脊柱同源动态能谱CT与MSCT辐射剂量和图像质量的对比

发布时间：2018-05-13 20:17

本文选题：脊柱 + 体层摄影术　；参考：《中国医学影像技术》2015年04期

【摘要】：目的探讨同源动态能谱CT和MSCT在脊柱扫描中的差异。方法将脊柱疾病患者50例随机分为A、B组两组,每组25例。A组采用同源双电压(80、140kVp)动态扫描,FBP重建单能量图像,记录图像噪声-能级曲线、椎体CNR随能量变化曲线,得出最低图像噪声值及最高CNR值的最佳能级,测量图像噪声及椎体CNR。B组常规MSCT扫描,FBP图像重建。比较两组辐射剂量、图像噪声和椎体CNR。结果 A组最佳能级为70keV,图像噪声为(16.12±1.48)HU,较B组(53.95±4.97)HU明显降低(t=3.25,P0.05);CNR为5.89±0.46,是B组(1.67±0.15)的3.5倍(t=5.43,P0.05);容积CT剂量指数为(7.64±0.71)mGy,较B组的(16.34±1.24)mGy降低了53%(t=15.62,P0.05)。结论同源动态能谱CT脊柱成像较常规MSCT可明显降低辐射剂量,降低图像噪声,提高椎体CNR,改善图像质量。
[Abstract]:Objective to investigate the difference of homologous dynamic energy dispersive CT and MSCT in spinal column scanning. Methods Fifty patients with spinal diseases were randomly divided into two groups: group A (n = 25). Group A (n = 25) were divided into two groups: group A (n = 25) underwent dynamic scanning with homologous double voltage of 80140kVp) to reconstruct a single energy image, to record the noise-energy level curve of the image, and to record the curve of CNR changes with energy in the vertebral body. The best energy levels of the lowest image noise value and the highest CNR value were obtained, and the image noise and the normal MSCT image reconstruction of the vertebra CNR.B group were measured. Radiation dose, image noise and vertebral CNR were compared between the two groups. Results the optimal energy level of group A was 70 Kev, and the image noise was 16.12 卤1.48mGy, which was significantly lower than that of group B (53.95 卤4.97)HU), which was 5.89 卤0.46, 3.5-fold higher than that of group B (1.67 卤0.15), and the dose index of volumetric CT was 7.64 卤0.71 mGy, which was lower than that of group B (16.34 卤1.24)mGy). Conclusion compared with conventional MSCT, dynamic energy dispersive CT can significantly reduce radiation dose, reduce image noise, improve vertebral body MSCT and improve image quality.
【作者单位】：温州医科大学附属第三医院影像科;浙江医学高等专科学校医学影像系;
【分类号】：R814.2

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