By Gary Liney
From 'AB platforms' to 'Zipper artefact' - even for the skilled practitioner in MRI, the plethora of technical phrases and acronyms could be daunting and bewildering. This concise yet accomplished consultant presents an efficient and useful creation to the total diversity of this terminology. it will likely be a useful resource of reference for all scholars, trainees and doctors operating with MRI. greater than 800 phrases more often than not encountered in MR Imaging and Spectroscopy are sincerely outlined, defined and cross-referenced. Illustrations are used to augment and clarify some of the definitions, and references to additional examining will element the reader to extra in-depth insurance. in addition to being a compendium of phrases from A to Z, the amount concludes with an invaluable number of appendices, which tabulate a few of the key constants, houses and equations of relevance.
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Extra resources for MRI from A to Z A Definitive Guide for Medical Professionals
Example text
The slice selection is in the y-direction and the in-plane directions run right-to-left and head-to-foot. May also be called frontal plane. See also sagittal, axial and oblique. See Figure 2. ■ Correlation coefficient Statistical parameter indicating how closely matched two sets of data are. Particularly useful in fMRI analysis to correlate pixel intensity changes with the stimulus reference pattern. Values range from −1 to 1, with the extreme values indicating a perfect correlation (the sign indicating the direction of the relationship) and zero indicates no correlation.
These effects can be catagorised into (i) static field (B0 ) effects, (ii) time-varying field effects (gradients) and (ii) radio-frequency (B1 ) effects. There are no known long-term or irreversible effects from exposure to fields below 10 tesla. 5 tesla. Rapidly varying magnetic fields produced by the imaging gradients may cause peripheral nerve stimulation. Excessive radio-frequency interaction in patients will lead to tissue heating (see SAR). See also static field limits. Reference F. G. Shellock (2001).
Diffusion See DWI. ■ Diffusion ellipsoid Three-dimensional representation of the diffusion tensor using an ellipsoid. The shape indicates the degree of anisotropy, the size gives the magnitude of diffusion and the orientation demonstrates the preferred diffusion direction. Typically, shapes may be spherical (isotropic in x,y,z), disc-shaped (isotropic in two planes) or cigar-shaped (preferred diffusion in one direction). ■ Diffusion tensor See DTI. ■ Diffusion time Related to the time between the bipolar gradient pulses used in a typical DWI sequence.