双源CT低碘量注射联合低管电压在老年冠心病患者CTA诊断中的应用  

Application of Dual-source CT Low-iodine Injection Combined with Low Tube Voltage in the CTA Diagnosis of Elderly Patients with Coronary Heart Disease

作　　者：马欣[1] MA Xin(Department of Cardiology,Jiaozuo Second People's Hospital,Jiaozuo 454001,Henan Province,China)

机构地区：[1]焦作市第二人民医院心内科,河南焦作454001

出　　处：《中国CT和MRI杂志》2021年第9期75-77,共3页Chinese Journal of CT and MRI

摘　　要：目的探究双源CT低碘量注射联合低管电压用于老年冠心病患者CT血管成像(CTA)诊断中的可行性。方法选取2017年1月至2019年6月64例行CTA检查的可疑冠心病患者,按就诊顺序奇偶数法分成观察组与对照组各32例,两组均采用西门子双源64排CT机完成检查,观察组检查时注射270mg(I)/mL碘克沙醇50mL,采用管电压80k V,对照组检查时注射320mg(I)/mL碘克沙醇50mL,采用管电压120 V,比较两组图像质量评分,测量图像升主动脉段(AO)、左冠状动脉主干(LM)、左冠状动脉前降支(LAD)近段、左冠状动脉回旋支(LCX)近段、右冠状动脉(RCA)近段CT值,计算图像噪声、图像信噪比(SNR)以及LM、LAD近段、LCX近段、RCA近段对比度噪声比(CNR),记录剂量参数[剂量长度乘积(DLP)、CT容积剂量指数(CTDIvol)、有效辐射剂量(ED)]。结果观察组与对照组整体图像质量评分及各血管段评分情况比较差异均无统计学意义(P>0.05);观察组AO、LM、LAD近段、LCX近段、RCA近段各节段所测CT值均显著高于对照组对应段(P<0.05);观察组图像噪声显著高于对照组(P<0.05),但两组SNR及LM、LAD近段、LCX近段、RCA近段CNR比较差异无统计学意义(P>0.05);观察组DLP、CTDIvol、ED值显著低于对照组(P<0.05)。结论双源CT低碘量注射联合低管电压用于老年冠心病患者CTA检查,可满足图像质量及诊断要求,同时降低碘摄入量及有效辐射剂量,值得临床应用。Objective To explore the feasibility of dual-source CT low-iodine injection combined with low tube voltage in the CT angiography(CTA)diagnosis of elderly patients with coronary heart disease.Methods From January 2017 to June 2019,64 patients with suspected coronary heart disease who underwent CTA examination were selected and divided into observation groups and control groups according to the parity of admission sequence,with 32 cases in each group.The two groups were given Siemens dual-source 64-row CT machine to complete the examination,and the observation group was injected with 50 ml of 270 mg I/mL iodixanol and given a tube voltage of 80 kV at the examination.The Control group was injected with 50mL of 320mg I/mL iodixanol and given a tube voltage of 120kV at the examination.The image-quality score of the two groups was compared.The CT values of ascending aortic segment(AO),left main coronary artery(LM),proximal segment of left anterior descending coronary artery(LAD),proximal segment of left circumflex coronary artery(LCX),and proximal segment of right coronary artery(RCA)were measured.The image noise,image signal-to-noise ratio(SNR),and contrast-to-noise ratio(CNR)of LM,LAD proximal segment,LCX proximal segment,and RCA proximal segment were calculated,and the dose parameters[dose length product(DLP),CT volume dose index(CTDIvol),effective radiation dose(ED)]were recorded.Results There were no significant differences in the overall image quality score and scores of vascular segments between the observation and control groups(P>0.05).The CT values of AO,LM,LAD proximal segment,LCX proximal segment,and RCA proximal segment in the observation group were significantly higher than those in the control group(P<0.05).The image noise in the observation group was significantly higher than that in the control group(P<0.05),but there were no significant differences in the SNR and CNR of LM,LAD proximal segment,LCX proximal segment,and RCA proximal segment between the two groups(P>0.05).The DLP,CTDIvol,and ED in the ob

关 键 词：老年冠心病 双源CT 低管电压 低碘对比剂 CT血管成像 

分 类 号：R541.4[医药卫生—心血管疾病] R445.3[医药卫生—内科学]