C-ARM INTEGRATED ELECTROMAGNETIC TRACKING SYSTEM

• US 20120289821A1
• Filed: 11/28/2011
• Published: 11/15/2012
• Est. Priority Date: 05/12/2011
• Status: Abandoned Application

• Current Assignee: Johns Hopkins University, Siemens AG
• Original Assignee: Johns Hopkins University, Siemens AG
• Inventors: Graumann, Rainer, Kleinszig, Gerhard, Siewerdsen, Jeffrey, Yoo, Jongheun
• Application Number:
  US13/304,951
• Publication Number:
  US 20120289821A1
• Time in Patent Office: Days
• US Class Current: 600/424
• CPC Class Codes: A61B 5/062 using magnetic field
• CPC Class Codes: A61B 6/08 Auxiliary means for directing the radiation beam to a particular spot, e.g. using light beams
• CPC Class Codes: A61B 6/12 Arrangements for detecting or locating foreign bodies
• CPC Class Codes: A61B 6/4405 the apparatus being movable or portable, e.g. handheld or mounted on a trolley
• CPC Class Codes: A61B 6/4423 related to hygiene or sterilisation
• CPC Class Codes: A61B 6/4441 the rigid structure being a C-arm or U-arm

Abstract

A medical imaging system and a method electromagnetically track a position of structures with the medical imaging system and a C-arm arrangement. The medical imaging system contains a C-arm, a gantry, and at least one electromagnetic field generator assembly with at least one electromagnetic field generator which interacts with an electromagnetic sensor from receiving the electromagnetic radiation. Preferably, the electromagnetic sensor is positioned within a region of surgical interest in a patient. The electromagnetic field generator is directly embedded into the C-arm.

Claims

1. A medical imaging system, comprising:

a C-arm having an x-ray detector and an x-ray emitter;

a gantry for supporting and supplying said C-arm;

a sensor assembly; and

at least one electromagnetic field generator assembly for emitting electromagnetic radiation to be received by said sensor assembly, said electromagnetic field generator assembly is directly embedded into said C-arm.

2. The medical imaging system according to claim 1, wherein the medical imaging system is selected from the group consisting of an x-ray system and a computer tomography system for use in image-guided surgical or interventional procedures.

3. The medical imaging system according to claim 1, wherein said electromagnetic field generator assembly is a window-shaped frame structure which is in-built at an open portion on said x-ray detector.

4. The medical imaging system according to claim 1, wherein said electromagnetic field generator assembly is directly embedded in said C-arm near a midpoint of a c-shaped c-arm.

5. The medical imaging system according to claim 1, wherein said electromagnetic field generator assembly contains a plurality of field generators, each of said field generators is directly incorporated into said C-arm.

6. The medical imaging system according to claim 1, wherein said electromagnetic field generator assembly contains distributed separate electromagnetic coils, each of said electromagnetic coils is directly embedded into said C-arm, so that said electromagnetic coils generate an electromagnetic field within an entire envelope of said C-arm.

7. The medical imaging system according to claim 1, wherein said sensor assembly contains at least one coil, said coil being placed within a patient to be examined with the medical imaging system.

8. The medical imaging system according to claim 1, further comprising an electromagnetic tracking system having a control unit, said control unit being directly integrated in said C-arm, being integrated in a separate trolley structure or in said gantry of said C-arm.

9. The medical imaging system according to claim 1, further comprising a shielding, at least one of said electromagnetic field generator assembly or said sensor assembly is shielded against said C-arm by using said shielding.

10. The medical imaging system according to claim 1, wherein an effect of ferromagnetic material with regard to an electromagnetic field of said electromagnetic field generator assembly is constant and can be calibrated.

11. The medical imaging system according to claim 3, wherein said window-shaped frame structure is selected from the group consisting of a rectangular frame structure and a circular frame structure.

12. A method for electromagnetically tracking a position of a medical structure during an x-ray procedure, using a medical imaging system containing a C-arm having an x-ray-detector and an x-ray-emitter, and at least one electromagnetic field generator assembly for emitting electromagnetic radiation, the electromagnetic field generator assembly being removable from or permanently embedded into the C-arm, which method comprises the steps of:

providing at least one electromagnetic sensor to the medical structure;

positioning the medical structure having the at least one electromagnetic sensor in the medical imaging system;

activating the at least one electromagnetic field generator assembly for emitting electromagnetic radiation to be received by the at least one electromagnetic sensor inside the medical structure;

measuring a local magnetic field strength at the electromagnetic sensor;

calculating a position of the at least one electromagnetic sensor based on a measured local magnetic field strength; and

tracking a position of the medical structure.

13. A C-arm of a medical imaging system, comprising:

an x-ray detector;

an x-ray emitter;

a C-arm body;

a gantry for supporting and supplying said C-arm body; and

at least one electromagnetic field generator assembly for emitting electromagnetic radiation, the electromagnetic field generator assembly is directly embedded into said C-arm body.