Metal Artifact Reduction With MAVRIC SL at 3-T MRI in Patients With Hip Arthroplasty
Metal Artifact Reduction With MAVRIC SL at 3-T MRI in Patients With Hip Arthroplasty
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DOI：
10.2214/ajr.13.11785
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发表时间：
2015-01-01
影响因子：
5
通讯作者：
Gold, Garry E.
中科院分区：
文献类型：
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作者：
Choi, Soo-Jung;Koch, Kevin M.;Gold, Garry E.
目标。我们的研究目的是比较多采集可变共振图像组合选择(MAVRIC SL)序列和2D快速自旋回波(FSE)序列在3-T磁共振髋关节置换术(HA)患者金属伪影修复中的应用。研究组包括19例HA患者21个髋关节的2D FSE和MAVRIC SL图像。评估了21个髋关节的配对图像集，包括13个冠状位切片和12个轴位切片(共25个图像集)。为了进行定量分析，在髋部和股骨水平测量伪影面积。在定性分析方面，两位肌肉骨骼放射科医生独立比较了成对的2D FSE和MAVRIC SL在伪影、解剖细节描述、诊断置信度和异常发现检测方面的差异。结果：在髋关节(MAVRIC SL减少了59.9%)和股骨(MAVRIC SL减少了31.3%)水平，MAVRIC SL测量到的伪影面积明显小于2D FSE(P<；0.05)。与2D FSE相比，两位评价者的MAVRICSL伪影得分也显著降低(p<；0.0001)。与2D FSE相比，MAVRIC SL能更好地显示髋关节包膜、闭孔外肌和髂腰肌的肌腱附着点(p<；0.0125)。结论：与2D FSE序列相比，MAVRIC SL序列能显著减少3TMRI上的金属伪影，提高3TMRI诊断THA的可信度。
OBJECTIVE. The objective of our study was to compare the multiacquisition variable-resonance image combination selective (MAVRIC SL) sequence with the 2D fast spin-echo (FSE) sequence for metal artifact reduction on 3-T MRI in patients with hip arthroplasty (HA).MATERIALS AND METHODS. Matched 2D FSE and MAVRIC SL images of 21 hips (19 patients with HA) were included in the study group. Paired image sets, composed of 13 coronal and 12 axial slices (total, 25 image sets), of the 21 hips were evaluated. For quantitative analysis, the artifact area was measured at the level of the hip and femur. For qualitative analysis, two musculoskeletal radiologists independently compared paired 2D FSE and MAVRIC SL sets in terms of artifacts, depiction of anatomic detail, level of diagnostic confidence, and detection of abnormal findings.RESULTS. The measured artifact area was significantly smaller (p < 0.05) on MAVRIC SL than 2D FSE at both the level of hip (59.9% reduction with MAVRIC SL) and femur (31.3% reduction with MAVRIC SL). The artifact score was also significantly decreased (p < 0.0001) with MAVRIC SL compared with 2D FSE for both reviewers. The hip joint capsule and the muscle and tendon attachment sites of the obturator externus and iliopsoas muscles were better depicted with MAVRIC SL than 2D FSE (p < 0.0125). Abnormal findings were significantly better shown on MAVRIC SL imaging compared with 2D FSE imaging (p < 0.0001).CONCLUSION. The MAVRIC SL sequence can significantly reduce metal artifact on 3-T MRI compared with the 2D FSE sequence and can increase diagnostic confidence of 3-T MRI in patients with total HA.