Functional Brain Imaging |
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Page 151
... strength of their signals is weak . Most of the body is made up of proton - rich water or fat , so proton NMR provides enough signal strength to obtain useful imaging resolutions . The y for 1H is 4257.43 Hz / G ( 1 Hz = 1 cycle / sec ) ...
... strength of their signals is weak . Most of the body is made up of proton - rich water or fat , so proton NMR provides enough signal strength to obtain useful imaging resolutions . The y for 1H is 4257.43 Hz / G ( 1 Hz = 1 cycle / sec ) ...
Page 287
... strength , also consistent with susceptibility dependence being the dominant signal change mechanism . SNR considerations . FMRI at higher field strengths can benefit from two important mechanisms . We have seen that the susceptibility ...
... strength , also consistent with susceptibility dependence being the dominant signal change mechanism . SNR considerations . FMRI at higher field strengths can benefit from two important mechanisms . We have seen that the susceptibility ...
Page 288
... strengths because tissue relaxation rates also increase with field strength . In addition , susceptibility artifacts increase with field strength . This primarily affects the available choice of TE at the different field strength . In ...
... strengths because tissue relaxation rates also increase with field strength . In addition , susceptibility artifacts increase with field strength . This primarily affects the available choice of TE at the different field strength . In ...
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