Published November 6, 2020 | Version 1.0
Dataset Open


  • 1. INRIM
  • 2. Philips Research Laboratories
  • 3. NPL


Magnetic resonance-based electric properties tomography

The example shows the uncertainty evaluation, under repeatability conditions, of a technique for Electric Properties Tomography (EPT), a quantitative imaging method based on Magnetic Resonance Imaging (MRI). Repeated acquisitions of MRI scans of a homogeneous cylindrical phantom are analysed with appropriate statistical techniques to evaluate the variance-covariance matrix of the EPT input. The latter is then propagated through the EPT technique according to the law of propagation of the uncertainty as described in the GUM [Activity A2.3.2].

Files contained in the dataset are:

  • ReadMe: text file describing the EMUE-D5-3-EPTTissueCharacterization dataset
  • A232_Report.pdf: Report “Magnetic resonance-based electric properties tomography”
  • A232_Report.tex: LaTeX file to be compiled in order to produce A232_Report.pdf
  • CompendiumA232.bib: bibliography file
  • kernel-shapes.png: plot in figure 1 of A232_Report.pdf
  • acquired-maps.png: plot in figure 2 of A232_Report.pdf
  • input-cov-pixel.png: plot in figure 3 of A232_Report.pdf
  • output-cov.png: plot in figure 4 of A232_Report.pdf
  • output-distr.png: plot in figure 5 of A232_Report.pdf
  • code: directory containing the computational codes for the EPT software (C++) and post-processing (matlab)
  • code/averages.m: matlab code that computes the averages, the weighted averages and the corresponding uncertainties
  • code/CMakeLists.txt: cmake project for building the EPT software
  • code/ C++ source file of the EPT software
  • code/main.h: C++ header file of the EPT software
  • data: directory containing the input and the output data of the EPT software
  • data/emue-[0-2]-[1-5].toml: input configuration files for the EPT software
  • data/emue-sphere.h5: input dataset of scans for the EPT software
  • data/emue-sphere-scov.h5: input dataset of variance-covariance matrix computed with shrinkage estimation for the EPT software
  • data/emue-[0-2]-[1-5].log: output log files of the EPT software
  • data/emue-[0-2]-[1-5]-output.h5: output dataset files of the EPT software


The example relies on the implementation of phase-based Helmholtz EPT collected in the open-source C++ library EPTlib 0.1.1 (, developed in the framework of the EMPIR Project 18HLT05 QUIERO (


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