| 郑生喜,黄宝生,杨晶晶,张丽萍,卢冬梅."双低"技术在CT肺动脉成像滤波反投影算法中可行性研究[J].中华放射医学与防护杂志,2015,35(9):717-720 |
| "双低"技术在CT肺动脉成像滤波反投影算法中可行性研究 |
| Feasibility study of low tube voltage technique and low concentration of contrast in CT pulmonary angiography by filtered back projection reconstruction |
| 投稿时间：2014-05-06 |
| DOI：10.3760/cma.j.issn.0254-5098.2015.09.020 |
| 中文关键词: 辐射剂量 对比剂 肺动脉 CT肺动脉成像 滤波反投影算法 |
| 英文关键词:Radiation dose Contrast medium Pulmonary artery CT pulmonary angiography Filtered back projection |
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| 中文摘要: |
| 目的 探讨80 kVp管电压及碘克沙醇(270 mg I/ml)条件下,采用滤波反投影(FBP)算法重建图像行CT肺动脉成像(CTPA)检查的可行性。方法 前瞻性收集52例行CTPA检查的患者,根据CT扫描管电压和对比剂不同,将患者平均分为对照组和试验组。记录两组的CT容积剂量指数(CTDIvol)和剂量长度乘积(DLP),并计算出加权剂量指数(CTDIw)和有效剂量(E)。对图像质量进行目测评分、测量及其辐射剂量进行统计学处理。结果 两组患者的性别比、年龄、身高、体重及体质量指数(BMI)差异均无统计学意义(P>0.05)。与对照组相比,试验组用碘量降低了22.9%;试验组CTDIvol、DLP、CTDIw和E分别降低了73.5%、75.1%、73.5%和75.8%(t=<0.001、30.5、<0.001、-28.7,P<0.05);两组图像均符合诊断要求,图像质量目测评价和测量结果差异均无统计学意义(P>0.05)。结论 使用80 kVp管电压和碘克沙醇行CTPA检查时,FBP重建图像质量可以满足诊断需要,同时能降低辐射剂量和对比剂用量,减少X射线管损耗。 |
| 英文摘要: |
| Objective To investigate the feasibility of CT pulmonary angiography (CTPA) with 80 kVp and contrast agent of iodixanol (270 mg I/ml) by filtered back projection (FBP) reconstruction. Methods In total, 52 patients who underwent CTPA were randomly divided into two equally-sized groups, control group and experimental group. The volume computed tomography dose index (CTDIvol) and dose-length product (DLP)were recorded, and the weighted computed tomography dose index (CTDIw) and effective dose (E) were calculated. The image quality was visually evaluated and measured, and statistical analyses were performed on the image quality and the radiation dose. Results The sex, age, height, weight and body mass index (BMI) had no statistical difference between two groups (P>0.05). The average iodine dosage decreased by 22.9% in the experimental group compared with the control group. Compared with the control group, the CTDIvol, DLP, CTDIw and E decreased by 73.5%, 75.1%, 73.5% and 75.8%, respectively. The differences were statistically significant (t=<0.001, 30.5,<0.001, -28.7, P<0.05). The image quality of the two groups met the requirement of diagnosis and there were no significant statistic differences between visually evaluating and objectively measuring the image quality (P>0.05). Conclusions Using 80 kVp and iodixanol for CTPA, FBP reconstruction image quality can meet diagnostic requirements. At the same time the radiation dose, the contrast agent dose and the X-ray tube wastage are reduced respectively. |
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