Apparatus, system and method of calibrating medical imaging systems
AssigneeCedara Software Corp.
InventorsMarwan Sati, Martin Cyr
Life of this patent
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Abstract
A C-arm imaging device method, apparatus and system are provided. The apparatus and system includes a module for determining the positions of an imaging source and an imaging receptor and a local gravity vector to determine an imaging source focal point displacement. The apparatus and system may include a module for determining magnetic field distortion. Data obtained by the apparatus and system can be stored for use in subsequent interpolation of imaging source focal point displacement for the C-arm imaging device.
Claims30
A method of calibrating a C-arm imaging device comprising the steps of:
- determining a position of an imaging source for each of a plurality of orientations of the C-arm, including determining a reference position of the imaging source for a reference orientation;
- determining a position of an imaging receptor for each of the plurality of orientations, including determining a reference position of the imaging receptor for the reference orientation;
- determining a local gravity vector for each of the plurality of orientations;
- determining an imaging source focal point displacement due to bending for each of the plurality of orientations using the reference position of the imaging source, the reference position of the imaging receptor, the position of the imaging source and the position of the imaging receptor in correspondence to the local gravity vector;
- and
- storing information on the position of the imaging source, the position of the imaging receptor, the gravity vector, and the imaging source focal point displacement for each of the plurality of orientations, for use in subsequent interpolation of imaging source focal point displacement based on a specific position of an imaging receptor and a specific local gravity vector.
An apparatus for calibrating a C-arm imaging device comprising:
- a position determining module including:
- a first position tracker attached to an imaging source for determining a position of the imaging source for each of a plurality of orientations of the C-arm, including determining a reference position of the imaging source for a reference orientation;
- a second position tracker attached to an imaging receptor for determining a position of the imaging receptor for each of the plurality of orientations, including determining a reference position of the imaging receptor for the reference orientation;
- a gravity sensor attached to a mobile part of the C-arm for determining a local gravity vector for each of the plurality of orientations;
- a processing module for determining an imaging source focal point displacement due to bending for each of the plurality of orientations using the reference position of the imaging source, the reference position of the imaging receptor, the position of the imaging source and the position of the imaging receptor in correspondence to the local gravity vector;
- and
- a database module for storing information on the position of the imaging source, the position of the imaging receptor, the gravity vector, and the imaging source focal point displacement for each of the plurality of orientations, for use in subsequent interpolation of imaging source focal point displacement based on a specific position of an imaging receptor and a specific local gravity vector.
Dependencies are inferred from the claim text.