BACKGROUND The optimal magnetic resonance angiography (MRA) sequence for assessing the aneurysm occlusion state or in-stent flow after endovascular coiling is not well established. OBJECTIVE To evaluate the diagnostic performance of pointwise encoding time reduction with radial acquisition (PETRA)-MRA in patients who underwent endovascular coiling relative to that of time-of-flight (TOF)-MRA and contrast-enhanced (CE)-MRA. METHODS We evaluated the aneurysm occlusion state using digital subtraction angiography (DSA) and MRA. In patients who underwent stent-assisted coiling, we estimated the visibility of in-stent flow. RESULTS We enrolled 189 patients with assessable TOF, PETRA, and CE-MRAs after coiling. In patients who underwent simple coiling (128 patients), PETRA showed a higher sensitivity in the detection of residual flow than TOF and CE (PETRA, 100%; CE, 83%; TOF, 80%). There were no significant differences in the height of residual flow between DSA (0.68 ± 1.45 mm) and PETRA (0.70 ± 1.50 mm; P = 1.000). In patients who underwent stent-assisted coiling (61 patients), PETRA showed the highest sensitivity (88%) in detecting residual flow (CE, 56%; TOF, 31%). Regarding in-stent flow, PETRA, CE, and TOF showed visual scores of ≥3 with frequencies of 96.7%, 85.2%, and 37.7%, respectively. Relative signal-to-noise ratio of PETRA (0.62 ± 0.18) was significantly higher than that of CE (0.56 ± 0.12) and TOF (0.39 ± 0.12; P < .001 for both). CONCLUSION PETRA-MRA showed excellent diagnostic performance in terms of residual flow detection and in-stent flow assessment. PETRA could be a versatile alternative sequence for following up patients with coiled aneurysm.

中文翻译：

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超短回波时间磁共振血管造影在血管内栓塞治疗颅内动脉瘤的随访中：飞行时间、径向采集的逐点编码时间减少和对比增强磁共振血管造影的比较

背景技术用于评估血管内弹簧圈栓塞后动脉瘤闭塞状态或支架内血流的最佳磁共振血管造影（MRA）序列尚未完全确定。目的 评估相对于飞行时间 (TOF)-MRA 和对比增强 (CE)-MRA 进行血管内弹簧圈栓塞术的患者，逐点编码时间减少与径向采集 (PETRA)-MRA 的诊断性能。方法 我们使用数字减影血管造影 (DSA) 和 MRA 评估动脉瘤闭塞状态。在接受支架辅助弹簧圈的患者中，我们估计了支架内血流的可见度。结果 我们招募了 189 名在卷曲后具有可评估 TOF、PETRA 和 CE-MRA 的患者。在接受简单线圈的患者（128 名患者）中，PETRA 在残留流量检测方面显示出比 TOF 和 CE 更高的灵敏度（PETRA，100%；CE，83%；TOF，80%）。DSA (0.68 ± 1.45 mm) 和 PETRA (0.70 ± 1.50 mm; P = 1.000) 之间的残余流高度没有显着差异。在接受支架辅助弹簧圈栓塞的患者（61 名患者）中，PETRA 在检测残留流量方面表现出最高的敏感性（88%）（CE，56%；TOF，31%）。关于支架内流量，PETRA、CE 和 TOF 的视觉评分≥3，频率分别为 96.7%、85.2% 和 37.7%。PETRA 的相对信噪比 (0.62 ± 0.18) 显着高于 CE (0.56 ± 0.12) 和 TOF (0.39 ± 0.12; P < .001)。结论 PETRA-MRA 在残留流量检测和支架内流量评估方面显示出出色的诊断性能。