MRI of Hip Arthroplasties: Comparison of Isotropic Multiacquisition Variable-Resonance Image Combination Selective (MAVRIC SL) Acquisitions With a Conventional MAVRIC SL Acquisition.
MRI of Hip Arthroplasties: Comparison of Isotropic Multiacquisition Variable-Resonance Image Combination Selective (MAVRIC SL) Acquisitions With a Conventional MAVRIC SL Acquisition.
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DOI：
10.2214/ajr.19.21606
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发表时间：
2019-08
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影响因子：
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通讯作者：
Kelly C Zochowski;Mauro A. Miranda;Jacky Cheung;E. Argentieri;B. Lin;S. Kaushik;A. Burge;H. Potter;M. Koff
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文献类型：
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作者：
Kelly C Zochowski;Mauro A. Miranda;Jacky Cheung;E. Argentieri;B. Lin;S. Kaushik;A. Burge;H. Potter;M. Koff
OBJECTIVE.我们研究的目的是比较以下三种金属伪影减少序列在评价髋关节置换术中的质量和诊断效用：传统多采集可变共振图像组合选择性（MAVRIC SL）、各向同性MAVRIC SL和减少TR各向同性MAVRIC SL。主题和方法。对84例患者（38例男性和46例女性;平均年龄± SD，69.1 ± 9.7岁）的93例髋关节置换术（85例全髋关节置换术和8例髋关节表面置换术[9例双侧髋关节]）进行了成像和评价。校准扫描确定了每个植入物所需的光谱箱数量，并采集了各向同性和传统MAVRIC SL图像。对40例关节置换术进行了减少TR各向同性MAVRIC SL扫描。两名对MRI采集设盲的经委员会认证的放射科医生评价了图像的临床和图像质量特征，并使用混合效应有序逻辑回归模型和比值比比较了图像。使用Gwet一致性系数评估评分员一致性。使用混合效应线性回归比较扫描时间。显著性设定为p < 0.05。结果校准扫描减少了所需的箱数（中位数，12个箱;四分位距，10-16个箱）。各向同性MAVRIC SL（平均扫描时间，7分16秒; 95% CI，7分7秒-7分25秒）采集的扫描时间最长，而常规采集的扫描时间最长。（平均值，5分46秒; 95% CI，5分37秒-5分55秒）和减少TR各向同性（5分28秒; 95% CI，5分15秒-5分41秒）MAVRIC SL采集的扫描时间相似。与传统MAVRIC SL图像相比，各向同性和减少TR的各向同性MAVRIC SL图像显示滑膜和假体周围骨的模糊减少和可视化改善（p < 0.001）。与减少TR的各向同性MAVRIC SL采集相比，各向同性MAVRIC SL采集更有效地改善了信噪比（SNR）、滑膜和假体周围骨的可视化以及病变的明显性，并减少了模糊（p < 0.032）。结论与传统MAVRIC SL采集相比，各向同性MAVRIC SL采集可改善SNR、病变的显著性以及滑膜和假体周围骨的可视化，并减少模糊。
OBJECTIVE. The objective of our study was to compare the quality and diagnostic utility of the following three metal artifact reduction sequences in evaluating hip arthroplasties: conventional multiacquisition variable-resonance image combination selective (MAVRIC SL), isotropic MAVRIC SL, and reduced-TR isotropic MAVRIC SL. SUBJECTS AND METHODS. Ninety-three hip arthroplasties (85 total hip replacements and eight hip resurfacings [nine bilateral hips]) in 84 patients (38 men and 46 women; mean age ± SD, 69.1 ± 9.7 years old) were imaged and evaluated. A calibration scan determined the number of spectral bins needed for each implant, and isotropic and conventional MAVRIC SL images were acquired. Reduced-TR isotropic MAVRIC SL scans were acquired for 40 arthroplasties. Two board-certified radiologists blinded to MRI acquisition evaluated images for clinical and image quality features and compared images using a mixed-effects ordinal logistic regression model and odds ratios. Rater agreement was assessed with Gwet agreement coefficients. Scanning times were compared using mixed-effects linear regression. Significance was set at p < 0.05. RESULTS. Calibration scans decreased the number of bins needed (median, 12 bins; interquartile range, 10-16 bins). Isotropic MAVRIC SL (mean scanning time, 7 minutes 16 seconds; 95% CI, 7 minutes 7 seconds-7 minutes 25 seconds) acquisitions had the longest scanning time, and conventional (mean, 5 minutes 46 seconds; 95% CI, 5 minutes 37 seconds-5 minutes 55 seconds) and reduced-TR isotropic (5 minutes 28 seconds; 95% CI, 5 minutes 15 seconds-5 minutes 41 seconds) MAVRIC SL acquisitions had scanning times that were similar. Both isotropic and reduced-TR isotropic MAVRIC SL images showed decreased blurring and improved visualization of the synovium and periprosthetic bone compared with conventional MAVRIC SL images (p < 0.001). Isotropic MAVRIC SL acquisitions more effectively improved signal-to-noise ratio (SNR), visualization of the synovium and periprosthetic bone, and lesion conspicuity and decreased blurring compared with reduced-TR isotropic MAVRIC SL acquisitions (p < 0.032). CONCLUSION. Isotropic MAVRIC SL acquisitions improve SNR, conspicuity of lesions, and visualization of synovium and periprosthetic bone and decrease blurring compared with conventional MAVRIC SL acquisitions.