Method for determining location and movement of a moving object

• US 7,911,207 B2
• Filed: 05/19/2008
• Issued: 03/22/2011
• Est. Priority Date: 11/16/2005
• Status: Active Grant

• Current Assignee: Board of Regents of the University of Texas System (University of Texas System), U.S. Government Represented By The Department Of Veterans Affairs
• Original Assignee: Board of Regents of the University of Texas System (University of Texas System)
• Inventors: Zaremba, Andrei A., MacFarlane, Duncan L., Briggs, Richard, White, Keith D.
• Primary Examiner(s): Shrivastav; Brij B
• Application Number:
  US12/152,917
• Publication Number:
  US 20090039235A1
• Time in Patent Office: 1,037 Days
• Field of Search: 324300-322, 600407-445
• US Class Current: 324/307
• CPC Class Codes: G01R 33/28 Details of apparatus provided for in groups G01R33/44 - G01R33/64
• CPC Class Codes: G01R 33/4806 Functional imaging of brain activation
• CPC Class Codes: G01R 33/543 Control of the operation of the MR system, e.g. setting of acquisition parameters prior to or during MR data acquisition, dynamic shimming, use of one or more scout images for scan plane prescription G01R33/546 takes precedence
• CPC Class Codes: G01R 33/56509 due to motion, displacement or flow, e.g. gradient moment nulling G01R33/567 takes precedence
• CPC Class Codes: G01V 8/20 using multiple transmitters or receivers

Abstract

The present invention discloses a method for determining location and movement of a moving object. One embodiment of the method tracks the movement of a target during medical imaging scanning and transmits the position shift to the medical imaging scanning device in real time. The method includes the steps of projecting structured light on the target, receiving the reflection of structured light, converting the received structured light into spatial positions, and transmitting the positional shift to the medical imaging scanning device. The method further includes the step of adjusting the medical imaging scanning device in response to the positional change to increase accuracy.

Claims

1. A motion tracking method for determining the location and orientation of at least one object being imaged by a medical imaging device and moving in space relative to a motion tracking device, comprising the steps of:

affixing a target on the object;

projecting a structured light pattern onto the target;

receiving return light from the target through an optical receiver on the motion tracking device;

converting the return light into a first digital image and a second digital image; and

comparing the first digital image and the second digital image to obtain object motion information.

2. The method of claim 1, further comprising the step of adjusting an MRI scan to compensate for the object motion information.

3. The method of claim 1, further comprising the step of placing the target inside an MRI apparatus.

4. The method of claim 1, further comprising the step of coordinating the target with a patient surface.

5. The method of claim 3, further comprising the step of originating the structured light pattern within the MRI apparatus.

6. The method of claim 1, further comprising the step of generating the structured light pattern from a source selected from a group consisting of:

a low-intensity pulsed light source, or continuous light source.

7. The method of claim 1 further comprising the step of sensitizing the optical receiver to at least one non-visible frequency.

8. The method of claim 2, further comprising the step of transmitting the object motion information to a computer for alignment of the medical imaging device.

9. The method of claim 2, further comprising the step of guiding an interventional procedure with the object motion information.

10. The method of claim 2, further comprising the step of evaluating changes in brain images with the object motion information acquired over time periods selected from the group consisting of minutes, hours, days, weeks, and months, or a combination thereof.

11. A method for detecting position changes of a moving patient during a medical imaging operation, comprising the steps of:

locating a target on the moving patent;

generating a structured light coupled to the target;

receiving the structured light through an optical receiver;

converting the structured light into coordinate data;

measuring an initial position of the moving patient with the structured light;

measuring a second position of the moving patient with the structured light;

determining a position shift between the initial position and second position; and

transmitting the position shift to a medical imaging device.

12. The method of claim 11, further comprising the step of adjusting the medical device to correct for the position shift.

13. The method of claim 11, wherein the step of transmitting further comprises:

transmitting the position shift to an MRI device.

14. The method of claim 11, wherein the step of generating structured light further comprises the steps of:

providing a structured light projector; and

,

focusing the structured light projector on a patient.

15. The method of claim 11, wherein the step of generating structured light further comprises:

attaching a reflective pattern to a patient; and

irradiating the pattern with a coherent light source.

16. The method of claim 11, wherein the step of receiving includes the step of pulling a CCD camera.

17. The method of claim 15, wherein the step of receiving includes receiving at least two frequencies of light.

18. The method of claim 11, wherein the step of generating includes the step of using a laser focused through a filter that acts as a structured light generator.

19. A method of analyzing movement of an object being imaged by a medical imaging device and moving in space relative to a motion tracking device, comprising the steps of:

affixing a light source to the object;

generating a structured light from the light source;

receiving structured light from the object into an optical receiver on the motion tracking device;

converting the structured light into a first digital image and a second digital image; and

comparing the first digital image and the second digital image to determine movement of the object.