Eighty pairs of patients matched for gender, age, heart rate and BMI were enrolled in this retrospective study. High-pitch spiral and prospectively ECG-gated sequential CCTA were performed using third generation dual-source CT. The signal-to-noise ratio insert ignore into journalissuearticles values(SNR); and contrast-to-noise ratio insert ignore into journalissuearticles values(CNR); in the left ventricle were calculated for each group. Image quality were also scored using four-point scale. Student t-test was used to compare SNR, CNR and mean effective dose values insert ignore into journalissuearticles values(ED); and Wilcoxon test was used to compare image quality scores. Interrater aggreement were evaluated using Cohen’s kappa statistics. Results: Between-group differences in terms of age, gender, BMI, heart rate, and Agatston score were statistically not significant. Mean SNR and CNR was higher in prospective SAS protocol insert ignore into journalissuearticles values(16.5 ± 6.2 vs. 14.7 ± 4.9, p = 0.047 and 13.0 ± 5.2 vs. 11.2 ± 4.3, p = 0.02);. Image quality scores showed no significant difference between two scan protocols insert ignore into journalissuearticles values( p > 0.05);. Regarding radiation exposure, CT dose index insert ignore into journalissuearticles values(CTDIvol);, dose length product insert ignore into journalissuearticles values(DLP); and ED was significantly lower for high-pitch group insert ignore into journalissuearticles values( p < 0.0001);. Conclusions: HPS CCTA using DSCT enables > 70% dose reduction while maintaining the image quality compared to prospectively ECG-gated SAS protocol. Therefore, HPS CCTA protocol can be preferred in patients appropriate for prospective ECG-triggered protocol.
Keywords : Coronary CT angiography, high pitch, image quality, radiation dose

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