...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Investigative radiology >Gauging Effective Spatial Resolution in Multirow Helical Cardiac Computed Tomography With a Dynamic Phantom.
【24h】

Gauging Effective Spatial Resolution in Multirow Helical Cardiac Computed Tomography With a Dynamic Phantom.

机译：在具有动态幻像的多行螺旋形心脏计算机断层扫描中测量有效空间分辨率。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

SUMMARY: PURPOSE To devise a numerical indicator of image quality for multirow helical cardiac computed tomography (CT) and its relation to temporal resolution.MATERIALS AND METHODS A pulsatile cardiac assist device was used to simulate cardiac wall motion by mechanically transmitting the device dynamics to a piece of tungsten wire. Wire motion induced by different device rates was captured with an 8-row subsecond helical CT scanner operating with various scanning parameters. Image artifacts were visually assessed and compared with the image point spread function (PSF) using the full width at half maximum (FWHM) area as a numerical estimate of spatial accuracy.RESULTS At rest, the FWHM area was determined as 1.3 mm2. At a device rate of 60 bpm, the FWHM area ranged from 1.51 mm2 to 21.62 mm2, depending on the time of image reconstruction. Mean reproducibility of the FWHM area measurements was determined as 0.05, whereas visual estimates of motion artifact were highly variable between different readers (kappa = 0.19). Visually determined image quality correlated closely with the FWHM area metric (Spearman's rank correlation, P = 0.0001, rho = 0.841). At a device rate of 100 bpm, the minimum FWHM area was 2.00 mm2 using a single-sector algorithm, 1.41 mm2 using a 2-segment algorithm, and 1.37 mm2 using a 4-segment algorithm.CONCLUSIONS Use of a pulsatile cardiac assist device could serve as an in vitro test bed for cardiac CT imaging methods. Area FWHM of the PSF correlates well with visually determined image quality of a dynamic phantom, but provides better reproducibility than visual analysis.
机译：摘要：目的为设计多行螺旋心脏计算机断层扫描（CT）的图像质量及其与时间分辨率的关系的数字指示器。材料和方法使用搏动性心脏辅助设备通过将设备动态传递给心脏，从而模拟心脏壁运动。钨丝。由具有不同扫描速率的8行亚秒螺旋CT扫描仪捕获了由不同设备速率引起的导线运动。视觉评估图像伪影，并使用半高全宽（FWHM）区域作为空间精度的数值估计值，将其与图像点扩展函数（PSF）进行比较。结果静止时，将FWHM区域确定为1.3 mm2。在60 bpm的设备速率下，根据图像重建的时间，FWHM区域的范围为1.51 mm2至21.62 mm2。 FWHM面积测量值的平均重现性确定为0.05，而运动伪影的视觉估计在不同阅读器之间变化很大（kappa = 0.19）。视觉确定的图像质量与FWHM面积度量紧密相关（Spearman等级相关性，P = 0.0001，rho = 0.841）。在设备速率为100 bpm的情况下，使用单扇区算法的最小FWHM面积为2.00 mm2，使用2段算法的最小FWHM面积为1.41 mm2，使用4段算法的最小FWHM面积为1.37 mm2。用作心脏CT成像方法的体外测试平台。 PSF的FWHM区域与动态幻像的视觉确定的图像质量具有很好的相关性，但是比视觉分析具有更好的可重复性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号