FIELD: physics.
SUBSTANCE: device comprises: a selection means comprising a generator unit (110) of the selection field signals and elements (116) of the selection field to create a magnetic selection field (50) having such a spatial structure of its magnetic field strength, that the first sub-zone (52) having a low magnetic field strength, where the magnetization of the magnetic particles does not reach saturation, and the second sub-zone (54) having a higher magnetic field strength, where the magnetization of the magnetic particles comes to saturation, the exciting means (120) comprising a signal generator unit (122) of the exciting field and the coils (124, 125, 126, 127) of the exciting field for changing the position in space of the two sub-zones (52, 54) are formed in the view field (28) by exciting the magnetic field so that the magnetization of the magnetic material changes locally, a receiving means containing a signal receiving unit (140) and a receiving coil (148) for receiving the detection signals. The detection signals depend on the magnetization in the view field (28), and the magnetization is affected by the position of the first and the second sub-zones (52, 54) in space, and the reconstructing means (152) for the image reconstruction of the view field (28) from the detection signals. The spectrum of the said detection signals includes a plurality of the frequency components. One or more of these frequency components are selected and/or weighted by using the quality factor of the specific frequency component signal obtained from the measurement results of the background signals, wherein only the selected and/or weighted frequency components are used for the image reconstruction.
EFFECT: increasing the resolution.
13 cl 18 dwg
