Functional Brain Imaging |
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Page 154
... transverse component of the rotating magnetic fields . Since this transverse magnetization rotates so fast ( 63.9 MHz is 63,900,000 cycles per second , in a 1.5 T field ) , the first thing that is generally done with the signal is to ...
... transverse component of the rotating magnetic fields . Since this transverse magnetization rotates so fast ( 63.9 MHz is 63,900,000 cycles per second , in a 1.5 T field ) , the first thing that is generally done with the signal is to ...
Page 156
... Transverse magnetization 37 % Spin - spin relaxation T2 - + / T2 13.5 % Mo exp 0 T2 2T2 Time M ZA Net magnetization M Not excited Spin - spin exchange M X Fig . 4-17 . Spin - spin relaxation describes the exponential loss of transverse ...
... Transverse magnetization 37 % Spin - spin relaxation T2 - + / T2 13.5 % Mo exp 0 T2 2T2 Time M ZA Net magnetization M Not excited Spin - spin exchange M X Fig . 4-17 . Spin - spin relaxation describes the exponential loss of transverse ...
Page 179
... transverse magnetization , and only the longitudinal magnetization reaches a steady state from the continuing series of excitation pulses . The T1 and T2 contrast mechanisms for FLASH sequences are similar to those of spin echo ...
... transverse magnetization , and only the longitudinal magnetization reaches a steady state from the continuing series of excitation pulses . The T1 and T2 contrast mechanisms for FLASH sequences are similar to those of spin echo ...
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