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Biomedical Signal and Image Processing
FIGURE 15.15 Spectroscopic neurovascular MRI scan under 3T magnetic field strength
imaging conditions. (Courtesy of Philips Medical Systems.)
cortex will not only help identify hearing impaired–related problems but also aid in
the diagnosis of certain types of dyslexia.
In dyslexia studies, the regions of the cortex under investigation are focused on
the frontal and temporal cortex. The temporal cortex is more involved in the data
processing part of the auditory input, and this is where the f MRI changes will show
significant differences when compared to the f MRI scans of control subjects.
15.6.2 fMRI FOR MONITORING MOTONEURON ACTIVITIES OF BRAIN
As in other cortical monitoring, f MRI is the most appropriate way to obtain any
significant information on the motor cortex activity of the brain.
The motor neuron activity can be determined by means of evoked potential
recordings resulting from specific motor tasks. These tasks are designed based on
the clinical concerns about the patient. Assignments would involve, for instance,
hand, foot, finger, or two motions in a predetermined grid pattern with one or two