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AAPM Task Group on Measurements of the 3D Image Noise-Power Spectrum in Computed Tomography

This Task Group is charged with developing standard methods for measuring the 3D image noise-power spectrum (NPS) of x-ray computed tomography (CT), emphasizing practical experimental methodology that is:

  1. applicable to a broad range of:
    • CT scanner technologies (e.g., various implementations and combinations of single-slice axial CT, multi-detector CT (MDCT), helical CT, and cone-beam CT).
    • detector technologies (e.g., single-row detectors, MDCT arrays, and flat-panel detectors)
    • physical embodiments (e.g., slip-ring gantries, C-arm gantries, and experimental benchtops)
    • applications (e.g., boday CT, breast CT, and CT angiography);
  2. mindful of general, theoretical considerations regarding the multi-dimensional image NPS as described by the parent Working Group, including:
    • dimensionality and normalization of the resulting 3D NPS
    • factors affecting correlation in the 3D volumetric image data
    • factors affecting correlation in the 3D volumetric image data
    • factors affecting stationarity of the noise and the applicability of NPS analysis
    • extension to analysis of the 3D noise-equivalent quanta (NEQ).

A Task Group Report will be produced to communicate practical standards for CT NPS measurement. Sample code for implementing methods is highly recommended.