DOIAbstract
Signal and Noise (Azim Celik and Weili Lin, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina). This unit discusses the basic signal detection technique in magnetic resonance imaging based on quadrature (i.e., measured in two orthogonal channels) technique. The detected signal is demodulated with respect to the Larmor frequency and digitized. The measured MR signal also includes noise. The noise in MR generally derives from the random fluctuations in the receive coil electronics and from the sample. Even though there are other sources of signal fluctuations such as digitization noise and pseudo‐random ghosting due to moving spins, these sources are minimized in an ideal experiment. The effect of these noises in MR...
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