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Imaging Modality Physics Simulator

Apply modality-specific noise and blur models — Gaussian/beam-hardening CT, Rician/bias-field MRI, Poisson/blur PET, and speckle ultrasound — to a shared phantom.

  • image physics
  • noise models
  • SNR
  • CNR
  • modality
SNR (whole image)
3.090
CNR (range / noise)
4.462

Simulated image

CT

Noise map (|Δ| from clean)

Intensity histogram

00.20.40.60.811.21.4020406080100120140160180200220Normalized intensityCount
Noise texture is not interchangeable across modalities
CT noise is signal-independent and roughly Gaussian after reconstruction; MRI magnitude noise is Rician and brighter in high-signal regions; PET noise is Poisson-limited by dose and blurred by detector physics; ultrasound speckle is multiplicative. A denoising or harmonization method tuned for one of these will not transfer to the others without re-derivation.