Functional Brain Imaging |
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Page 274
... changes and contrast agent concentra- tion . However , empirical data support the results from the medium exchange ... Changes in cerebral blood volume may be due to changes in the size of the vessels ( distention ) or to changes in the ...
... changes and contrast agent concentra- tion . However , empirical data support the results from the medium exchange ... Changes in cerebral blood volume may be due to changes in the size of the vessels ( distention ) or to changes in the ...
Page 288
... changes caused by visual stimulation for a volunteer studied at both 1.5 T and 4.0 T. ( From Turner R et al : Magn Reson Med 29 : 277 , 1993. ) Photic Stimulation GE Images Fig . 7-66 . EPI data. percentage change 20 15 10 -5 0 50 100 ...
... changes caused by visual stimulation for a volunteer studied at both 1.5 T and 4.0 T. ( From Turner R et al : Magn Reson Med 29 : 277 , 1993. ) Photic Stimulation GE Images Fig . 7-66 . EPI data. percentage change 20 15 10 -5 0 50 100 ...
Page 294
... changes arising from larger veins . The simulation results indicate that if the ratio of the changes in SE to GRE images is small ( e.g. , less than 0.2 ) , then the measured image intensity changes are probably arising from vessels ...
... changes arising from larger veins . The simulation results indicate that if the ratio of the changes in SE to GRE images is small ( e.g. , less than 0.2 ) , then the measured image intensity changes are probably arising from vessels ...
Contents
Introduction to Brain Imaging | 1 |
Computerized Axial Tomography | 97 |
Magnetic Resonance Imaging | 145 |
Copyright | |
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Functional Brain Imaging William W. Orrison,Jeffrey Lewine,John Sanders,Michael F. Hartshorne Limited preview - 2017 |
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abnormal activity ALFMA arterial auditory Axial axon basal ganglia brain capillary cells central central sulcus cerebral blood flow chemical shift clinical coil computed computed tomography contrast agent cortex cortical decreased demonstrating detection diffusion dipole disease effects encoding epilepsy extracellular field strength FMRI focal frequency functional Gd-DTPA glucose gradient HMPAO infarction inhomogeneous injection lesions Magn Reson magnetic field magnetic resonance imaging mapping measured membrane metabolism methods motor msec neoplasms nerve nervous system neural neuromagnetic neurons normal Nucl nuclei oxygen paramagnetic patients pattern peak perfusion phase positron emission tomography posterior processing projections proton pulse Radon transform rCBF receptors relaxation scan seizures sensitivity sequences signal changes signal intensity slice SMRM Annual Meeting somatosensory spatial SPECT spectra spikes spin echo stimulation studies T2-weighted techniques temporal lobe thalamus tion tissue tumors uptake visual voxel white matter