The Osteoarthritis Initiative (OAI) magnetic resonance imaging quality assurance update.
The Osteoarthritis Initiative (OAI) magnetic resonance imaging quality assurance update.
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DOI：
10.1016/j.joca.2012.10.011
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发表时间：
2013-01
影响因子：
7
通讯作者：
Nessaiver M
中科院分区：
文献类型：
--
作者：
Schneider E;Nessaiver M
软骨疾病的纵向定量评估需要随着时间的推移进行可重复性的测量。我们报告了8年来骨关节炎倡议(OAI)的定量磁共振(MR)膝关节分析的质量保证(QA)指标，并展示了MR系统、体模和采集方案变化的影响。使用自动化程序每月在两个不同的模体上量化关键的3T磁共振QA指标，包括信噪比、信号一致性、T2弛豫时间和几何失真。在8年多的时间里，体模测量的均方根变异系数重复性为<；0.25%(直径190.0 mm)和<；0.20%(长度148.0 mm)，导致球体体积重复性为<；0.35%。T2弛豫时间重复性在1.5%~5.3%之间变化；在两个部位观察到季节性波动。所有其他质量保证目标都达到了，除了：在涡轮自旋回波图像上，切片厚度始终大于标称厚度；膝关节线圈信号的一致性和信号电平随着时间的推移而变化很大。球体体积的纵向变化对软骨体积和厚度测量的准确性和重复性的影响应该最小，因为它们比报告的未配对或配对(重新定位和重新分析)精度误差小一个数量级。这种稳定性应该能够直接比较基线图像和后续图像。对所有四个OAI站点的几何结果进行交叉比较表明，MR系统在统计上没有差异，可以将结果汇集在一起。QA先生的结果发现了与之前发表的类似的技术问题。几何精度稳定性对定量分析软骨体积纵向变化和厚度精度的影响最大。
Longitudinal quantitative evaluation of cartilage disease requires reproducible measurements over time. We report 8 years of quality assurance (QA) metrics for quantitative magnetic resonance (MR) knee analyses from the Osteoarthritis Initiative (OAI) and show the impact of MR system, phantom, and acquisition protocol changes. Key 3 T MR QA metrics, including signal-to-noise, signal uniformity, T2 relaxation times, and geometric distortion, were quantified monthly on two different phantoms using an automated program. Over 8 years, phantom measurements showed root-mean-square coefficient-of-variation reproducibility of <0.25% (190.0 mm diameter) and <0.20% (148.0 mm length), resulting in spherical volume reproducibility of <0.35%. T2 relaxation time reproducibility varied from 1.5% to 5.3%; seasonal fluctuations were observed at two sites. All other QA goals were met except: slice thicknesses were consistently larger than nominal on turbo spin echo images; knee coil signal uniformity and signal level varied significantly over time. The longitudinal variations for a spherical volume should have minimal impact on the accuracy and reproducibility of cartilage volume and thickness measurements as they are an order of magnitude smaller than reported for either unpaired or paired (repositioning and reanalysis) precision errors. This stability should enable direct comparison of baseline and follow-up images. Cross-comparison of the geometric results from all four OAI sites reveal that the MR systems do not statistically differ and enable results to be pooled. MR QA results identified similar technical issues as previously published. Geometric accuracy stability should have the greatest impact on quantitative analysis of longitudinal change in cartilage volume and thickness precision.
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影响因子：
3.8
作者：
Gunter, Jeffrey L.;Bernstein, Matt A.;Jack, Clifford R.
通讯作者：
Jack, Clifford R.
影响因子：
27.4
作者：
Hunter, D. J.;Niu, J.;Beals, C. R.
通讯作者：
Beals, C. R.
DOI：
10.1002/cmr.10012
发表时间：
2002-03-01
期刊：
CONCEPTS IN MAGNETIC RESONANCE
影响因子：
--
作者：
De Wilde, J;Price, D;Kitney, R
通讯作者：
Kitney, R
影响因子：
2.5
作者：
KEEVIL, SF;BARBIROLI, B;PODO, F
通讯作者：
PODO, F
影响因子：
2.1
作者：
Welsch, Goetz H.;Mamisch, Tallal C.;Trattnig, Siegfried
通讯作者：
Trattnig, Siegfried