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United States Patent 6,990,368
Simon ,   et al. January 24, 2006
Method and apparatus for virtual digital subtraction angiography


Abstract

A medical imaging system is provided that detects any change in relative position between the patient and the imaging device and corrects the image data for any motion that occurs. The medical imaging system includes: an imaging device for capturing two or more image data sets representative of a patient; a tracking subsystem for capturing patient position data that is indicative of the position of the patient and device position data that is indicative of the position of the imaging device; an image subtraction subsystem for performing a digital subtraction operation between at least two image data sets; and a motion correction subsystem configured to detect a change in the relative position between the patient and the imaging device and, upon detecting a change in the relative position, compensate in at least one of the first image data set and the second image data set for the change in relative position prior to performing the digital subtraction operation.

Inventors: Simon; David A. (Boulder, CO); Foley; Kevin (Germantown, TN); Hunter; Mark (Broomfield, CO)
Assignee: Surgical Navigation Technologies, Inc. (Louisville, CO)
Appl. No.: 10/116,631
Filed: April 4, 2002

Current U.S. Class: 600/425 ; 378/21
Current International Class: A61B 5/05 (20060101); A61B 6/00 (20060101)
Field of Search: 600/425,408,411,415,416,417,419,426,427,428,429 378/21,23,25 382/128

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Primary Examiner: Robinson; Daniel
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.
Claims


What is claimed is:

1. A medical imaging system, comprising: an imaging device operable to capture two or more image data sets representative of a patient; a tracking subsystem operable to detect patient position data corresponding to each image data set and device position data corresponding to each image data set, where the patient position data is indicative of the position of the patient and the device position data is indicative of the position of the imaging device; a motion correction subsystem adapted to receive patient position data corresponding to the first and second image data set and device position data corresponding to the first and second image data set, and the motion correction subsystem is operable to detect a change in relative position between the patient and the imaging device; and an image subtraction subsystem adapted to receive at least a first image data set and a second image data set from the imaging device, the image subtraction subsystem is operable to perform a digital subtraction operation between the first image data set and the second image data set when no substantial change occurs in the relative position between the patient and the imaging device.

2. The medical imaging system of claim 1 wherein the imaging device includes an image source operable to emanate radiation towards the patient and an image receiver positioned to receive radiation from the image source.

3. The medical imaging system of claim 1 wherein the imaging device is selected from the group consisting of an x-ray imaging device, a computed tomography imaging device and a magnetic resonance imaging device.

4. The medical imaging system of claim 1 wherein the tracking subsystem is further defined as an infrared tracking sensor.

5. The medical imaging system of claim 1 wherein the imaging device further includes a plurality of tracking targets that are detectable by the tracking subsystem.

6. The medical imaging system of claim 1 further comprises a reference frame marker positioned in a fixed location relative to the patient, where the reference frame marker includes tracking targets that are detectable by the tracking subsystem.

7. The medical imaging system of claim 6 wherein the reference frame marker is physically attached to a portion of the patient.

8. The medical imaging system of claim 1 wherein the motion correction subsystem is further operable to generate an operator alarm upon detection of a change in the relative position between the patient and the imaging device.

9. The medical imaging system of claim 1 further comprising a surgical instrument having tracking targets that are detectable by the tracking subsystem, such that the tracking subsystem detects in real-time instrument position data indicative of the position of the surgical instrument.

10. The medical imaging system of claim 9 wherein the motion correction subsystem is adapted to receive instrument position data from the tracking subsystem and operable to compensate for a change in the position of the surgical instrument in at least one of the first image data set and the second image data set.