Qanadli S D, El Hajjam M, Mesurolle B, Lavisse L, Jourdan O, Randoux B, Chagnon S, Lacombe P
Department of Radiology, University René Descartes-Paris V, Ambroise Paré Hospital, Boulogne, France.
J Comput Assist Tomogr. 1999 Jan-Feb;23(1):1-6. doi: 10.1097/00004728-199901000-00001.
Motion artifacts of the ascending aorta may impair image quality and simulate an intimal flap or a false channel. The purpose of this study is to evaluate the prevalence, amplitude, and extent of motion artifacts of the aorta in spiral CT and to specify the effects of acquisition and reconstruction parameters on these artifacts.
One hundred seventy-one thoracic spiral CT examinations were retrospectively analyzed by two reviewers. The analysis sought to determine the presence, location, amplitude, and extent of artifacts of the ascending aorta.
Aortic artifacts were detected on spiral CT in 57% of cases. The mean amplitude and mean extent were 4+/-4 and 6+/-7 mm, respectively. Artifacts in the ascending aorta were significantly higher with the 360 degrees linear interpolation (LI) algorithm than with the 180 degrees LI algorithm.
The prevalence of motion artifacts on spiral CT is higher in this study than the reported prevalence in incremental CT. However, this higher prevalence is significantly reduced when the 180 degrees LI algorithm is used.
升主动脉的运动伪影可能会损害图像质量，并模拟内膜瓣或假腔。本研究的目的是评估螺旋CT中主动脉运动伪影的发生率、幅度和范围，并明确采集和重建参数对这些伪影的影响。
两名研究者对171例胸部螺旋CT检查进行了回顾性分析。分析旨在确定升主动脉伪影的存在、位置、幅度和范围。
57%的病例在螺旋CT上检测到主动脉伪影。平均幅度和平均范围分别为4±4和6±7mm。与180度线性内插（LI）算法相比，360度LI算法时升主动脉的伪影明显更多。
本研究中螺旋CT上运动伪影的发生率高于增量CT报道的发生率。然而，使用180度LI算法时，这种较高的发生率会显著降低。
