Functional Brain Imaging |
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Page 151
... direction . The speed at which the axis rotates around the field direction , the precessional frequency or " Larmor " ( resonance ) frequency , wo , is directly pro- portional to the field strength , Bo ωρ = y Bo ( 4-1 ) where y is a ...
... direction . The speed at which the axis rotates around the field direction , the precessional frequency or " Larmor " ( resonance ) frequency , wo , is directly pro- portional to the field strength , Bo ωρ = y Bo ( 4-1 ) where y is a ...
Page 173
... direction ( X ) and phase encoding in the other direction ( Y ) . The constant " readout " gradient during data collection provides the frequency encoding while the set of repeated projections , each with a different phase encoding ...
... direction ( X ) and phase encoding in the other direction ( Y ) . The constant " readout " gradient during data collection provides the frequency encoding while the set of repeated projections , each with a different phase encoding ...
Page 258
... direction ( Fig . 7-27 ) . Full characteriza- tion of diffusion anisotropy requires measurement of the diffusion tensor , which is the ( scalar ) diffusion rate as a function of direction . The presence of nonrandom intracellular ...
... direction ( Fig . 7-27 ) . Full characteriza- tion of diffusion anisotropy requires measurement of the diffusion tensor , which is the ( scalar ) diffusion rate as a function of direction . The presence of nonrandom intracellular ...
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