The signal-to-noise ratio (SNR) is a fundamental measure of quality and performance in MRI, most frequently used as a metric for comparing and optimizing imaging sequences, MR hardware (e.g., RF coils), or to assess and process new imaging and reconstruction techniques. Clinically, signal and noise considerations are important for image assessment such as in reliable lesion characterization, or in the context of accurate parameter fitting (relaxometry). This presentation will review the basic principles relevant to SNR, sources of noise, basic noise statistics, multi-channel noise, measurement of SNR and contrast-to-noise ratio, and factors influencing SNR.
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