X-ray calibration dummy, a method for non-marker-based registration for use in navigation-guided operations employing said x-ray calibration dummy, and a medical system having such an x-ray calibration dummy
AssigneeSiemens Aktiengesellschaft
InventorMatthias Mitschke
Life of this patent
Estimating the term…
Abstract
An X-ray calibration dummy (RP) having markings (4) that may be acquired by a position-acquisition system (30). The invention also concerns a method for nonmarker-based registration for use in navigation-guided operations employing the X-ray calibration dummy (RP). A medical system for carrying out the method has a C-shaped X-ray machine (10), a position-acquisition system, 30, and the X-ray calibration dummy (RP).
Claims16
An X-ray calibration dummy comprising:
- first markings (3) that will appear on X-ray images for use in determining projection geometries of an X-ray system that may be rotated about an axis (A) used for reconstructing a volumnar record;
- and
- second markings (4) differing from the first markings (3) and that may be acquired by a position-acquisition system (30) for non-marker-based registration for use in navigation guided operations on an object (P),
- the second markings (4) being arranged within a first zone (1) of the X-ray calibration dummy (RP) and the first markings (3) being arranged within a second zone (2) of said X-ray calibration dummy that differs from the first zone (1),
- wherein said X-ray calibration dummy (RP) has a cylindrical shape, the first zone (1) being one of the ends of the cylindrically shaped X-ray calibration dummy (RP) and the second zone (2) being a lateral surface of the cylindrically shaped X-ray calibration dummy.
A method for non-marker-based registration for use in navigation-guided operations employing a position-acquisition system (30), an X-ray machine (10) and an X-ray calibration dummy (RP), the X-ray machine (10) and the X-ray calibration dummy (RP) being provided with markings (4, 33) that may be acquired by the position-acquisition system (30), having the following method steps:
- a) orienting the X-ray machine (10) and the X-ray calibration dummy (RP) relative to one another such that a coordinate system (OP) assigned to the X-ray calibration dummy (RP) at least largely coincides with coordinate system (OW) of a volume to be reconstructed of a first object (P) to be X-rayed by the X-ray machine (10) in a subsequent measurement on the object (P) or such that the positions of both of the coordinate systems, (OP and OW) relative to one another are either known or may be determined in a simple manner,
- b) determining the position and orientation of the coordinate system (OP) of the X-ray calibration dummy (RP) or the coordinate system OW of the volume to be reconstructed and of a coordinate system (OR) assigned to the X-ray machine (10) and
- c) determining the transformation relationship between the coordinate system (OR) of the X-ray machine (10) and the coordinate system (OP) of the X-ray calibration dummy (RP) or the coordinate system (OW) of the volume to be reconstructed.
A medical system comprising:
- a position-acquisition system (30), an adjustable C-shaped X-ray machine (10), and an X-ray calibration dummy (RP),
- the X-ray calibration dummy (RP) having first markings (3) that will appear on X-ray images,
- the X-ray machine (10) and the X-ray calibration dummy (RP) being provided with second markings (4) that may be acquired by the position-acquisition system (30),
- the X-ray machine (10) and the X-ray calibration dummy (RP) being orientable relative to one another in a calibration operation such that a transformation relationship between a coordinate system (Op) inscribed on the X-ray calibration dummy (RP) or a coordinate system (Ow) of a volume to be reconstructed of an object (P) to be X-rayed by the X-ray machine (10) in a subsequent measurement on the object (P) and a coordinate system (OR) assigned to the X-ray machine (10) may be determined with the aid of the position-acquisition system (30),
- wherein the X-ray calibration dummy (RP) has a cylindrical shape, the first markings (3) being arranged in the form of a helix extending around a lateral surface (2) of the cylindrical shape and at least one of end (1) of the cylindrical shape having the second markings (4).
Dependencies are inferred from the claim text.