By Scott W. Atlas
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Extra resources for Magnetic Resonance Imaging of the Brain and Spine (2 Volume Set)
The linear spatial resolution for MRI is proportional to the cube root of the SNR, and thus the resolution of MRI using isotropic voxels varies more slowly than the SNR with increasing field strength. 5-T scanners, one is struck by the remarkable increase in anatomic detail that is visible. Although the increase in available SNR noted earlier plays a role, several other factors are also involved. Tissues generally differ slightly in chemical shift and diamagnetic susceptibility as well as in T1 and T2 relaxation times.
As long as precautions are taken to avoid the presence of ferromagnetic foreign bodies, excessive rate of change of gradient fields, excessive levels of acoustic noise, and excessive deposition of RF energy, MRI is inherently a very safe imaging modality. For example, it should always be remembered that, during the RF transmitter pulse, large instantaneous RF voltages are present on the transmitter coil and cables. Care should be taken to avoid coupling between these coils and cables and other conductors such as electrocardiogram leads and surface coil cables in the proximity of the patient.
The temporal positional accuracy and repeatability (TPAR) of the digital signals is an important system consideration. 1â to 1-Âµs update interval with 10-ns TPAR In addition to the RF, gradient, and digital signals, additional outputs may be used to drive resistive magnet shims to correct homogeneity or to provide scan-specific corrections. Over the past decade and a half the development of MR physics has generated elaborate and interdependent waveforms for gradient coils, RF coils, and shim coils.
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