Exploiting the symmetry of the magnetic particle imaging system matrix

In this work, the first study on the symmetry of the 2D magnetic particle imaging (MPI) system matrix is performed. The matrix symmetries are formed by the symmetries of the drive-field sequence and the characteristic of the Fourier transformation. The symmetries can be exploited for reducing the number of calibration scans that are necessary to acquire the system matrix, which is a time demanding task in MPI. Experiments show that by using vertical and horizontal mirroring of the system matrix, the calibration scan can be accelerated by a factor of four without loss of image quality.