Evaluation of Urinary Calculi: A Comparison of CT Values between Spectrum CT and Conventional CT
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摘要: 目的:探讨宝石能谱CT混合能量模式QC所测CT值与常规CT扫描所测CT值的相关性。方法:经医院伦理委员会批准,收集在本院泌尿科手术的共63例患者的泌尿系结石标本,其中每例患者选取1枚较大的结石,模拟体内环境对63枚结石分别进行常规CT扫描及宝石能谱CT GSI模式扫描,扫描参数保持一致。所有图像推送到GE AW4.4工作站,1名具有多年工作经验的放射科医师采用盲法分别测量2次检查的CT值。对2组数据进行配对样本t检验及Pearson相关分析。结果:63枚结石常规平扫CT值886 HU±428 HU;QC模式CT值789 HU±351 HU,两组之间差异具有统计学意义(t=6.90,P<0.01);两者之间高度相关,相关系数r=0.978,决R2=0.957。结论:QC所测CT值较常规平扫CT值略低,两者之间高度相关,QC所测CT值大致可以代替真实平扫CT值。Abstract: Objective: To evaluate the difference of spectrum mixed energy(Quality Check) mode and conventional CT for the diagnosing of urinary calculi. Methods: Sixty-three urinary stones were obtained by endoscopic lithotripsy from the urology department of Peking university first hospital. Each calculi underwent the conventional CT scan and spectral imaging technique(Discovery CT750 HD; GE Healthcare) respectively and the scan parameters were consistent strictly. At the GE AW4.4 work station, the CT value of all the images were measured by an experienced radiologist. Paired t test and Pearson correlation analysis were used to compare differences between the two modes. Results: The average CT value of the 63 cases was 886 HU± 428 HU for conventional unenhanced CT mode, and 789 HU± 351 HU for Quality Check mode. The difference of CT value was statistically significant(t=6.90, P < 0.01). The CT value of Quality Check mode was correlated with conventional unenhanced CT mode(r=0.978, R2=0.957; P < 0.01). Conclusion: There is high correction between the two measurement modes, while the CT value of Quality Check mode is lower than that of conventional one. Quality Check mode probably can alternative the conventional CT scans in diagnosing urinary calculi.
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Keywords:
- urinary calculi /
- tomography /
- X-ray computed /
- spectral imaging
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期刊类型引用(6)
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