Department of Oral and Maxillofacial Radiology, Tokyo Dental College, Chiba City, Chiba, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2013 Jan;115(1):114-20. doi: 10.1016/j.oooo.2012.09.083.
The aim of this study was to elucidate possible elements in minimal amounts of fluid (MF) in the temporomandibular joint by analyzing signal intensities in T2-weighted and fluid-attenuated inversion recovery (FLAIR) magnetic resonance (MR) images.
Fifteen joints (15 patients) with MF were subjected to MR imaging to obtain T2-weighted and FLAIR images. Regions of interest were placed on MF, cerebrospinal fluid (CSF), and gray matter (GM), and their signal intensities were measured on both images. The signal intensity ratio (SIR) obtained by the signal intensity of GM between MF and CSF was compared in T2-weighted and FLAIR images.
The average SIR of MF was lower than that of CSF on T2-weighted images, whereas it was higher on FLAIR images. The average suppression ratio of the signal intensity was lower for MF (24.1%) than for CSF (71.4%).
MF may contain elements such as protein that are capable of inducing a shortened T1 relaxation time on MR images.
本研究旨在通过分析 T2 加权和液体衰减反转恢复（FLAIR）磁共振（MR）图像中的信号强度，阐明颞下颌关节中微量积液（MF）中可能存在的成分。
对 15 个关节（15 例患者）的 MF 进行 MR 成像，以获得 T2 加权和 FLAIR 图像。在 MF、脑脊液（CSF）和灰质（GM）上放置感兴趣区，并在两种图像上测量其信号强度。比较 T2 加权和 FLAIR 图像中 GM 与 CSF 之间 MF 的信号强度比（SIR）。
T2 加权图像中 MF 的平均 SIR 低于 CSF，而 FLAIR 图像中 MF 的平均 SIR 高于 CSF。MF 的信号强度抑制率（24.1%）低于 CSF（71.4%）。
MF 可能含有蛋白质等物质，这些物质能够在 MR 图像中引起 T1 弛豫时间缩短。
