Optimization of multidetector array CT acquisition parameters for CT colonography
Optimization of multidetector array CT acquisition parameters for CT colonography
复制标题
CT结肠成像多探测器阵列CT采集参数的优化
作者：
C. McCollough
摘要背景：多探测器阵列计算机断层扫描技术增加了用户必须选择的采集参数的数量。本文研究了探测器准直、重建扫描宽度、重建扫描间隔、间距、图像噪声和患者剂量的优化标准。
方法：使用多个采集参数组合扫描充气管中含有组织等效息肉的水模。改变X射线管电流，使剂量和噪声独立匹配单探测器阵列技术。以轴向和三维格式评估图像。
结果：所有息肉在轴位和三维图像上均清晰可见。在较高的扫描床速度值下观察到螺旋伪影。5 mm宽的扫描间隔3 mm，可以显示最小的息肉：5 × 5或7 × 3（直径×高度; mm）。
结论：我们的研究结果表明，薄扫描和低噪声技术不需要用于显示临床相关大小的息肉。
AbstractBackground: Multidetector array computed tomography technology has increased the number of acquisition parameters that a user must select. This article examines the criteria by which detector collimation, reconstructed scan width, reconstruction scan interval, pitch, image noise, and patient dose can be optimized.
Methods: A water phantom containing tissue-equivalent polyps in an air-filled tube was scanned using multiple acquisition parameter combinations. X-ray tube current was changed to independently match dose and noise to a single-detector array technique. Images were assessed in axial and three-dimensional formats.
Results: All polyps were visible in axial and three-dimensional images for all scans. Helical artifacts were noted at higher table speed values. The 5-mm-wide scans spaced at 3-mm intervals allowed visualization of the smallest polyps: 5 × 5 or 7 × 3 (diameter × height; mm).
Conclusion: Our results indicate that thin-scan and low-noise techniques need not be used to visualize polyps of clinically relevant sizes.