Sakai Akinori
   Department   Wakamatsu Hospital of the University of Occupational and Environmental Health  Hospital President, Wakamatsu Hospital
   School of Medicine  Orthopedic Surgery, Clinical Medical Sciences
   Position  
Article types journal article
Language English
Peer review Peer reviewed
Title Ultrashort time-to-echo quantitative magnetic resonance imaging of the triangular fibrocartilage: differences in position.
Journal Formal name:European radiology
Abbreviation:Eur Radiol
ISSN code:14321084/09387994
Domestic / ForeginForegin
Volume, Issue, Page 46(12),2942-2953頁
Author and coauthor Fujisaki Akitaka, Aoki Takatoshi, Narimatsu Hidekuni, Kuwahara Chie, Nozaki Atsushi, Menuki Kunitaka, Sakai Akinori, Korogi Yukunori
Publication date 2018/09
Summary PURPOSE: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.RESULTS: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).CONCLUSION:T2* relaxation time measurement of the TFC using UTE may be useful for assessing the loading effect by the forearm/wrist position.KEY POINTS:• 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.
DOI 10.1007/s00330-018-5693-7
PMID 30178144