双源CT泌尿系成像双能量虚拟平扫的临床评估

发布时间：2018-03-20 07:50

本文选题：X线计算机　切入点：体层摄影术　出处：《中国医学科学院学报》2010年06期 　论文类型：期刊论文

【摘要】：目的评价FLASH双源CT泌尿系成像双能量虚拟平扫临床应用的可行性。方法对240例患者进行FLASH双源CT泌尿系成像,包括常规平扫、肾实质期双能量扫描(100kVp/230mAs和Sn140kVp/178mAs)和排泄期扫描。顺序注射造影剂100ml(370mgI/ml)和100ml生理盐水,注射速度均为4.5ml/s。利用LiverVNC软件处理得到虚拟平扫CT图像,与常规平扫比较在器官CT值、噪声、信号噪声比、图像质量和放射剂量等方面的差异。结果常规平扫和虚拟平扫所测器官CT值差异均无统计学意义(P0.05),虚拟平扫图像噪声明显低于常规平扫而信号噪声比明显高于常规平扫(P0.05),虚拟平扫图像质量低于常规平扫但差异无统计学意义(P0.05),肾实质期双能量扫描放射剂量高于常规平扫和排泄期扫描(P0.05)。结论在FLASH双源CT泌尿系成像中,双能量虚拟平扫具有取代常规平扫的可能,减少1次平扫的放射剂量,具有临床应用价值。
[Abstract]:Objective to evaluate the feasibility of double energy virtual plain scan of FLASH dual source CT urography. Methods FLASH dual source CT urography, including routine plain scan, was performed in 240 patients. Renal parenchymal phase dual energy scan 100 KVP / 230mAs and Sn140 KVP / 178mAs) and excretory phase scan. Sequential injection of contrast agent 100ml-1 370mgI / ml and 100ml saline was performed at a rate of 4.5 ml / s. Virtual plain CT images were obtained by LiverVNC software and compared with conventional plain scans in organ CT values, noise, noise, Signal to noise ratio, Results there was no significant difference in CT value of organs measured by conventional plain scan and virtual plain scan. The noise of virtual plain scan was significantly lower than that of conventional plain scan, and the ratio of signal to noise was significantly higher than that of conventional plain scan. The quality of virtual plain scan was lower than that of conventional plain scan, but the difference was not statistically significant (P 0.05). The dose of dual energy scan in renal parenchyma phase was higher than that of routine plain scan and excretory phase scan (P 0.05). Conclusion in FLASH dual source CT urography, the dose of dual energy scan is higher than that of routine plain scan and excretory phase scan (P 0.05). Dual energy virtual plain scan has the possibility of replacing conventional plain scan and reducing the radiation dose of one plain scan, so it has clinical application value.
【作者单位】：中国医学科学院北京协和医学院北京协和医院放射科;
【分类号】：R816.7

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