PROPELLER Technique to Improve Image Quality of MRI of the Shoulder
PROPELLER Technique to Improve Image Quality of MRI of the Shoulder
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DOI：
10.2214/ajr.10.6065
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发表时间：
2011-12-01
影响因子：
5
通讯作者：
Pfirrmann, Christian W. A.
中科院分区：
文献类型：
--
作者：
Dietrich, Tobias J.;Ulbrich, Erika J.;Pfirrmann, Christian W. A.
目标。本文的目的是评价周期性旋转重叠平行线增强重建(PROPELLER)技术在肩关节中加权和T2加权MRI中的伪影减少和整体图像质量改善中的应用。研究对象包括111名接受肩关节磁共振造影术的患者。在无标准TSE序列的基础上，采用螺旋桨技术，获得了具有脂肪抑制的冠状倾斜中加权快速自旋回波(TSE)序列和具有脂肪抑制的矢状倾斜T2加权TSE序列。螺旋桨扫描时间从3分17秒增加到4分17秒(冠状斜面)，从2分52秒增加到4分10秒(矢状面)。两位放射科医生对图像伪影、整体图像质量和几个解剖结构的勾画进行了5分制评分(5分，无伪影，最佳诊断质量；1分，严重伪影，诊断不可用)。结果：螺旋桨图像中的运动伪影明显减少(p<；0.001)。观察者1在冠状倾斜螺旋桨图像上对1名患者的运动伪影进行了诊断损害评级，而在标准图像上为33名患者。在整体图像质量方面，带有螺旋桨的序列的评分要好得多(p<；0.001)。观察者1注意到，在矢状位倾斜螺旋桨图像上，9名患者的总体图像质量与标准MRI上的23名患者相比，具有诊断损害的图像质量。结论：肩部MRI的PROPER技术减少了由于运动伪影而导致的诊断损害序列的数量，并与标准TSE序列相比提高了图像质量。螺旋桨序列增加了捕获时间。
OBJECTIVE. The purpose of this article is to evaluate the use of the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) technique for artifact reduction and overall image quality improvement for intermediate-weighted and T2-weighted MRI of the shoulder.SUBJECTS AND METHODS. One hundred eleven patients undergoing MR arthrography of the shoulder were included. A coronal oblique intermediate-weighted turbo spin-echo (TSE) sequence with fat suppression and a sagittal oblique T2-weighted TSE sequence with fat suppression were obtained without (standard) and with the PROPELLER technique. Scanning time increased from 3 minutes 17 seconds to 4 minutes 17 seconds (coronal oblique plane) and from 2 minutes 52 seconds to 4 minutes 10 seconds (sagittal oblique) using PROPELLER. Two radiologists graded image artifacts, overall image quality, and delineation of several anatomic structures on a 5-point scale (5, no artifact, optimal diagnostic quality; and 1, severe artifacts, diagnostically not usable). The Wilcoxon signed rank test was used to compare the data of the standard and PROPELLER images.RESULTS. Motion artifacts were significantly reduced in PROPELLER images (p < 0.001). Observer 1 rated motion artifacts with diagnostic impairment in one patient on coronal oblique PROPELLER images compared with 33 patients on standard images. Ratings for the sequences with PROPELLER were significantly better for overall image quality (p < 0.001). Observer 1 noted an overall image quality with diagnostic impairment in nine patients on sagittal oblique PROPELLER images compared with 23 patients on standard MRI.CONCLUSION. The PROPELLER technique for MRI of the shoulder reduces the number of sequences with diagnostic impairment as a result of motion artifacts and increases image quality compared with standard TSE sequences. PROPELLER sequences increase the acquisition time.