FIELD: medicine.
SUBSTANCE: group of inventions refers to medicine. According to magnetic particle visualisation technique, a recovery process requires the alleged system function details. This function describes a relation between a spatial position and a frequency characteristic. For rational definitions and given scan region, the system function becomes extremely great leading to great collection time for the system function and to a need for a great amount of memory in the process of recovery. The present group of inventions enables reducing the size of the system function matrix with using the structural properties of the matrix. These properties are e.g. spatial symmetries reducing a column dimension, and identical characteristics at various frequencies reducing a row dimension. According to the other versions, the matrix can be transformed into a dispersed presentation with using the respective basic function.
EFFECT: present group of inventions enables reducing the size of the system function matrix with using structural properties of the matrix.
11 cl, 19 dwg
