Correlation of the near-infrared spectroscopy signals with signal intensity in T2-weighted magnetic resonance imaging of the human masseter muscle

Takuo Kuboki, Koji Suzuki, Kenji Maekawa, Mami Inoue-Minakuchi, Claver O. Acero, Yoshinobu Yanagi, Toru Wakasa, Kanji Kishi, Hirofumi Yatani, Glenn T. Clark

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The purpose of this study was to compare and contrast blood volume changes transcutaneously measured using near-infrared (NIR) spectroscopy against water signal intensity changes taken from a transverse T2-weighted MR image of the masseter muscle in healthy human subjects before, during and after contraction. Eight healthy non-smoking males with no history of chronic muscle pain or vascular headaches participated (mean age: 23.9 ± 0.6 years). The MRI data were gathered using a turbo spin echo sequence (TR: 2300 ms; TE: 90 ms; FOV: 188 × 300 mm; scanning time: 30 s; slice thickness: 10 mm) and the slice level was set at the mid-point between the origin and insertion of the masseter. Intramuscular haemoglobin (Hb) levels and water content of the right masseter muscle were continuously monitored for 2 min before, 30 s during and 15 min after a maximum voluntary clenching (MVC) task. Both the near-infrared and MRI data were baseline-corrected and normalized and mean levels were established and plotted. Plots of the data showed that both near-infrared-based total Hb and T2-weighted MRI-based signal-intensity levels clearly decreased during contraction and a clear post-contraction rebound response was evident after the contraction. The near-infrared data were found to be highly correlated with MRI-based signal-intensity data (Pearson's r = 0.909, P < 0.0001). In conclusion, these data provide powerful evidence that near-infrared data (total Hb), transcutaneously taken from the masseter muscle in humans, will reflect the intramuscular water signal intensity changes seen using a T2-weighted MRI imaging method.

Original languageEnglish
Pages (from-to)721-727
Number of pages7
JournalArchives of Oral Biology
Issue number8
Publication statusPublished - 2001


  • Intramuscular haemodynamics
  • Masseter muscle
  • Near-infrared spectroscopy
  • Signal intensity
  • T-weighted MRI

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Dentistry(all)
  • Cell Biology


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