Método mejorado para la RMN funcional espinal. (Inglés)

"Método mejorado para la RMN funcional espinal con alcance grande del volumen de la médula espinal."

Abstract

Purpose To develop a spinal functional MRI (fMRI) method with three-dimensional coverage of a large extent of the spinal cord with minimal partial volume effects

Materials and Methods fMRI data of the cervical spinal cord were obtained at 1.5 T with a single-shot fast spin-echo imaging method, from thin contiguous sagittal slices spanning the cord. Thermal stimulation was applied to the palm of the hand in a block pattern with 15°C for stimulation and 32°C during baseline periods. Prior to analysis, the image data at each time point were reformatted into three-dimensional volumes and resliced perfectly transverse to the spinal cord. Smoothing was applied only in the superior-inferior (S/I) direction across uniform tissue types. Active voxels were then identified by means of a correlation to a model paradigm.

Results The resulting activity maps demonstrate activity primarily in ipsilateral sensory areas and in some motor areas, consistent with the spinal cord neuroanatomy. These data also demonstrate detail of the subsegmental organization of the spinal cord, as well as anatomical detail of the spinous processes and positions of nerve roots.

Conclusion The spinal fMRI method described enables large volume coverage of the spinal cord in three dimensions, with reliable and reproducible results.

J. Magn. Reson. Imaging 2005;21:520-526. © 2005 Wiley-Liss, Inc.