Functional Brain Imaging |
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Page 103
... object represents a line integral through the object . The overall objective is to determine the original object spatial density distribution from a " sufficient " set of projections , that is , to find the corresponding inverse Radon ...
... object represents a line integral through the object . The overall objective is to determine the original object spatial density distribution from a " sufficient " set of projections , that is , to find the corresponding inverse Radon ...
Page 165
... object , so does the Larmor frequency . Applying a linear field gradient , therefore , has the effect of causing each strip of the object to give a signal at a slightly different frequency ( Fig . 4-36 ) . Thus the presence of the ...
... object , so does the Larmor frequency . Applying a linear field gradient , therefore , has the effect of causing each strip of the object to give a signal at a slightly different frequency ( Fig . 4-36 ) . Thus the presence of the ...
Page 168
... object to the excitation pulse . Typically , one or several slices of interest through the object are selected for exci- tation . The use of a linear field gradient across an object results in the Larmor , or resonance , frequency also ...
... object to the excitation pulse . Typically , one or several slices of interest through the object are selected for exci- tation . The use of a linear field gradient across an object results in the Larmor , or resonance , frequency also ...
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 |
Common terms and phrases
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