小剂量测试法结合可变螺距技术在下肢动脉CT血管成像中的应用评价  

The application of low-dose test method combined with variable helical pitch technology in CT angiography of lower extremity arteries

作　　者：耿纪刚 李笑石 金大永 杨雅迪 卢璐 秦越 GENG Jigang;LI Xiaoshi;JIN Dayong;YANG Yadi;LU Lu;QIN Yue(Department of Radiology,Xi’an Daxing Hospital,Xi’an 710016,China)

机构地区：[1]西安大兴医院影像科,陕西西安710016

出　　处：《实用放射学杂志》2024年第4期646-649,669,共5页Journal of Practical Radiology

基　　金：陕西省重点研发计划项目(2023-YBSF-055)。

摘　　要：目的评价小剂量测试法联合可变螺距(VHP)技术在下肢动脉CT血管成像(CTA)中的应用效能。方法选取80例行双下肢动脉CTA患者,平均分为A、B 2组。A组使用VHP技术,B组为常规固定螺距扫描。对比2组患者的客观及主观图像质量,记录并比较2组图像的辐射剂量及对比剂用量。结果主观图像质量评价A组显著优于B组,差异有统计学意义(Kappa检验,P<0.05);客观图像质量评价中,同一层面髂总动脉、腘动脉及胫前动脉的CT值、信噪比(SNR)值A组均高于B组,有统计学差异(P<0.05);A组有效剂量(ED)值为(6.74±1.20)mSv,B组ED值为(7.93±1.78)mSv,2组有显著差异(P<0.05),A组对比剂用量较B组显著降低,A组(73.97±12.15)mL,B组(82.50±2.61)mL(P<0.05)。结论小剂量测试法联合VHP技术不仅可以降低辐射剂量和对比剂用量,还能有效提高双下肢动脉检查的成功率和图像质量,在临床中值得大力推广应用。Objective To evaluate the application efficacy of low-dose test method combined with variable helical pitch(VHP)technology in computed tomography angiography(CTA)of lower extremity arteries.Methods Eighty patients with CTA imaging of bilateral lower extremity arteries were selected and divided into group A and group B on average.VHP technology was used in group A,and conventional fixed pitch scanning was used in group B.The objective and subjective image quality of the two groups were compared,and the radiation dose and contrast agent dosage of the two groups were recorded and compared.Results The subjective image quality evaluation of group A was significantly better than that of group B,and the difference was statistically significant(Kappa test,P<0.05).In the objective image quality evaluation,the CT value and signal-to-noise ratio(SNR)value of the common iliac artery,popliteal artery and anterior tibial artery in group A were higher than those in group B at the same level,and the differences were statistically significant(P<0.05);The effective dose(ED)value in group A was(6.74±1.20)mSv,and that in group B was(7.93±1.78)mSv(P<0.05).The dosage of contrast agent in group A was significantly lower than that in group B[(73.97±12.15)mL in group A,(82.50±2.61)mL in group B](P<0.05).Conclusion Low-dose test method combined with VHP technology not only can reduce the radiation dose and contrast agent dosage,but also can effectively improve the success rate and image quality of lower extremity arteries examination,which is worthy of clinical application.

关 键 词：可变螺距 小剂量测试法 下肢动脉 计算机体层成像 血管造影术 

分 类 号：R543.5[医药卫生—心血管疾病] R814.42[医药卫生—内科学] R814.43[医药卫生—临床医学]