Ultrashort time-to-echo quantitative magnetic resonance imaging of the triangular fibrocartilage: differences in position
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To compare T2* values of the triangular fibrocartilage (TFC) obtained by ultrashort time-to-echo (UTE) techniques at the neutral position, ulnar flexion of the wrist, and pronation of the forearm.
Materials and methods
MR imaging was performed in ten healthy volunteers with a 3-T MR system by using an eight-channel knee coil. Coronal wrist T2* maps from three-dimensional cone UTE pulse sequences were obtained at the neutral, ulnar flexion, and pronation positions (TR: 19 ms, TE: 0.032 ms/4 ms/8 ms/12 ms, FOV: 18 cm, matrix: 430 × 430, section thickness: 1.5 mm, scan time: 8 min 31 s). UTE-T2* maps were calculated on a pixel-by-pixel basis for all structures of the wrist visualized in the coronal planes. The entire region of interest (ROI) for TFC was manually delineated, and the average T2* value was calculated for each ROI by three radiologists. The Kruskal-Wallis test, Wilcoxon signed-rank test, or intraclass correlation coefficients (ICC) were used for statistics.
The difference in the average T2* value among the three groups according to the forearm/wrist position was significant (p < 0.001). The T2* value of the TFC at pronation (mean ± 2 SD: 7.92 ± 1.37 ms) was significantly lower than those at the neutral (10.08 ± 1.90 ms) and ulnar flexion positions (9.15 ± 1.03 ms) (p < 0.017). The ICC showed a substantial interobserver agreement in the T2* value measurements of the TFC (ICC = 0.986).
T2* relaxation time measurement of the TFC using UTE may be useful for assessing the loading effect by the forearm/wrist position.
• The T2* value of the TFC may reflect the biomechanics of the wrist joint.
• Acute loading at pronation results in a decrease in the T2* value of the TFC.
• Quantitative wrist UTE MRI was successfully performed in vivo.
KeywordsMagnetic resonance imaging Triangular fibrocartilage Joints Wrist Pronation
Diameter spherical volume
Field of view
Intraclass correlation coefficients
Magnetic resonance imaging
Entire region of interest
Time to echo
Triangular fibrocartilage complex
The authors state that this work has not received any funding.
Compliance with ethical standards
The scientific guarantor of this publication is Takatoshi Aoki.
Conflict of interest
The coauthor Atsushi Nozaki is an employee of GE Healthcare, the supplier of the MR unit and pulse sequence used in this study.
Statistics and biometry
No complex statistical methods were necessary for this paper.
Written informed consent was obtained from all subjects (patients) in this study.
Institutional Review Board approval was obtained.
• performed at one institution
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