Method and apparatus for matching at least one visualized medical measured result with at least one further dataset containing spatial information

• US 7,010,175 B2
• Filed: 02/21/2002
• Issued: 03/07/2006
• Est. Priority Date: 02/23/2001
• Status: Active Grant

• Current Assignee: Siemens Healthcare GMBH (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Scheuering, Michael, Herold, Gerold, Barfuss, Helmut, Wach, Siegfried
• Primary Examiner(s): Mancuso, Joseph
• Assistant Examiner(s): GORADIA, SHEFALI DINESH
• Application Number:
  US10/081,815
• Publication Number:
  US 20020118867A1
• Time in Patent Office: 1,475 Days
• Field of Search: 382/128, 382/154, 382/294, 382/132
• US Class Current: 382/294
• CPC Class Codes: G06V 10/752 Contour matching

Abstract

In a method and apparatus for matching at least one visualized medical measured result of a test subject with at least one dataset of the test subject by means of landmarks, landmarks with respect to the displayed test subject are defined in every visualized measured result to be matched and every dataset to be matched. The geometrical arrangement of the landmarks in every measured result and each dataset is analyzed by a first algorithm, and subsequently an allocation of corresponding landmarks of the at least one visualized measured result and of the at least one dataset to form a landmark pair ensues with a second algorithm.

Claims

1. A method for matching two or more visualized measured results obtained with a medical device from an examination subject comprising:

arranging two or more landmarks in a first visualized measured result in a geometrical arrangement;

determining if a sufficient number of landmarks has been arranged in said first visualized measured result, and, if yes, analyzing a spatial allocation of said arranged landmarks in said first visualized measured result using a first algorithm;

arranging two or more landmarks in a second visualized measured result in a geometrical arrangement;

determining if a sufficient number of landmarks has been arranged in said second visualized measured result, and, if yes, analyzing a spatial arrangement of said arranged landmarks in said second visualized measured result using said first algorithm, and

allocating respectively matching landmarks from said first and second visualized measured result to form landmark pairs using a second algorithm based on the analyzing results from the first algorithm.

2. The method as claimed in claim 1 further comprising using said first algorithm to calculate absolute spacings among said landmarks in the respective visualized measured results, and using the second algorithm to allocate corresponding landmarks in at least one visualized measured result using the absolute spacings calculated with said first algorithm.

3. The method as claimed in claim 1 further comprising using said first algorithm to calculate relative spacings among said landmarks in the respective visualized measured results, and using the second algorithm to allocate corresponding landmarks in at least one visualized measured result using the relative spacings calculated with said first algorithm.

4. The method as claimed in claim 1 further comprising, in said second algorithm, permutating the allocation of the landmarks until a predetermined high coincidence is reached.

5. The method as claimed in claim 4 further comprising, in said second algorithm, permutating the allocation of said landmarks until 90% of said landmarks are allocated.

6. The method as claimed in claim 1 further comprising, in said second algorithm, recognizing and rejecting false landmarks.

7. The method as claimed in claim 1 further comprising automatically defining at least one of said landmarks using data underlying the respective visualized measured results.

8. The method as claimed in claim 7 further comprising physically attaching markers to said examination subject, and automatically defining said at least one landmark automatically with a pattern recognition algorithm.

9. The method as claimed in claim 1 further comprising:

conducting a two-dimensional matching of said at least one visualized measured result and at least one dataset, and

defining said landmarks according to the steps of;

defining at least three landmarks in an arbitrary sequence in said at least one visualized measured result with reference to a displayed image of said examination subject, with at least one of said landmarks being differently spaced from a remainder of said landmarks to prohibit an over all symmetrical arrangement of the at least three landmarks; and

defining said at least three landmarks in an arbitrary sequence in each of said datasets with reference to said displayed image of said examination subject, with at least three of said landmarks in each dataset corresponding to two arbitrary landmarks and said landmark that is differently spaced from the remainder of said landmarks.

10. The method as claimed in claim 1 further comprising defining said geometrical arrangement of said landmarks using said first algorithm before defining said landmarks in at least one dataset.

11. The method as claimed in claim 1 further wherein the step of analyzing said landmarks with said first algorithm comprises analyzing all of said landmarks in common with said first algorithm only after all of said landmarks are defined in said at least one visualized measured result.

12. An apparatus for matching two or more visualized measured results obtained with a medical device from an examination subject containing information from said examination subject, comprising:

a landmark definition unit for defining and arranging two or more landmarks in a first visualized measured result in a geometrical arrangement and two or more landmarks in a second visualized measured result in a geometrical arrangement;

an analysis unit for determining if a sufficient number of landmarks has been arranged in said first and second visualized measured result, and if yes for either, analyzing an appertaining spatial allocation of said arranged landmarks in said first visualized measured result and said second visualized measured result, respectively, using a first algorithm; and

an allocation unit for matching landmarks from said first and second visualized measured result to form landmark pairs using a second algorithm based on the analyzing results from the first algorithm.

13. The apparatus as claimed in claim 12 wherein said landmark definition unit defines at least one of said landmarks using data underlying said at least one visualized measured result.

14. The apparatus as claimed in claim 13, further comprising markers adapted for direct application to said examination subject and wherein said definition unit automatically identifies at least one of said markers, as at least one of said landmarks, using a pattern recognition algorithm.

15. The apparatus as claimed in claim 12 wherein said definition unit, said analysis unit and said allocation unit in combination form a computer with a picture screen and an input unit.

16. The apparatus as claimed in claim 15 wherein said input unit is a computer mouse.

17. The apparatus as claimed in claim 12 further comprising a memory, accessible at least by said definition unit, in which said at least one visualized measured result.

18. The apparatus as claimed in claim 17 wherein said memory also stores landmarks defined in said at least one visualized measured result.

19. The apparatus as claimed in claim 17 wherein said memory also stores landmarks defined in at least one dataset.

20. The apparatus as claimed in claim 17 wherein said memory also stores landmarks defined in said at least one visualized measured result and at least one dataset.