Document Detail

Magnetic resonance T2-weighted IDEAL water imaging for assessing changes in masseter muscles caused by low-level static contraction.
MedLine Citation:
PMID:  20346711     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The aim of this study was to clarify the changes, using magnetic resonance (MR) images, in the masseter muscles caused by low-level static contraction. STUDY DESIGN: Ten healthy male volunteers were enrolled in the study. The MR scans were performed before, immediately after, and 10 minutes after low-level static contraction. Two imaging sequences were acquired: a diffusion-weighted image and an iterative decomposition of water and fat with echo asymmetry and least-squares estimation (IDEAL) image. The apparent diffusion coefficient (ADC), the signal-to-noise ratio (SNR), and the thicknesses of the right and left masseter muscles were examined. RESULTS: The ADC and SNR immediately after exercise were significantly higher than those before exercise and 10 minutes after exercise. The muscles were significantly thicker immediately after exercise than before exercise and 10 minutes after exercise. CONCLUSION: We confirmed the presence of edema in the masseter muscles caused by low-level static contraction using MR images.
Yoshiko Ariji; Akira Taguchi; Shigemitsu Sakuma; Manabu Miki; Takayuki Asawa; Keiichi Uchida; Nobuo Yoshinari; Yuichiro Hiraiwa; Yoshitaka Kise; Masahiro Izumi; Munetaka Naitoh; Akitoshi Katsumata; Eiichiro Ariji
Publication Detail:
Type:  Evaluation Studies; Journal Article     Date:  2010-03-25
Journal Detail:
Title:  Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics     Volume:  109     ISSN:  1528-395X     ISO Abbreviation:  Oral Surg Oral Med Oral Pathol Oral Radiol Endod     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-10     Completed Date:  2010-08-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9508562     Medline TA:  Oral Surg Oral Med Oral Pathol Oral Radiol Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  908-16     Citation Subset:  D; IM    
Copyright Information:
Copyright 2010 Mosby, Inc. All rights reserved.
Department of Oral and Maxillofacial Radiology, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.
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MeSH Terms
Body Water / radiography*
Diffusion Magnetic Resonance Imaging
Edema / radiography*
Isometric Contraction / physiology*
Magnetic Resonance Imaging / methods*
Masseter Muscle / anatomy & histology,  radiography*
Reference Values

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