MRI evaluation of the knee with non-ferromagnetic external fixators: cadaveric knee model.
MRI evaluation of the knee with non-ferromagnetic external fixators: cadaveric knee model.
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DOI：
10.1007/s00590-015-1655-9
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发表时间：
2015-07-01
期刊：
影响因子：
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通讯作者：
Cheng, Wayne K
中科院分区：
文献类型：
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作者：
Elsissy, Peter;Akpolat, Yusuf T;Cheng, Wayne K
简介：MRI兼容外固定器械的出现使得MRI在接受外固定治疗的患者中的应用成为可能。然而，尽管有多项研究确定了使用外固定支架器械进行MRI扫描的安全性，但没有研究确定这些器械可能对MRI图像产生的伪影影响。本研究旨在评价两种流行品牌（斯特赖克和Synthes）MRI兼容外固定器对膝关节MRI诊断能力的影响。我们假设，（1）MRI图像会有更高的噪声，由于存在的外固定器和（2）图像的高诊断能力，将获得在存在的每个外固定器跨越kenne.METHODS：使用7具尸体的膝盖，进行了一项研究，分析MRI图像中采取的存在每个外固定器。不使用外固定器的扫描作为对照。在五个解剖结构处测量信噪比（SNR）。将这些结构作为图像质量的定量测量进行比较。采用五点分级法进行定性分析，以评估金属伪影对图像质量的影响。每一次扫描分为三个盲肌肉骨骼放射科医生专注于六个关键的解剖结构。结果：减少信噪比确定外固定支架组相比，在髌骨肌腱，MM和PCL的对照组。三位放射科专家的定性评分显示，在识别斯特赖克、Synthes和对照图像之间的六个关键解剖标志的能力方面没有差异。结论：虽然外固定装置的存在确实增加了MRI扫描中的噪声伪影，但接受这些外固定器治疗的患者可以接受局部结构的MRI，获得诊断质量图像的可能性很高。
INTRODUCTION: The advent of MRI-compatible external fixation devices has made the use of MRI possible in patients who have been treated with external fixation. However, although there have been multiple studies determining the safety of MRI scans with external fixator devices, there are no studies determining the artifact effect these devices can have on the MRI image. The purpose of our study was to evaluate the effect of two popular brands (Stryker and Synthes) of MRI-compatible external fixators on the diagnostic capacity of a knee MRI. We hypothesize that (1) MRI images would have higher noise due to the presence of an external fixator and (2) images of high diagnostic capacity will be obtainable in the presence of each external fixator spanning the knee.METHODS: Using seven cadaveric knees, a study was performed to analyze MRI images taken in the presence each external fixator. Scans taken with no external fixator present served as controls. Signal-to-noise ratios (SNRs) were measured at five anatomic structures. These structures were compared as a quantitative measure of image quality. A qualitative analysis was also performed using a five-point grading scale to assess the influence of metal artifact on the quality of the images. Each scan was graded by three blinded musculoskeletal radiologists focusing on six key anatomic structures.RESULTS: A reduction in SNR was identified on the external fixator group compare to the control groups at the patella tendon, MM and PCL. Qualitative scoring by three expert radiologists showed no difference in ability to identify the six key anatomic landmarks between the Stryker, Synthes and control images.CONCLUSION: Although the presence of external fixation devices does increase the noise artifact in MRI scans, patients treated with these external fixators can undergo MRI of local structures with high likelihood of obtaining diagnostic quality images.