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KMID : 0858520080120010033
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Journal of the Korean Society of Magnetic Resonance in Medicine
2008 Volume.12 No. 1 p.33 ~ p.39
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Real-Time fMRI-Guided Functional MR Spectroscopy: The Lactate Peaks at the Motor Cortex during Hand-Grasping Tasks
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Choi Sun-Seob
Oh Jong-Young
Kang Myung-Jin
Lee Jin-Hwa
Yoon Seong-Kuk
Nam Kyeong-Jin
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Abstract
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Purpose: There is debate concerning the observation of metabolite changes on MRS at the designated cortex during some tasks. The purpose of this study is to assess the change of the lactate content at the motor cortex during hand-grasping tasks with performing real-time fMRI-guided fMRS.
Material and Methods :Seven healthy volunteers (23-28 years old) underwent realtime fMRI during right hand grasping tasks with using a 1.5 T system. After confirming the activating area, single voxel MRS was preformed at 1) the baseline, 2) during the task and 3) after the task on the activating cortex. The three consecutive spectra were compared for observing the changes of the lactate content by the tasks. The Cho/Cr, NAA/Cr and Lac/Cr ratios were calculated manually from those spectra.
Results:MRS during the tasks revealed the lactate peaks at the 1.33 ppm resonance frequency with great conspicuity at the activated area, which was identified on the real-time fMRI. After the task scan, the lactate peaks completely disappeared and the spectra recovered to the values of the baseline scan in all volunteers. At baseline, during the task and after the task, the Cho/Cr ratios were 0.81, 0.76 and 0.77, respectively, and the NAA/Cr ratios were 1.68, 1.65 and 1.72, respectively, and the Lac/Cr ratios were 0.28, 0.41 and 0.30, respectively. During the task, Lac was significantly increased by 46%.
Conclusion: We observed prominent lactate peaks on MRS during hand-grasping tasks at the activated area, as was shown on the real-time fMRI. We suggest that fMRS can be used as a sensitive tool for observing the metabolite changes of the functioning brain.
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KEYWORD
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Proton MR spectroscopy, Real time imaging, Functional magnetic resonance imaging, Metabolism, Motor cortex
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