COMPUTED-TOMOGRAPHY SCANNING WITH SIMULTANEOUS PATIENT TRANSLATION
COMPUTED-TOMOGRAPHY SCANNING WITH SIMULTANEOUS PATIENT TRANSLATION
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DOI：
10.1118/1.596464
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发表时间：
1990-11-01
期刊：
影响因子：
3.8
通讯作者：
KING, KF
中科院分区：
文献类型：
--
作者：
CRAWFORD, CR;KING, KF
本文讨论了减少获取一组连续CT图像的投影数据所需的总时间的方法。正常情况下，在采集一组切片期间，患者在数据采集期间保持静止，并在间隔扫描延迟期间转换到下一个轴向位置。我们使用计算机模拟和在改进的扫描仪上对志愿者的扫描，演示了如果患者的翻译时间与数据采集重叠，如何获得可接受的图像质量。如果忽略并发的患者平移，结构化伪影会显著降低重建结果。我们提出了许多与传统卷积/反投影算法一起使用的加权方案，以通过使用使用来自单个和多个切片的数据的投影调制来减少结构化伪影。我们比较了这些方法在结构伪影、噪声、分辨率和患者运动方面的差异。放射科专家小组对初步结果的审查表明，当在患者呼吸周期中获得比常规扫描可能的更多切片是关键时，残余图像退化对于选定的应用是可以容忍的。
This paper deals with methods of reducing the total time rquired to acquire the projection data for a set of contiguous computed tomography (CT) images. Normally during the acquisition of a set of slices, the patient is held stationary during data collection and translated to the next axial location during an interscan delay. We demonstrate using computer simulations and scans of volunteers on a modified scanner how acceptable image quality is achieved if the patient translation time is overlapped with data acquisition. If the concurrent patient translation is ignored, structured artifacts significantly degrade resulting reconstructions. We present a number of weighting schemes for use with the conventional convolution/backprojection algorithm to reduce the structured artifacts through the use of projection modulation using the data from individual and multiple slices. We compare the methods with respect to structured artifacts, noise, resolution and to patient motion. Review of preliminary results by a panel of radiologists indicates that the residual image degradation is tolerable for selected applications when it is critical to acquire more slices in a patient breathing cycle than is possible with conventional scanning.