Analysis of brain activity during clenching by fMRI

Journal of Oral Rehabilitation - Tập 29 Số 5 - Trang 467-472 - 2002
T. Tamura1, Takeo Kanayama1, Shigemitsu Yoshida1, Takao Ḱawasaki1
1Department of Oral Functional Science, Graduate School of Dental Medicine, Hokkaido University, Kita‐ku, Sapporo, Japan

Tóm tắt

It has been considered difficult to obtain satisfactory functional magnetic resonance images (fMRI) during jaw movements because the head motion during jaw movements makes artefacts on the images. To avoid these artefacts, we chose clenching task and larger pixels to allow some head motion of the subjects. Further the study discarded all data from subjects whom the head was evaluated to move more than 0·3 mm. The study examined 10 healthy right‐handed volunteers with echo‐planar magnetic resonance (MR) imaging and functional MR signal intensity changes could be obtained in all subjects. However, in the analysis of each pixel of individuals, three different types of pixels were established. It was determined that the pixels that synchronized positively with the task on/off and where signal intensity increase was below 10% expressed the real brain activity. Pixels showing the real brain activity were found in the sensory, motor and pre‐motor cortexes in both hemispheres in all subjects, and also in the insula region of two subjects. No pixels were found in the striatum and supplementary motor areas. From the above careful consideration and individual analysis of each pixel, it was concluded that brain activity during the clenching task could be obtained by fMRI.

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Tài liệu tham khảo

AINE C.J., 1995, A conceptual overview and critique of functional neuroimaging techniques in humans: I. MRI/fMRI and PET, Critical Reviews in Neurobiology, 9, 229

10.1002/mrm.1910250220

BUCKNER R.L. BANDETTINI P.A. O'CRAVEN K.M. SAVOY R.L. PETERSEN S.E. RAICHLE M.E.&ROSEN B.R.(1996)Detection of cortical activation during averaged single trials of a cognitive task using functional magnetic resonance imaging (see comments).Proceedings of the National Academy of Sciences of the United States of America 93 14 87814 878.

10.1038/386608a0

10.1152/jn.1999.81.4.1917

10.1152/ajpgi.1999.277.1.G219

10.1016/0006-8993(93)90006-9

10.1126/science.8342027

KWONG K.K. BELLIVEAU J.W. CHESLER D.A. GOLDBERG I.E. WEISSKOFF R.M. PONCELET B.P. KENNEDY D.N. HOPPEL B.E. COHEN M.S.&TURNER R.(1992)Dynamic magnetic resonance imaging of human brain activity during primary sensory stimulation.Proceedings of the National Academy of Sciences of the United States of America 89 56755675.

10.1016/s0003-9969(96)00081-7

10.1152/jn.1999.82.1.463

10.1002/mrm.1910330521

SINGH L.N., 1998, Functional MR imaging of cortical activation of the cerebral hemispheres during motor tasks, American Journal of Neuroradiology, 19, 275

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Journal of Oral Rehabilitation

Tập 29 Số 5

467-472

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