Effect of dual source CT dual low scan combined with new virtual single energy imaging technique can be used for aortic CT angiography
LI Tiantian
HU Chunfeng
Abstract：Objective To investigate the effect of low contrast agent dosage and low flow rate combined with the new virtual single energy imaging(Mono+)technology on the degree of vascular enhancement and image quality in aortic CT images.Methods A total of 120 patients with suspected aortic dissection who underwent CTA examination in our hospital from December 2023 to April 2024 were prospectively collected,and were randomly divided into routine group and experimental group,with 60 cases each group.The conventional group used conventional scanning;The experimental group used dual-energy scanning.The CT value and noise value(SD)of the aorta and its branches were measured,and the signal-to-noise ratio and contrast-to-noise ratio of the aorta and its branches were calculated using the SD value of the posterior muscle group of the T12 layer as the reference noise.Mono+technique was used to obtain seven sets of single energy images of 40,45,50,55,60,65 and 70 keV,respectively.The objective and subjective evaluation criteria of these single energy images were analyzed,and the dose of contrast agent,injection rate,radiation dose and image quality were compared and evaluated.Results In the 7 groups of single energy,CT values,signal-to-noise ratio and contrast-to-noise ratio of aorta and its branches gradually decreased with the increase of voltage(P<0.05).The subjective score of 60 keV group was the highest(P<0.05).Compared with the conventional group,the dosage of contrast agent in the experimental group was reduced by 18%.The rate was reduced to 2.54±0.09 mL/s(P<0.05).In addition,CT volume dose index,dose-length product and effective dose in the experimental group were reduced by about 50%compared with the control group,and the difference was statistically significant(P<0.05).Conclusion In aortic CTA imaging,the combination of low contrast agent dosage and low flow rate with Mono+technology is feasible.Compared with traditional imaging methods,this method can not only meet the needs of clinical image quality,but also significantly reduce the use of contrast agent,injection rate and radiation dose.
Keywords：dual-source CT scandual energy imaging technologynew generation of virtual single energy imaging technologyCT angiography
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：7( 1218-1224 )