  Magnetic particle imaging (MPI) is a tomographic method to determine the
spatio-temporal distribution of magnetic nanoparticles. In this document, a
file format for the standardized storage of MPI and magnetic particle
spectroscopy (MPS) data is introduced. The aim of the Magnetic Particle Imaging
Data Format (MDF) is to provide a coherent way of exchanging MPI and MPS data
acquired with different devices worldwide. The focus of the MDF is on sequence
parameters, measurement data, calibration data, and reconstruction data. The
format is based on the hierarchical document format in version 5 (HDF5). This
document discusses the MDF version 2.1.0, which is not backward compatible with
version 1.x.y.
