Department of Radiology, University of Yamanashi.
Department of Diagnostic Radiology, Kofu Kyoritsu Hospital.
Magn Reson Med Sci. 2021 Sep 1;20(3):280-289. doi: 10.2463/mrms.mp.2020-0064. Epub 2020 Aug 28.
To investigate whether shortened acquisition or multiple arterial phase acquisition improves image quality of the arterial phase compared with conventional protocol.
This retrospective study was approved by the relevant Institutional Review Board. A total of 615 consecutive patients who underwent gadoxetate disodium-enhanced MRI including one of the following three sequences in three different periods were included: (i) conventional liver acquisition with volume acceleration (LAVA) (between October 2014 and January 2015, n = 149), (ii) Turbo-LAVA (between March and August 2016, n = 216), and (iii) differential sub-sampling with Cartesian ordering (DISCO) (between January and September 2015, n = 250). We monitored the respiratory bellows waveform during breath holding for each patient and recorded breath-hold fidelity of the patients. Two radiologists independently evaluated the degree of respiratory artifact and scan timing on the arterial phase and compared them between the three protocols (i.e., conventional LAVA, Turbo-LAVA, and DISCO), with conventional LAVA as control.
The ratio of patients with breath-hold failure was not significantly different among the three protocols (P = 0.6340 and 0.1085). Respiratory artifact was significantly lower in DISCO than in conventional LAVA (P = 0.0424), while there was no significant difference between Turbo-LAVA and conventional LAVA (P = 0.2593). The ratio of adequate scan timing and diagnosable image defined as no or mild artifact and adequate scan timing were higher in DISCO than in conventional LAVA (P = 0.0025 and 0.0019), while there was no significant difference between Turbo-LAVA and conventional LAVA (P = 0.0780 and 0.0657).
Compared with conventional protocol, multiple arterial phase acquisition (DISCO) obtained a higher number of diagnosable images by reducing respiratory motion artifact and optimizing the scan timing of arterial phase.
研究缩短采集时间或多次动脉期采集是否比常规方案更能提高动脉期图像质量。
本回顾性研究经相关机构审查委员会批准。共纳入 615 例连续接受钆塞酸二钠增强 MRI 检查的患者，这些患者在三个不同时期分别接受以下三种序列中的一种：（i）传统肝脏容积加速采集（LAVA）（2014 年 10 月至 2015 年 1 月，n = 149）；（ii）Turbo-LAVA（2016 年 3 月至 8 月，n = 216）；（iii）笛卡尔排序的差分子采样（DISCO）（2015 年 1 月至 9 月，n = 250）。我们监测了每位患者屏气过程中的呼吸风箱波形，并记录了患者屏气的保真度。两名放射科医生独立评估了动脉期的呼吸伪影程度和扫描时间，并将这三个方案（即传统 LAVA、Turbo-LAVA 和 DISCO）与常规 LAVA 进行比较。
三个方案中呼吸失败的患者比例无显著差异（P = 0.6340 和 0.1085）。与传统 LAVA 相比，DISCO 的呼吸伪影明显更低（P = 0.0424），而 Turbo-LAVA 与传统 LAVA 之间无显著差异（P = 0.2593）。DISCO 的适当扫描时间和可诊断图像的比例高于传统 LAVA（无或轻度伪影且扫描时间适当）（P = 0.0025 和 0.0019），而 Turbo-LAVA 与传统 LAVA 之间无显著差异（P = 0.0780 和 0.0657）。
与常规方案相比，多次动脉期采集（DISCO）通过减少呼吸运动伪影和优化动脉期扫描时间，获得了更高比例的可诊断图像。
