MRI of the pelvis at 3 T: very high spatial resolution with sensitivity encoding and flip-angle sweep technique in clinically acceptable scan time
MRI of the pelvis at 3 T: very high spatial resolution with sensitivity encoding and flip-angle sweep technique in clinically acceptable scan time
复制标题
3 T 骨盆 MRI：非常高的空间分辨率，具有灵敏度编码和翻转角扫描技术，扫描时间在临床可接受的范围内
作者：
N. Morakkabati;J. Gieseke;C. Kuhl;G. Lutterbey;M. Falkenhausen;F. Träber;T. Park;O. Zivanovic;H. Schild
目的 3.0-T 的更高信号可以提高空间分辨率，而不会损失图像质量。我们评估了具有高空间分辨率 (3T-HR) 的 T2 加权涡轮自旋回波序列，以确定这是否提供临床上有用的盆腔 MRI。材料和方法我们设计了一个具有高空间分辨率 (3T-HR) (0.45×0.46×4 mm) 的序列，该序列与并行成像和可变重聚焦角度技术 (8.06 分钟) 相结合。我们使用 3T-HR 和标准序列（3T-SP；4.03 分钟；相当于 1.5 T）检查了 23 名患有妇科疾病的患者。两名放射科医生分析了组织对比度、信噪比、细节描绘和伪影水平。结果组织对比度和信噪比被评定为相等。尽管 3T-HR 的扫描时间较长，但 3T-SP 更容易出现运动伪影。更高的空间分辨率为四名患者提供了额外的信息。在两名患者中检测到小肌瘤，在一名患者中检测到明显的淋巴结转移，在一名患者中 3T-HR 排除了肿瘤侵袭。结论 在可接受的扫描时间内，可以在 3T 下获得具有高图像质量的高空间分辨率盆腔研究。 3 T 下可行的更高空间分辨率还提供了更多临床相关信息。
ObjectiveThe higher signal at 3.0-T allows spatial resolution to be increased without loss in image quality. We evaluated a T2-weighted turbo spin-echo sequence with high spatial resolution (3T-HR) to determine whether this provides clinically useful pelvic MRI.Materials and methodsWe designed a sequence with high spatial resolution (3T-HR) (0.45×0.46×4 mm) that was combined with parallel imaging and the variable refocusing angle technique (8.06 min). We examined 23 patients with gynecological disorders using 3T-HR and a standard sequence (3T-SP; 4.03 min; equivalent to 1.5 T). Two radiologists analyzed tissue contrast, signal to noise, detail delineation and artifact level.ResultsTissue contrasts and signal to noise were rated equal. Motion artifacts occurred more often with 3T-SP despite the longer scanning time of 3T-HR. The higher spatial resolution provided additional information in four patients. In two patients small myomas were detected, in one patient a lymph node metastasis was apparent, and in one patient 3T-HR excluded tumor invasion.ConclusionsHigh spatial resolution pelvic studies with high image quality can be obtained at 3 T in acceptable scan time. The higher spatial resolution that is feasible at 3 T also provides more clinically relevant information.