Functional Brain Imaging |
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Page 151
... field 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 ...
... field 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 ...
Page 287
... Field dependence of oxygenation changes . Since BOLD contrast was first described at field strengths far above those ... strength.9,10 In tissue , signal changes resulting from an activation - induced oxygenation change are also expected to ...
... Field dependence of oxygenation changes . Since BOLD contrast was first described at field strengths far above those ... strength.9,10 In tissue , signal changes resulting from an activation - induced oxygenation change are also expected to ...
Page 288
... field 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 ...
... field 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 ...
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