Spectral CT with optimal monochromatic images can improve the quality of renal venography
REN Zhanli
LEI Yuxin
ZHANG Min
HE Taiping
YU Nan
Abstract：Objective To explore the application of optimal monochromatic images using dual-energy spectral CT in low-dose renal venography.Methods Forty patients for renal CT venography in Affiliated Hospital of Shaanxi University of Chinese Medicine from May 2022 to October 2023 were recruited and randomly divided into group A and group B,with twenty patients each.Group A was scanned with conventional 120 kVp with contrast agent dose of 600 mgI/kg and reconstructed with 40%ASIR.Group B was scanned with dual-energy spectral CT mode with contrast agent dose of 450 mgI/kg and reconstructed with 40%ASIR and the optimal monochromatic images.The CT values and standard deviation of the left renal vein,right renal vein and erector muscle at the same level were measured to calculate the signal-to-noise-ratio and contrast-to-noise ratio values for the renal veins.The image quality was subjectively scored by two experienced radiologists blindly using a 5-point system.The CT volumetric dose index and dose length product were recorded for both groups and the effective radiation dose was calculated.Results There were no significant difference in general data between the two groups(P>0.05).The contrast agent dose and effective radiation dose in group B were decreased by 26.2%and 23.5%respectively compared with group A(P<0.05).The CT values,signal-to-noise-ratio values and contrast-to-noise ratio values of group B were significantly higher than those of group A(P<0.05),and the standard deviation values was significantly lower than that of group A(P<0.05).The subjective score of group B was significantly higher than that of group A and the differences showed significant differences(P<0.05).Conclusion Spectral CT imaging with optimal monochromatic images can significantly reduce contrast agent dose and radiation dose in renal venography,and provide better image quality than the conventional 120 kVp protocol.
Keywords：spectral CToptimal monochromatic energyrenal venographyiodine contrast agentradiation doseimage quality
Publication Date：2024-11-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 1231-1236 )