Application of spectral CT fusion compensation strategy in coronary CT angiography

MA Yiming; YAO Mei; MU Dan; ZHANG Xin; LIU Renyuan; ZHANG Bing; YANG Shangwen; LI Qingxia

doi:10.12122/j.issn.1674-4500.2025.01.10

Abstract：Objective To explore whether the use of spectral CT(IQon CT)combined compensation strategy technology can ensure the image quality while limiting the total radiation absorption rate in coronary CT angiography.Methods The clinical data of 80 subjects admitted to Nanjing Gulou Hospital from January 2021 to December 2023 were retrospective reviewed and divided into two groups,with forty subjects in each.Group A:100 mL of contrast,injection rate of 5.0 mL/s(tube voltage 120 kV,320 mgI/mL);Group B:40 mL of contrast,injection rate of 3.5 mL/s,compensation strategy IQon CT scan(tube voltage 70 kV,270 mgI/mL).The subjective and objective evaluation[contrast to noise ratio(CNR),signal-to-noise ratio(SNR)],the radiation dose[volume dose index(CTDIvoI),product of dose length(DLP),effective dose(ED)]were compared,and contrast iodine absorption coefficient were calculated between the two groups.Results There was no significant difference in the subjective evaluation of the two groups(P>0.05),the subjective quality score of the two groups was 3 points,and the consistency of the two groups was high(P<0.05).CT values,SNR and CNR between the two images were statistically different(P<0.05);CT values in group A were lower than group B,and group B had optimal CT values,CNR and SNR at 40 keV single-energy images.In group B,CTDIvoI decreased 66.7%,DLP decreased 83.8%,and ED decreased 75.6%(P<0.05).The iodine absorption coefficient of group B was 70.1%lower than group A(85.2 g vs 25.4 g).Conclusion The application of IQon CT combined with compensation strategies in coronary CTA has broad prospects,possessing significant clinical value and great potential for promotion.