Patent ID: 9651637
Date: 2017-05-16
CPC Classifications: A61B,G01R,G06T

Claim:
1. A method of determining a spatial assignment and/or spatial distribution of magnetic particles in a specified analysis volume performed by a Magnetic Particle Imaging (MPI) measuring device, comprising: in an acquisition step performed with a receiving device of the MPI measuring device, acquiring m MPI time signals with a total of m·N measured values A in a signal processing step: a) selecting one image acquisition period from the scanning period and, for the selected image acquisition period, generating a composite time signal z with signal values z b) determining a corrected time signal {tilde over (z)} from the composite time signal z, wherein the determining the corrected time signal {tilde over (z)} comprises windowing the composite time signal z to produce a windowed composite time signal, computing a Fourier transform of the windowed composite time signal to produce a windowed, Fourier-transformed, composite time signal having a number of frequency values, and reducing the number of frequency values by eliminating intermediate frequencies among the number of frequency values to produce a reduced frequency spectrum; in a reconstruction step, computing the spatial assignment and/or the spatial distribution of the magnetic particles from either the reduced frequency spectrum or the corrected time signal {tilde over (z)}; and in an outputting step, providing results of the reconstruction and/or at least one parameter derived from the reconstruction.