Evaluation of diffusion parameters and T2 values of the masseter muscle during jaw opening, clenching, and rest

Tomoko Shiraishi, Toru Chikui, Daisuke Inadomi, Toyohiro Kagawa, Kazunori Yoshiura, Kenji Yuasa

研究成果: Contribution to journalArticle査読

5 被引用数 (Scopus)


Background: Diffusion-weighted imaging (DWI) and diffusion-tensor imaging (DTI) can be used to evaluate changes that accompany skeletal muscle contraction. Purpose: To investigate whether jaw opening or closure affect the diffusion parameters of the masseter muscles (MMs). Material and Methods: Eleven healthy volunteers were evaluated. Diffusion-tensor images were acquired to obtain the primary (λ 1), secondary (λ 2), and tertiary eigenvalues (λ 3). We estimated these parameters at three different locations: at the level of the mandibular notch for the superior site, the level of the mandibular foramen for the middle site, and the root apex of the mandibular molars for the inferior site. Results: Both λ 2 and λ 3 during jaw opening were significantly lower than that at rest at the superior (P = 0.006, P,< 0.0001, respectively) and middle site (P = 0.004, P = 0.0001, respectively); however, the change in λ 1 was not significant. At the lower site, no parameter was significantly different at rest and during jaw opening. There was no significant difference in T2 between at rest (40.3±4.4 ms) and during jaw opening (39.2±2.7 ms; P = 0.12). The changes induced by jaw closure were marked at the inferior site. In the middle and inferior sites, the three eigenvalues were increased by jaw closure, and the changes in λ 1 (P = 0.0145, P = 0.0107, respectively) and λ 2 (P = 0.0003, P = 0.0001) were significant (especially λ 2). Conclusion: The eigenvalues for diffusion of the MM were sensitive to jaw position. The recruitment of muscle fibers, specific to jaw position, reflects the differences in changes in muscle diffusion parameters.

ジャーナルActa Radiologica
出版ステータス出版済み - 2 2012

All Science Journal Classification (ASJC) codes

  • 放射線技術および超音波技術
  • 放射線学、核医学およびイメージング


「Evaluation of diffusion parameters and T2 values of the masseter muscle during jaw opening, clenching, and rest」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。