优化双下肢动脉能谱CT血管造影成像方案  

Optimazation of energy spectrum CT single energy imaging for lower limb artery CT angiography

作　　者：胡莹莹[1] 张珂 何辰宇 孙宏亮[1] 王蕾[1] 谢晟[1] HU Yingying;ZHANG Ke;HE Chenyu;SUN Hongliang;WANG Lei;XIE Sheng(Department of Radiology,China-Japan Friendship Hospital,Beijing 100029,China;Department of Radiology,the Fourth Affiliated Hospital,Zhejiang University School of Medicine,Yiwu 322000,China)

机构地区：[1]中日友好医院放射诊断科,北京100029 [2]浙江大学医学院附属第四医院放射科,浙江义乌322000

出　　处：《中国介入影像与治疗学》2024年第4期242-246,共5页Chinese Journal of Interventional Imaging and Therapy

基　　金：中日友好医院自发性研究项目(2023-ZF-19)。

摘　　要：目的优化双下肢动脉能谱CT血管造影(CTA)成像方案。方法回顾性分析30例疑诊双下肢动脉硬化性闭塞症(ASO)患者双下肢动脉能谱CTA资料,经重建获得40~80 keV(间隔5 keV)单能量(共9种)及100 kVp混合能量图像,对比双下肢动脉在不同图像中的CT值、噪声(SD)值、信噪比(SNR)及对比度噪声比(CNR);针对50、60 keV单能量和100 kVp混合能量图像质量及血管节段的可诊断性进行主观评估,观察40、45、50、60 keV单能量和100 kVp混合能量图像的自动去骨能力。结果40~80 keV范围内,随keV升高,各动脉在图像中的CT值、SD值、SNR及CNR均逐渐降低。相比100 kVp,腘动脉(PA)及其近端动脉的CT值、CNR及SNR均在40~55 keV图像中升高(P均<0.05);50~55 keV图像中SD值升高(P均<0.05),而60 keV图像中差异无统计学意义(P>0.05)。50及60 keV图像质量主观评分及可诊断动脉节段数与100 kVp差异均无统计学意义(P均>0.05)。PA以远节段的SNR及CNR在各单能量图像及100 kVp图像中差异均无统计学意义,其CT值在40~45 keV图像中、SD在40 keV图像中均高于100 kVp(P均<0.05),但SD在45 keV与100 kVp图像中差异无统计学意义(P>0.05);50 keV图像中,PA以远节段图像质量主观评分及可诊断节段数均高于60 keV及100 kVp(P均<0.05)。40 keV图像对9例(9/30,30.00%)、45 keV图像对6例(6/30,20.00%)不能自动去骨,50及60 keV、100 kVp对30例(30/30,100%)均可自动去骨。结论行双下肢动脉能谱CTA时,对PA及其近端节段以60 keV单能量成像较佳,对其以远或双下肢全程则以50 keV单能量成像较佳。Objective To optimize the scheme of energy spectrum CT single energy imaging for lower limb artery CT angiography(CTA).Methods Data of 30 patients with suspected double lower limbs arteriosclerosis obliteran(ASO)who underwent energy spectrum CTA of lower extremity arteries were retrospectively analyzed.Totally 9 kinds of 40—80 keV(with interval of 5 keV)single energy and 100 kVp mixed energy images were reconstructed.CT values,standard deviation(SD)values,signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)of the arteries were compared among different images.Subjective evaluation of image quality and diagnosability of arterial segments on 50,60 keV single energy and 100 kVp mixed energy images were performed,and the automatic bone removal ability of 40,45,50,60 keV single energy and 100 kVp mixed energy images were observed.Results On 40—80 keV images,with the increase of keV,CT value,SD value,SNR and CNR of the arteries gradually decreased.Compared with 100 kVp images,CT value,CNR and SNR of popliteal arteries(PA)and proximal arteries of PA increased on 40—55 keV images(all P<0.05),while SD values of the above vessels increased on 50—55 keV images(both P<0.05),but being not significantly different with that on 60 keV images(P>0.05).The subjective scores of 50 keV and 60 keV images,the number of diagnosable vascular segments were not significantly different with those on 100 kVp images(all P>0.05).SNR and CNR of the distal segments below PA were not significantly different on single energy images compared with those on 100 kVp images,while CT values of the above segments on 40—45 keV images and SD on 40 keV images were all higher than those on 100 kVp images(all P<0.05),but no significant difference of SD was found between 45 keV and 100 kVp images(P>0.05).The subjective scores of the distal segments below PA and the number of diagnostic vascular segments on 50 keV images were superior to those on 60 keV and 100 kVp images(all P<0.05).Failed complete automatic bone removal was detected in 9 cases(

关 键 词：下肢 动脉 CT血管成像 能谱CT 

分 类 号：R543[医药卫生—心血管疾病] R814.42[医药卫生—内科学]