Radiation penetration system and calibration of the same
AssigneeFraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
InventorsAndreas Jobst, Guenther Kostka, Peter Schmitt
Life of this patent
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Abstract
Position errors of the flat-panel detector in the axes system of the radiation penetration system relative to a necessitated position which remain, for example, after a coarse setup of the radiation penetration system are balanced and thus the accuracy of the radiation penetration system is brought almost randomly close to the accuracy which would have resulted if the flat-panel detector had been exactly adjusted mechanically subsequently by executing a geometrical correction of the radiation penetration raw image, so that a change of a projection of the penetrated object in the radiation penetration raw image due to the position error is reduced or corrected.
Claims24
A method for calibrating a radiation penetration system comprising a radiation source, a flat-panel detector for generating radiation penetration raw images of an object, a manipulator which is implemented to change a relative position between the radiation source, the object and the flat-panel detector, wherein the axes system is defined by at least one movement axis of the manipulator and one beam axis between the radiation source and the flat-panel detector, and a preprocessor for applying correction data to the radiation penetration raw images of the object to acquire radiation penetration images of the object, comprising
- generating radiation penetration raw images of a calibration object in different relative positions changed with respect to each other by the manipulator between the radiation source, the calibration object and the flat-panel detector on the basis of radiation which penetrates the calibration object between the radiation source and the flat-panel detector, by the flat-panel detector;
- and
- readjusting the correction data depending on the radiation penetration raw images of the calibration object so that the application of the readjusted correction data leads to a geometrical correction of the radiation penetration raw images, so that a change of a projection of the object in the radiation penetration raw image due to a position error of the flat-panel detector in the axes system relative to a necessitated position is reduced, wherein the position error of the flat-panel detector is defined as
- a tilting of a column or line direction of the flat-panel detector relative to a rotation or translation positioning axis of the manipulator, or
- a tilting of the column or line direction of the flat-panel detector relative to a trajectory along which the flat-panel detector moves relative to the object between the plurality of radiation penetration raw images,
- wherein the preprocessor is implemented such that the same applies the correction data to the radiation penetration raw images of the object so that radiation penetration images of the object acquired therefrom comprise a lower resolution than the radiation penetration raw images of the object and that the readjustment of the correction data is executed depending on the radiation penetration raw images of the calibration object such that the geometrical correction takes place in a resolution which is higher than the resolution of the radiation penetration images of the object.
A radiation penetration system comprising:
- a device for calibrating the radiation penetration system,
- a radiation source,
- a flat-panel detector for generating radiation penetration raw images of an object,
- a manipulator which is implemented to change a relative position between the radiation source, the object and the flat-panel detector, wherein the axes system is defined by at least one movement axis of the manipulator and a beam axis between the radiation source and the flat-panel detector, and
- a preprocessor for applying correction data to the radiation penetration raw images of the object to acquire radiation penetration images of the object,
- the device for calibrating the radiation penetration system comprising
- a generator for generating radiation penetration raw images of a calibration object in different relative positions changed with respect to each other by the manipulator between the radiation source, the calibration object and the flat-panel detector on the basis of radiation which penetrates the calibration object between the radiation source and the flat-panel detector, by the flat-panel detector;
- and
- a readjuster for readjusting the correction data depending on the radiation penetration raw images of the calibration object so that the application of the readjusted correction data leads to a geometrical correction of the radiation penetration raw images, so that a change of a projection of the object in the radiation penetration raw image due to a position error of the flat-panel detector in the axes system relative to a necessitated position is reduced, wherein the position error of the flat-panel detector is defined as
- a tilting of a column or line direction of the flat-panel detector relative to a rotation or translation positioning axis of the manipulator, or
- a tilting of the column or line direction of the flat-panel detector relative to a trajectory along which the flat-panel detector moves relative to the object between the plurality of radiation penetration raw images,
- wherein the preprocessor is implemented such that the same applies the correction data to the radiation penetration raw images of the object such that the radiation penetration images of the object acquired therefrom comprise a lower resolution than the radiation penetration raw images of the object, and the readjuster for readjusting is implemented to execute the readjustment of the correction data depending on the radiation penetration raw images of the calibration object, so that the application of the readjusted correction data leads to a geometrical correction of the radiation penetration raw images of the object, so that the geometrical correction takes place in a resolution which is higher than the resolution of the radiation penetration images of the object.
Dependencies are inferred from the claim text.