Wrist Analysis Research Laboratory, Singapore General Hospital, Singapore.
Med Eng Phys. 2013 Dec;35(12):1837-42. doi: 10.1016/j.medengphy.2013.05.009. Epub 2013 Jun 15.
Dynamic Computed Tomography (CT) promises insights into the pathophysiology of carpal instability by recording images of the carpus while it is in motion. The purpose of this study was to investigate the effect of motion velocity on image quality for dynamic carpal imaging applications using a clinical dual-source CT (DSCT) scanner.
A phantom with targets in the axial, coronal and sagittal planes was attached to a motion simulator and imaged using a 64-slice DSCT scanner. Data was acquired when the phantom was stationary and during periodic linear motion. Spatial resolution, motion artifacts and banding artifacts were assessed.
Mean spatial resolution was 0.82 mm at 36 mm/s and 0.79 mm at 18 mm/s. Banding artifacts were mild at 36 mm/s and minimal at 18 mm/s. Motion artifacts were minimal at motion velocity of up to 36 mm/s in both the coronal and sagittal planes. Axial plane motion artifacts were moderate at 36 mm/s and mild at 18 mm/s.
Sub-millimeter resolution is achievable with commercially available DSCT scanners with mild to moderate amounts of motion artifacts at velocities of 18 mm/s and 36 mm/s respectively.
动态计算机断层扫描（CT）通过记录腕关节运动时的图像，有望深入了解腕关节不稳定的病理生理学。本研究旨在使用临床双源 CT（DSCT）扫描仪研究运动速度对动态腕关节成像应用的图像质量的影响。
将一个带有轴向、冠状和矢状位目标的体模附着在运动模拟器上，并使用 64 层 DSCT 扫描仪进行成像。当体模静止和周期性线性运动时采集数据。评估空间分辨率、运动伪影和带状伪影。
在 36mm/s 时平均空间分辨率为 0.82mm，在 18mm/s 时为 0.79mm。在 36mm/s 时带状伪影轻微，在 18mm/s 时最小。在冠状面和矢状面，运动速度高达 36mm/s 时运动伪影最小。在 36mm/s 时轴向平面运动伪影为中度，在 18mm/s 时为轻度。
在 18mm/s 和 36mm/s 的速度下，商用 DSCT 扫描仪可实现亚毫米分辨率，且运动伪影为轻度至中度。
