T_2 Mapping of Muscle Activity using Ultrafast Imaging

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概要

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• Measuring exercise-induced muscle activity is essential in sports medicine. Previous studies proposed measuring transverse relaxation time (T2) using muscle functional magnetic resonance imaging (mfMRI) to map muscle activity. However, mfMRI uses a spin-echo (SE) sequence that requires several minutes for acquisition. We evaluated the feasibility of T2 mapping of muscle activity using ultrafast imaging, called fast-acquired mfMRI (fast-mfMRI), to reduce image acquisition time. The current method uses 2 pulse sequences, spin-echo echo-planar imaging (SE-EPI) and true fast imaging with steady precession (TrueFISP). SE-EPI images are used to calculate T2, and TrueFISP images are used to obtain morphological information. The functional image is produced by subtracting the image of muscle activity obtained using T2 at rest from that produced after exercise. Final fast-mfMRI images are produced by fusing the functional images with the morphologic images. Ten subjects repeated ankle plantar flexion 200 times. In the fused images, the areas of activated muscle in the fast-mfMRI and SE-EPI images were identical. The geometric location of the fast-mfMRI did not differ between the morphologic and functional images. Morphological and functional information from fast-mfMRI can be applied to the human trunk, which requires limited scan duration. The difference obtained by subtracting T2 at rest from T2 after exercise can be used as a functional image of muscle activity.

• 2011-06-01

著者

• Niitsu Mamoru

  Tokyo Metropolitan University

• Itoh Akiyoshi

  Graduate Course Of Computer Sciences College Of Sciences And Technology Nihon University

• Kuruma Hironobu

  Divisions Of Radiological Sciences Faculty Of Health Sciences

• Nitta Osamu

  Divisions Of Physical Therapy Faculty Of Health Sciences

• Tawara Noriyuki

  Department Of Sports Medicine Japan Institute Of Sports Sciences

• Nitta Osamu

  Division Of Physical Therapy Faculty Of Health Sciences Tokyo Metropolitan University

• Niitsu Mamoru

  Division Of Radiological Sciences Faculty Of Health Sciences Tokyo Metropolitan University

• Kuruma Hironobu

  Division Of Physical Therapy Faculty Of Health Sciences Tokyo Metropolitan University

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• 45. Measurements of the trunk muscles on MRI in trained and untrained men(The Proceedings of the 15th Annual Meetings of Japan Society of Exercise and Sports Physiology July 26-27, (Hirosaki))
• Appropriate Slice Location to Assess Maximal Cross-sectional Area of Individual Rotator Cuff Muscles in Normal Adults and Athletes
• Functional T_2 Mapping of the Trunkal Muscle
• Effects of MR Image Noise on Estimation of Short T_2 Values from T_2-weighted Image Series
• T_2 Mapping of Muscle Activity using Ultrafast Imaging

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