| 摘要 |
The invention relates to a device and a method for correction of the position (x) of a field sensor ( 4 ) measured by means of a magnetic localization device. External field distortions, such as caused for example by the rotating components ( 1 a, 1 b) of a computer tomograph ( 1 ), are then determined with the help of reference sensor ( 3 ) placed at a known position. It is possible to deduce, for example, the current angle of rotation (Phi) of the computer tomograph ( 1 ) from the measurement signals of the reference sensor ( 3 ). Based on an empirically determined correction (delta(x, Phi)), the uncorrected determined positions (x) of the field sensor ( 4 ) can then be converted to corrected positions (x') in relation to the field distortions. The field generator ( 2 ) and the reference sensor ( 3 ) are preferably fastened to the gantry in order to eliminate the dependency of the field distortions on an inclination of the gantry.
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