Functional Brain Imaging |
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Page 255
... Diffusion in Magnetic Field Gradients 66 Diffusion of excited spins in an inhomogeneous magnetic field leads to reduced NMR echo signal intensity . This effect was first noted by Hahn early in the development of NMR . The random ...
... Diffusion in Magnetic Field Gradients 66 Diffusion of excited spins in an inhomogeneous magnetic field leads to reduced NMR echo signal intensity . This effect was first noted by Hahn early in the development of NMR . The random ...
Page 256
... diffusion ) 2.97 In vivo 2.94 CSF δ 8 A Fig . 7-23 . Stejskal - Tanner pulsed gradient diffusion mea- surement sequence . 90 ° 180 ° Echo Radiofrequency Slice - select Readout G G Phase - encode Fig . 7-24 . Diffusion imaging sequence ...
... diffusion ) 2.97 In vivo 2.94 CSF δ 8 A Fig . 7-23 . Stejskal - Tanner pulsed gradient diffusion mea- surement sequence . 90 ° 180 ° Echo Radiofrequency Slice - select Readout G G Phase - encode Fig . 7-24 . Diffusion imaging sequence ...
Page 257
... diffusion coefficient . In a spin echo sequence , the loss of signal from intrinsic T2 processes limits the amount of potential sequence diffusion time . An alternative approach is to vary the diffusion sensitizing gradient while ...
... diffusion coefficient . In a spin echo sequence , the loss of signal from intrinsic T2 processes limits the amount of potential sequence diffusion time . An alternative approach is to vary the diffusion sensitizing gradient while ...
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