低辐射剂量联合IMR重建在肺动脉CTA中的应用研究

发布时间：2018-09-05 18:45

【摘要】：目的探讨飞利浦256层Brilliance iCT低辐射剂量联合迭代重建(IMR)在肺动脉CTA中的应用价值。方法前瞻性搜集临床怀疑肺栓塞行肺动脉CTA检查的62例患者,将其随机分为A、B两组,其中A组32例,采用100 kV,自动mA扫描,图像按滤波反投影方式重建;B组30例,采用100 kV、50 mAs扫描,按IMR重建。由两位高年资放射科医师用5分法主观评价图像质量,利用工作站后处理比较两组间图像质量并记录分值;测量肺动脉主干、左、右肺动脉干及左下、右下肺动脉CT值及SD值,计算其平均值。利用独立样本t检验比较两组间的CT值、SD值、信噪比(SNR)、对比噪声比(CNR)、容积CT剂量指数(CTDI_(vol))、剂量长度乘积(DLP)和有效剂量(ED)的差异。结果两组间图像质量主客观评价差异无统计学意义,两组间患者CTDI_(vol)、DLP和ED方面差异有统计学意义。结论飞利浦256层Brilliance iCT IMR重建技术用于肺动脉CTA检查,其图像质量在满足临床诊断需要的同时,可以有效地降低患者的辐射剂量。
[Abstract]:Objective to investigate the application value of Philips 256 Brilliance iCT low radiation dose combined with iterative reconstruction (IMR) in pulmonary artery CTA. Methods Sixty-two patients with suspected pulmonary embolism were randomly divided into group A (n = 32), group A (n = 32) and group B (n = 30). 100 kV,50 mAs scan and IMR reconstruction were used. The image quality was evaluated subjectively by two senior radiologists with 5 points method. The image quality of the two groups was compared and recorded by workstation post processing, and the CT and SD values of the main pulmonary artery, the left, the right and the lower left pulmonary arteries, and the right lower pulmonary artery were measured. Calculate its average value. The CT value and SD value of the two groups were compared by t-test of independent samples, and the difference between (CNR), volume CT dose index (CTDI_ (vol), dose length product (DLP) and effective dose (ED) and SNR (SNR), contrast noise ratio (CNR), volume CT dose index) was compared between the two groups. Results there was no significant difference in subjective and objective evaluation of image quality between the two groups, but there was significant difference in CTDI_ (vol) and ED between the two groups. Conclusion Philips 256-slice Brilliance iCT IMR reconstruction technique can effectively reduce the radiation dose of patients with pulmonary artery CTA, and its image quality can not only meet the needs of clinical diagnosis but also reduce the radiation dose of patients.
【作者单位】：苏州大学附属第一医院放射科;
【分类号】：R543.2;R816.2

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