Functional Brain Imaging |
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Page 159
... pulse . The time interval between repeated 90 - degree pulses , TR , determines how much recovery time is available between each pulse . Fig . 4-34 . Gadolinium - based contrast agents accumulate. Saturation recovery sequence Mo 1 - exp ...
... pulse . The time interval between repeated 90 - degree pulses , TR , determines how much recovery time is available between each pulse . Fig . 4-34 . Gadolinium - based contrast agents accumulate. Saturation recovery sequence Mo 1 - exp ...
Page 160
... pulse before measuring the longitudinal magnetization with a 90 - degree pulse . tune T1 contrast . After a time , TR , the 180 - degree inversion , TI delay , and 90 - degree excitation sequence is repeated . For two different tissues ...
... pulse before measuring the longitudinal magnetization with a 90 - degree pulse . tune T1 contrast . After a time , TR , the 180 - degree inversion , TI delay , and 90 - degree excitation sequence is repeated . For two different tissues ...
Page 179
... pulse to pulse by adding a postcollection gradient pulse to rephase spins by an amount equal to the dephasing caused by the phase - encoding pulse . In these sequences , both the longitudinal and the transverse magnetization reach a ...
... pulse to pulse by adding a postcollection gradient pulse to rephase spins by an amount equal to the dephasing caused by the phase - encoding pulse . In these sequences , both the longitudinal and the transverse magnetization reach a ...
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