头颈部CTA中GSI扫描联合“双低”技术在中老年人群体的应用价值  

Analysis of the Value of GSI Scanning Combined with “Double-low” Technology in Head and Neck CTA in Middle-aged and Elderly Individuals

作　　者：张晓龙 赵英明[2] 张国祥 魏方生 陈呈 ZHANG Xiaolong;ZHAO Yingming;ZHANG Guoxiang;WEI Fangsheng;CHEN Cheng(Graduate School of Bengbu Medical University,Bengbu 233030,China;The First Affiliated Hospital of USTC,Division of Life Sciences and Medicine,University of Science and Technology of China,Hefei 230001,China)

机构地区：[1]蚌埠医科大学研究生院,安徽蚌埠233030 [2]中国科学技术大学附属第一医院(安徽省立医院)影像科,合肥230001

出　　处：《CT理论与应用研究(中英文)》2025年第2期295-302,共8页Computerized Tomography Theory and Applications

基　　金：中国科学技术大学附属第一医院医学人工智能联合基金创新项目(MAI2023C006)。

摘　　要：目的:探讨头颈部CTA中GSI扫描联合“双低”技术在中老年人群体的应用价值。材料和方法:回顾性收集2023年2月至12月行头颈CTA检查患者的影像资料150例,根据不同的扫描方式分为A、B和C 3组,各50例。A组和B组均为常规螺旋扫描,管电压分别为120 kV和100 kV,均为管电流自动调制300~500 mA,对比剂用量及流速均为固定55 mL和4.5 mL/s,盐水以与对比剂相同用量及流速进行注射。C组能谱扫描,平扫组管电压为80 kV,增强组管电压为80~140 kV瞬时切换,管电流均为恒定的320 mA,采用个性化对比剂注射方案。对3组影像资料进行主观评价、客观评价及比较对比剂用量、平均注射速率。结果:B组头颈部各血管平均CT值大于A组和C组,差异具有统计学意义;主动脉弓层面,B组SNR及CNR参数优于A组和C组,差异具有统计学意义;其余血管层面C组SNR、CNR、SD参数均优于A组和B组,除颈总动脉层面,差异具有统计学意义;C组DLP相较于A组和B组分别降低53.9%和27.6%,对比剂用量降低27.2%。C组对比剂平均注射速率为(3.9±0.5)mL/s低于A组和B组固定流速4.5 mL/s。结论:在中老年人群体中,以GSI扫描模式联合“双低”技术行头颈CTA可有效降低辐射剂量、减少对比剂用量及改善图像质量。Objective:This study aimed to investigate the value of gemstone spectral imaging(GSI) scanning combined with "doublelow" technology in head and neck computed tomography angiography(CTA) in middle-aged and elderly individuals.Materials and Methods:One hundred fifty patients who underwent head and neck CTA from February to December 2023 were retrospectively collected and divided into three groups,comprising 50 patients each,according to different scanning modalities;A,B,and C.Groups A and B underwent conventional spiral scans,with tube voltages of 120 kV and 100 kV,respectively,and tube currents of 300 ~ 500 mA were automatically modulated,and the dose and flow rate of the contrast agent were fixed at 55 mL,4.5 mL/s,saline with the same dose and flow rate for flushing and group C energy spectrum scanning,the tube voltage of the flat scanning group was 80 kV,the tube voltage of the enhancement group was 80 ~ 140 kV instantaneous switching,and the tube current was a constant 320 mA in all cases,with a personalized contrast agent injection scheme.The subjective evaluation,objective evaluation,and comparison of contrast use dose were performed on the imaging data of all groups.Results:The mean CT values of head and neck vessels in group B were greater than those in groups A and C,with statistically significant differences.At the aortic arch level,the SNR and CNR parameters in group B were better than those in groups A and C,with statistically significant differences.At the level of the remaining blood vessels,the SNR,CNR,and SD parameters of group C were better than those in groups A and B,excluding the common carotid artery level,with statistically significant differences.The radiation dose in group C was 53.9% and 27.6% lower than that in groups A and B,respectively,and the contrast dose was 27.2% lower.Conclusion:In middle-aged and elderly individuals,head and neck CTA with GSI scanning combined with “double-low” technique can effectively reduce radiation and contrast doses and improve image quality.

关 键 词：CT血管造影术 能谱单能量 辐射剂量 对比剂 

分 类 号：R816.1[医药卫生—放射医学] R818.7[医药卫生—临床医学]