Kanki Akihiko, Tamada Tsutomu, Abe Toshinori, Ikenaga Hiroyuki, Yoshida Koji, Ito Katsuyoshi
Department of Radiology, Kawasaki Medical School, 577 Matsushima, Kurashiki City, Okayama 701-0192, Japan.
Magn Reson Imaging. 2018 Nov;53:77-81. doi: 10.1016/j.mri.2018.06.022. Epub 2018 Jul 10.
To clarify the relationship between transient sever motion artifact in arterial phase (TSMA) and changes in peripheral capillary oxygen saturation (SpO) and heart rate (HR) after contrast media administration during MRI or CT of the liver.
87 patients undergoing 61 MRI examination with gadoxetic acid or 26 CT examination with iodinated contrast were included. Dynamic contrast-enhanced imaging (DCEI) was obtained at four vascular phase acquisitions. Reviewers extracted the segmental data of SpO and HR in each phase from consecutive data in DCE-CT or DCE-MRI. In addition, reviewers scored for respiratory motion in each phase using 5-point scale. Patients with an arterial score of 4-5, and other phase scores of 1-2 were considered to be exhibiting TSMA.
In gadoxetic acid, mean SpO of arterial phase was significantly lower than three other phases (P = 0.045 to P < 0.001). However, the decrease in SpO in arterial phase compared with other phases was <1%. Mean HR in gadoxetic acid or iodinated contrast agent was highest in the portal-phase. The incidence of TSM was 0% in patients with iodinated contrast agent and was 8.2% (5/61 patients; TSM group) in patients with gadoxetic acid, respectively. In addition, there was no significant difference in mean SpO of arterial phase between the TSM group (97.5% ± 1.08%) and non-TSM group (96.4% ± 1.85%) (P = 0.219).
The slight decrease in SpO in arterial phase is not associated with TSMA.
阐明肝脏MRI或CT检查中，动脉期短暂严重运动伪影（TSMA）与造影剂注射后外周毛细血管血氧饱和度（SpO）及心率（HR）变化之间的关系。
纳入87例患者，其中61例行钆塞酸增强MRI检查，26例行碘造影剂增强CT检查。在四个血管期采集动态对比增强成像（DCEI）。阅片者从DCE-CT或DCE-MRI的连续数据中提取各期SpO和HR的节段数据。此外，阅片者使用5分制对各期呼吸运动进行评分。动脉期评分为4-5分且其他期评分为1-2分的患者被认为存在TSMA。
在钆塞酸增强检查中，动脉期平均SpO显著低于其他三期（P = 0.045至P < 0.001）。然而，动脉期SpO较其他期的下降幅度<1%。钆塞酸增强或碘造影剂增强检查中，平均HR在门脉期最高。碘造影剂增强检查患者的TSM发生率为0%，钆塞酸增强检查患者的TSM发生率为8.2%（5/61例患者；TSM组）。此外，TSM组（97.5% ± 1.08%）与非TSM组（96.4% ± 1.85%）动脉期平均SpO无显著差异（P = 0.219）。
动脉期SpO的轻微下降与TSMA无关。
