Functional Brain Imaging |
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Page 165
... gradient can be pro- duced in any arbitrary direction by simultaneously using combinations of all three gradient coils . Another consideration is the gradient " rise time " or how much time is required to turn on and establish a steady ...
... gradient can be pro- duced in any arbitrary direction by simultaneously using combinations of all three gradient coils . Another consideration is the gradient " rise time " or how much time is required to turn on and establish a steady ...
Page 173
... gradient Readout gradient Slice selection gradient Amplitude different for each pulse Gradient recalled echo Fig . 4-50 . Spatial encoding of a two - dimensional slice typically employs frequency encoding in one direction ( X ) and ...
... gradient Readout gradient Slice selection gradient Amplitude different for each pulse Gradient recalled echo Fig . 4-50 . Spatial encoding of a two - dimensional slice typically employs frequency encoding in one direction ( X ) and ...
Page 178
... gradient selects the Fourier line being acquired . The corresponding paths in Fourier space are shown in Fig . 4-60 for the cases of both gradients being applied together or separately . The effect of each gradient and the 180 - degree ...
... gradient selects the Fourier line being acquired . The corresponding paths in Fourier space are shown in Fig . 4-60 for the cases of both gradients being applied together or separately . The effect of each gradient and the 180 - degree ...
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