Department of Radiology, Hamamatsu University School of Medicine.
Department of Radiology, University of Yamanashi.
Magn Reson Med Sci. 2023 Apr 1;22(2):221-231. doi: 10.2463/mrms.mp.2021-0143. Epub 2022 Mar 17.
To compare the quality of dynamic imaging between stack-of-stars acquisition without breath-holding (DISCO-Star) and the breath-holding method (Cartesian LAVA and DISCO).
This retrospective study was conducted between October 2019 and February 2020. Two radiologists performed visual assessments of respiratory motion or pulsation artifacts, streak artifacts, liver edge sharpness, and overall image quality using a 5-point scale for two datasets: Dataset 1 (n = 107), patients with Cartesian LAVA and DISCO-Star; Dataset 2 (n = 41), patients with DISCO and DISCO-Star at different time points. Diagnosable image quality was defined as ≥ 3 points in overall image quality. Whether the scan timing of the arterial phase (AP) was appropriate was evaluated, and results between the pulse sequences were compared. In cases of inappropriate scan timing in the DISCO-Star group, retrospective reconstruction with a high frame rate (80 phases, 3 s/phase) was added.
The overall image quality of Cartesian LAVA was better than that of DISCO-Star in AP. However, noninferiority was shown in the ratio of diagnosable images between Cartesian LAVA and DISCO-Star in AP. There was no significant difference in the ratio of appropriate scan timing between DISCO-Star and Cartesian LAVA; however, the ratio of appropriate scan timing in DISCO-Star with high frame rate reconstruction was significantly higher than that in Cartesian LAVA in both readers. Overall image quality scores between DISCO and DISCO-Star were not significantly different in AP. There was no significant difference in the ratio of appropriate scan timing between DISCO-Star with high frame rate reconstruction and DISCO in both readers.
The use of DISCO-Star with high frame rate reconstruction is a good solution to obtain appropriate AP scan timing compared with Cartesian LAVA. DISCO-Star showed equivalent image quality in all phases and in the ratio of appropriate AP scan timing compared with DISCO.
比较不屏息（DISCO-Star）和屏息（Cartesian LAVA 和 DISCO）采集的星堆动态成像质量。
本回顾性研究于 2019 年 10 月至 2020 年 2 月进行。两名放射科医生使用 5 分制对两个数据集的呼吸运动或搏动伪影、条纹伪影、肝缘锐利度和整体图像质量进行视觉评估：数据集 1（n=107），接受 Cartesian LAVA 和 DISCO-Star 的患者；数据集 2（n=41），不同时间点接受 DISCO 和 DISCO-Star 的患者。可诊断的图像质量定义为整体图像质量≥3 分。评估动脉期（AP）的扫描时间是否合适，并比较脉冲序列之间的结果。在 DISCO-Star 组扫描时间不合适的情况下，添加高帧率（80 期，3 秒/期）的回顾性重建。
AP 时，Cartesian LAVA 的整体图像质量优于 DISCO-Star。然而，AP 时，Cartesian LAVA 和 DISCO-Star 的可诊断图像比例显示非劣效性。DISCO-Star 和 Cartesian LAVA 的合适扫描时间比例无显著差异；然而，在两位读者中，具有高帧率重建的 DISCO-Star 的合适扫描时间比例均显著高于 Cartesian LAVA。AP 时，DISCO 和 DISCO-Star 的整体图像质量评分无显著差异。在两位读者中，具有高帧率重建的 DISCO-Star 与 DISCO 的合适扫描时间比例无显著差异。
与 Cartesian LAVA 相比，使用高帧率重建的 DISCO-Star 是获得合适 AP 扫描时间的好方法。在所有相位和 AP 扫描时间合适的比例上，DISCO-Star 与 DISCO 显示出相当的图像质量。
