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T1ρ与关节软骨特性的相关性取决于自旋锁定幅度和样本方向。

Correlations of T1ρ With Properties of Articular Cartilage Depend on the Spin-Lock Amplitude and Orientation of the Sample.

作者信息

Hänninen Nina E, Stavenuiter Isabel, Nykänen Olli, Nissi Mikko J

机构信息

Department of Technical Physics, University of Eastern Finland, Kuopio, Finland.

Wellbeing Services County of North Savo, Kuopio University Hospital, Kuopio, Finland.

出版信息

J Orthop Res. 2025 May 7. doi: 10.1002/jor.26094.

Abstract

Various findings on the correlations of the continuous wave (CW-) T1ρ relaxation with properties of articular cartilage have been reported, suggesting its potential for cartilage diagnostics. The aim of the study was to combine all the previously reported aspects and investigate the association of CW-T1ρ relaxation time in healthy bovine cartilage to different properties of cartilage with a range of spin-lock amplitudes and cartilage orientations. Bovine cartilage-bone plugs (n = 11) were imaged in four orientations at 9.4T to measure T1, T2, and CW-T1ρ with spin-lock amplitudes varying between 100 and 5000 Hz. For reference, biomechanical moduli, polarized light microcopy anisotropy and optical density were measured. Correlation between the relaxation times and the reference parameters were determined for each spin-lock amplitude and sample orientation. Significant increase in both CW-T1ρ and T2 relaxation times was observed, especially in the deep layers of cartilage, when the sample was oriented to 55° orientation. The CW-T1ρ relaxation anisotropy was reduced with increasing spin-lock amplitude and reached a stable level of about 10% at a spin-lock amplitude of 1500 Hz or higher. Young's modulus, instantaneous modulus and optical density correlated negatively with the T1ρ relaxation times measured with spin-lock amplitudes higher than 500 Hz. The results demonstrate that CW-T1ρ relaxation time is highly dependent on the orientation of cartilage with respect to the main magnetic field (B), and the level of orientation dependence is related to the spin-lock amplitude. Correlation of CW-T1ρ with cartilage properties is dependent both on the orientation and spin-lock amplitude.

摘要

关于连续波(CW-)T1ρ弛豫与关节软骨特性之间的相关性已有各种研究结果报道,这表明其在软骨诊断方面具有潜力。本研究的目的是整合所有先前报道的方面,并研究健康牛软骨中CW-T1ρ弛豫时间与不同软骨特性之间的关联,这些特性包括一系列自旋锁定幅度和软骨取向。在9.4T磁场下,对牛软骨-骨栓(n = 11)在四个取向上进行成像,以测量T1、T2和CW-T1ρ,自旋锁定幅度在100至5000Hz之间变化。作为参考,还测量了生物力学模量、偏振光显微镜各向异性和光密度。针对每个自旋锁定幅度和样品取向,确定了弛豫时间与参考参数之间的相关性。当样品取向为55°时,观察到CW-T1ρ和T2弛豫时间均显著增加,尤其是在软骨深层。随着自旋锁定幅度的增加,CW-T1ρ弛豫各向异性降低,在自旋锁定幅度为1500Hz或更高时达到约10%的稳定水平。杨氏模量、瞬时模量和光密度与自旋锁定幅度高于500Hz时测量的T1ρ弛豫时间呈负相关。结果表明,CW-T1ρ弛豫时间高度依赖于软骨相对于主磁场(B)的取向,且取向依赖程度与自旋锁定幅度有关。CW-T1ρ与软骨特性的相关性既取决于取向也取决于自旋锁定幅度。

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