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SNR

SNR. Definition Averaging uncorrelated noise Thermal vs. physiological. Averaging to beat down noise. If noise is uncorrelated:. Signal-to-Noise Ratio (SNR). Thermal noise (  th ) is uncorrelated and normally and uniformly distributed Imaging noise

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SNR

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  1. SNR • Definition • Averaging uncorrelated noise • Thermal vs. physiological SNR

  2. Averaging to beat down noise If noise is uncorrelated: SNR

  3. Signal-to-Noise Ratio (SNR) • Thermal noise (th) is uncorrelated and normally and uniformly distributed • Imaging noise • Physiological noise (phys) has all sorts of correlations and is different in gray matter, white matter … • Brain noise SNR

  4. Caveat: estimating zero-mean noise in magnitude images Gaussian distribution Rician distribution SNR

  5. Small voxel: low SNR SNR

  6. Big voxel: dominated by phys. noise Phys. noise masked by thermal noise SNR lower in gray matter SNR

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