Marker localization sensing system synchronized with radiation source

• US 7,684,849 B2
• Filed: 12/31/2003
• Issued: 03/23/2010
• Est. Priority Date: 12/31/2003
• Status: Active Grant

• Current Assignee: Varian Medical Systems Incorporated (Siemens AG)
• Original Assignee: Calypso Medical Technologies, Inc. (Siemens AG)
• Inventors: Wright, J. Nelson, Newell, Laurence J.
• Primary Examiner(s): Casler; Brian
• Assistant Examiner(s): KISH, JAMES M
• Application Number:
  US10/750,164
• Publication Number:
  US 20050154283A1
• Time in Patent Office: 2,274 Days
• Field of Search: 600/424
• US Class Current: 600/424
• CPC Class Codes: A61B 2034/2051 Electromagnetic tracking systems
• CPC Class Codes: A61B 5/06 Devices, other than using radiation, for detecting or locating foreign bodies for removing same A61B17/50 ; determining position of probes within or on the body of the patient
• CPC Class Codes: A61B 5/062 using magnetic field

Abstract

A receiver for determining the location of a marker that is excited with an exciting waveform. A sensing array having coils is used to sense magnetic flux from the resonating marker. The coils provide inputs to the receiver. The receiver includes a correlation processor for analyzing the inputs in a coherent manner. Further, the receiver is synchronized to act on inputs that are gathered when a treatment radiation source is inactive.

Claims

1. A receiver that receives a plurality of inputs indicative of a sensed magnetic flux induced by a marker, said marker excited by an excitation source, said receiver comprising:

a sensor configured to receive a plurality of inputs;

a correlation processor for analyzing said plurality of inputs in a coherent manner and for generating a subset of the plurality of inputs by discarding corrupted inputs from the plurality of inputs, wherein inputs that are acquired when a therapeutic radiation source is active are considered corrupted.

2. The receiver of claim 1 wherein said therapeutic radiation source is used in the treatment of a human.

3. The receiver of claim 1 further including a matched filter that is adapted to detect interference from said therapeutic radiation source.

4. The receiver of claim 1 further including a signal line between said therapeutic radiation source and said receiver that carries a signal indicative of activity of said therapeutic radiation source.

5. The receiver of claim 1 wherein said therapeutic radiation source is a linear accelerator.

6. A method of irradiating a patient with radiation from a therapeutic radiation source, said radiation targeted by the use of a marker associated into said patient, the method comprising:

applying an excitation to said marker using an excitation source;

using a receiver to receive a plurality of inputs indicative of a sensed magnetic flux induced by said marker in response to said excitation;

discarding selected data from said plurality of inputs to generate a subset of the plurality of inputs such that said subset of the plurality of inputs includes data gathered when said receiver was not subject to interference from said therapeutic radiation source; and

using a processor to perform an analysis on said subset of the plurality of inputs in a coherent manner to locate said marker.

7. The method of claim 6 wherein said therapeutic radiation source is used in the treatment of a human.

8. The method of claim 6 wherein said receiver includes a matched filter that is adapted to detect interference from said therapeutic radiation source.

9. The method of claim 6 wherein said receiver includes a signal line between said therapeutic radiation source and said receiver that carries a signal indicative of activity of said therapeutic radiation source.

10. The method of claim 6 wherein said therapeutic radiation source is a linear accelerator.

11. A method of irradiating a patient with radiation from a therapeutic radiation source, said radiation targeted by the use of a marker associated into said patient, the method comprising:

applying an excitation to said marker using an excitation source;

using a receiver to receive a plurality of inputs indicative of a sensed magnetic flux induced by said marker in response to said excitation;

discarding corrupted inputs subject to interference from said therapeutic radiation source from said plurality of inputs to create a subset of said plurality of inputs; and

using a processor to perform an analysis on said subset to locate said marker.

12. The method of claim 11 wherein said therapeutic radiation source is used in the treatment of a human.

13. The method of claim 11 wherein said receiver includes a matched filter that is adapted to detect interference from said therapeutic radiation source.

14. The method of claim 11 wherein said receiver includes a signal line between said therapeutic radiation source and said receiver that carries a signal indicative of activity of said therapeutic radiation source.

15. The method of claim 11 wherein said therapeutic radiation source is a linear accelerator.