Method for detecting the exact contour of targeted treatment areas, in particular, the external contour

• US 6,178,345 B1
• Filed: 05/10/1999
• Issued: 01/23/2001
• Est. Priority Date: 06/30/1998
• Status: Active Grant

• Current Assignee: Brainlab AG
• Original Assignee: Brainlab Medizinische Computersysteme GmbH (Brainlab AG)
• Inventors: Birkenbach, Rainer, Vilsmeier, Stefan
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US09/309,097
• Time in Patent Office: 624 Days
• Field of Search: 600/425
• US Class Current: 600/425
• CPC Class Codes: G06T 2207/10072 Tomographic images
• CPC Class Codes: G06T 2207/30016 Brain
• CPC Class Codes: G06T 2207/30096 Tumor; Lesion
• CPC Class Codes: G06T 7/12 Edge-based segmentation

Abstract

A method for mapping surgical target site contours precisely, especially the outer contour thereof, comprises the following steps:

producing a plane slice image through the surgery site in the region of the surgery target whereby the plane of the slice image is located substantially perpendicular to a a plane of symmetry of the surgery target site;

assigning the images split by the plane of symmetry, more particularly by mirrowing at the plane of symmetry; and

establishing the difference in the image contents between the assigned split images and processing the resulting information to determine the location of the contour of the surgery target site, especially the outer contour thereof in the plane of the slice image.

Claims

1. A method for mapping surgical target site contours precisely, especially the outer contour thereof, comprising the following steps:

producing a plane slice image through the surgery site in the region of the surgery target whereby the plane of the slice image is located substantially perpendicular to a a plane of symmetry of the surgery target site;

assigning the images split by the plane of symmetry, more particularly by mirrowing at the plane of symmetry; and

establishing the difference in the image contents between the assigned split images and processing the resulting information to determine the location of the contour of the surgery target site, especially the outer contour thereof in the plane of the slice image.

2. The method as set forth in claim 1 wherein the slice image is produced by means of an imaging method, more particularly a CT, MRI, PET or SPECT method.

3. The method as set forth in claim 1 wherein assigning the split images is done computer-assisted by means of stored slice image data.

4. The method as set forth in claim 3 wherein the mapping data of the contour, especially the outer contour, may be stored and following sensing in several planes of the slice image made use of to define the complete contour, especially the outer contour of the surgery target site.

5. The method as set forth in claim 1 wherein establishing the difference in the image contents is done via differentiation of locally assigned color or gray scale values in the various split images.

6. The method as set forth in claim 1 wherein in brain surgery the brain centerline is made use for assigning the images split by the the axis of symmetry, especially as the mirrowing axis.