心电门控模式下能谱扫描和传统扫描CT值与碘对比剂浓度相关性的比较

发布时间：2018-01-19 03:23

本文关键词： 体层摄影术 X线计算机能谱成像对比剂　出处：《放射学实践》2016年11期 　论文类型：期刊论文

【摘要】：目的:评价在心电门控模式下能谱扫描和传统扫描CT值与碘对比剂浓度的关系。方法:使用能谱CT对不同浓度的碘对比剂(0~40mg/mL)分别在心脏能谱模式、心脏非能谱模式、胸部能谱模式、胸部非能谱模式进行扫描,对各模式下各能级图像(40~140KeV,间隔10KeV)及传统非能谱扫描图像(80、100、120、140kV)CT值进行测量,分析CT值与碘对比剂浓度的关系。结果:四种扫描模式下,CT值和碘对比剂浓度均呈线性关系。对能谱模式、非能谱模式的R~2值进行配对秩和检验(P=0.1120.05),二者之间没有明显的统计学差异。四种不同扫描模式的R~2值进行非参数秩和检验(χ2=3.6,P=0.3080.05),说明四种不同扫描模式的R~2值没有明显的统计学差异。但能谱模式的R~2均值(R~2=0.99953)高于非能谱模式(R~2=0.99940),心脏能谱模式(R~2=0.99972)略高于胸部能谱模式(R~2=0.99934)。结论:能谱扫描模式下心脏模式和非心脏模式的CT值和碘对比剂浓度均呈高度线性相关,可以用于CT值的定量测量。
[Abstract]:Objective: to evaluate the relationship between the concentration of iodine contrast agent and the CT value of energy spectrum scan and conventional scan in ECG gated mode. Methods: using energy dispersive CT to determine 40 mg / mL iodine contrast agent of different concentration). In the cardiac energy spectrum mode. The heart non-energy spectrum mode, chest energy spectrum mode and chest non-energy spectrum mode were scanned. The images of each energy level in each mode were 40140KeV, the interval was 10KeV) and the traditional non-energy spectrum scanning image was 80. The relationship between CT value and iodine contrast agent concentration was analyzed. Results: under four scanning modes. The correlation between CT value and concentration of iodine contrast agent was linear. The R2 value of energy spectrum mode and non-energy spectrum mode was tested by pairing rank sum test (P < 0. 1120.05). There was no significant statistical difference between the two groups. Rao _ 2 values of four different scanning modes were tested by non-parametric rank sum test (蠂 ~ 2 ~ (3. 6) P ~ (+) 0.3080.05). The results showed that there was no significant difference in R2 values between the four different scanning modes, but the R2 mean value of the energy spectrum model was 0.99953, which was higher than that of the non-energy spectrum model (0.99940). . The cardiac energy spectrum model was slightly higher than that of the chest energy spectrum model (0.99934). Conclusion: there is a high linear correlation between CT value and iodine contrast medium concentration in cardiac and non-cardiac models. It can be used for quantitative measurement of CT value.
【作者单位】：海南省农垦三亚医院放射科;三亚市妇幼保健院超声科;华中科技大学同济医学院附属同济医院放射科;
【基金】：海南省卫生计生行业科研项目(13A210298,14A210259) 三亚市医疗科技创新项目(2014YW18,2015YW36)
【分类号】：R814
【正文快照】： 常规CT扫描中,球管发生的X射线是各种不同能量水平X射线的混合,人体组织对不同能级X线的吸收率具有差异,同时受线束硬化伪影、非线性部分容积效应的影响,CT值测量的可重复性和可复现性难以得到保证,同样的组织在不同的扫描中可能呈现出不同的CT值。因此在常规CT扫描中,CT值的

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