Application of Dual Low-dose Technique in Dual-energy Head and Neck CT Angiography
Objective To study the feasibility of dual-source CT double low-dose scanning technology in dual-energy head and neck CTA.Methods A total of 102 patients with CTA due to vascular diseases of the head and neck in our hospital from January 2021 to May 2021 were prospectively collected and included into the study,and randomly divided into CD and DLD groups.The CD group underwent conventional dose scanning(tube voltage 100/Sn140kV,pitch 0.9,70mL contrast agent),and the DLD group underwent double low dose scanning(tube voltage 80/Sn140kV,pitch 1.2,P＜0.05).The CD group underwent FBP reconstruction,linear fusion(M=0.6)to obtain the equivalent 120kV image,the DLD group underwent SAFIRE iterative reconstruction(iterative intensity level 3),and the 65keV energy spectrum was obtained by virtual monoenergetic technology.The two groups of images were processed with dual energy bone removal and calcification,MIP,VR,MPR,CPR and other post-processing technique.The X-ray dose parameters of the two groups were recorded,including CTDIvol(mGy)and DLP(mGy·cm),and the effective dose ED(mSv)was calculated.The iodine ingestion of the two groups was calculated,and the image quality of the two groups was evaluated subjectively and objectively,and the results were statistically analyzed.Results The image quality scores of CD group and DLD group were both＞3,which could meet the requirements of diagnosis.The two radiologists had good consistency in image quality evaluation of the two groups(Kappa values were 0.817 and 0.825).There was no significant difference in subjective image quality scores between the two groups(Z=-0.572,-0.283,both P＞0.05).There was no significant difference in the CT value of blood vessels at each level between the CD group and the DLD group(t=-0.705,0.689,0.906,all P＞0.05).There was no significant difference in vessel noise,SNR and CNR between the initial part of internal carotid artery and the M1 segment of middle cerebral artery(t=-0.830～1.842,all P＞0.05).However,the noise of the initial part of the common carotid artery in the CD group was higher than that in the DLD group(t=2.855,P＜0.05),SNR and CNR were lower than those in the DLD group(t=-4.959,-5.041,all P＜0.05).CTDIvol,DLP and ED in the DLD group were 36.9％,35.3％and 35.2％lower than those in the CD group,respectively(t=186.138,37.753,37.753,all P＜0.05).Iodine intake in the DLD group was 57.1％lower than that in the CD group(10.5g VS.24.5g).Conclusion The dual-low dose dual-energy head and neck CTA scanning technology can reduce the radiation dose and iodine intake of contrast medium without affecting the image quality.
Low DoseDual Energy ImagingHead and Neck CTAVirtual Monoenergetic Spectrum
万方数据
维普
