Abstract

This chapter reviews the characteristics of magnetic resonance images and some of the parameters that control them. It describes commonly used magnetic resonance imaging (MRI) pulse sequences and their clinical applications in veterinary imaging. An MRI 'pulse sequence' is a programed set of RF pulses and changing magnetic gradients, characterized by several parameters adjustable at the control workstation. Specific pulse sequences are designed for specific imaging goals and, for a given patient/clinical application, they are grouped in the form of an 'MRI protocol'. Inversion recovery pulse sequences use the same basic principles as the spin echo pulse sequences studied above to generate signal in the form of an echo. Together with spatial resolution, the signal-to-noise ratio (SNR) is the most important factor of image quality in MRI. A classic measurement of SNR in MRI is to measure the difference between signal in the object and the background noise and then divide it by the standard deviation of the background signal.

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