Medical imaging system for displaying, manipulating and analyzing three-dimensional images

• US 6,175,655 B1
• Filed: 09/19/1996
• Issued: 01/16/2001
• Est. Priority Date: 09/19/1996
• Status: Expired due to Term

• Current Assignee: 3D Medical Imaging Systems LLC
• Original Assignee: Integrated Medical Systems Incorporated (Steris Corporation)
• Inventors: George, III, Frederick W., Kraske, Wolfgang F.
• Primary Examiner(s): Tran, Phuoc
• Assistant Examiner(s): Mariam, Daniel G.
• Application Number:
  US08/715,920
• Time in Patent Office: 1,580 Days
• Field of Search: 382/131, 382/257, 382/258, 382/259, 382/102, 382/108, 382/133, 382/175, 382/256, 382/261, 382/308, 358/451
• US Class Current: 382/257
• CPC Class Codes: G16H 30/20 for handling medical images, e.g. DICOM, HL7 or PACS
• CPC Class Codes: G16H 30/40 for processing medical images, e.g. editing
• CPC Class Codes: G16H 50/50 for simulation or modelling of medical disorders
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass

Abstract

A method and device for generating, displaying and manipulating three-dimensional images for medical applications is provided. The method creates a three-dimensional images from MRI or other similar medical imaging equipment. The medical imaging system allows a user to view the three-dimensional model at arbitrary angles, vary the light or color of different elements, and to remove confusing elements or to select particular organs for close viewing. Selection or removal of organs is accomplished using fuzzy connectivity methods to select the organ based on morphological parameters.

Claims

1. A method for isolating anatomical structures contained within a three-dimensional data set, the method comprising the steps of:

forming a morphological skeleton of the three-dimensional data set;

selecting a single seed data point consisting of a single voxel within the morphological skeleton, the seed data point being contained within a desired anatomical structure; and

utilizing fuzzy connectivity to define additional data points of the desired anatomical structure to reconstruct substantially only the desired anatomical structure, wherein reconstruction of substantially only the desired anatomical structure facilitates viewing and analysis thereof.

2. The method as in claim 1, wherein the step of forming a morphological skeleton comprises recursive opening and erosion of the three-dimensional data set to form a plurality of residuals which define the morphological skeleton.

3. The method as in claim 1, wherein the step of forming a morphological skeleton comprises utilizing a generally spherical structuring element in recursive opening and erosion of the three-dimensional data set.

4. The method as in claim 1, wherein the step of selecting a seed data point comprises positioning a cursor at a desired point on an image displayed on a monitor.

5. The method as in claim 1, wherein the step of using fuzzy connectivity to define additional data points of the desired anatomical structure comprises defining connectivity based upon a size and shape of a structuring element utilizing a fuzzy generalization of mathematically defined distances between sets of data points as a criterion.

6. The method as in claim 1, wherein the step of reconstructing substantially only the desired anatomical structure comprises recursive dilation and closing of a selected portion of the morphological skeleton.

7. The method as in claim 1, wherein the step of utilizing fuzzy connectivity to define additional data points comprises defining connectivity based on the use of a generally spherical structuring element for defining distances between adjacent data points.

8. The method as in claim 1, wherein the three-dimensional data set comprises a data set generated by a device selected from a group consisting of:

a magnetic resonance imaging device;

a computer aid tomography device; and

a positron emission tomography.

9. A method for reconstructing an anatomical structure from a morphological skeleton comprising:

selecting a single seed data point consisting of a single voxel within the morphological skeleton, the seed data point being contained within the desired anatomical structure; and

utilizing fuzzy connectivity to define additional data points of the desired anatomical structure to reconstruct substantially only the desired anatomical structure, wherein the use of fuzzy connectivity results in reconstruction of substantially only the desired anatomical structure and substantially lacks surrounding tissue.

10. A method for fusing data from at least a first and a second medical image comprising the steps of:

reducing the second image to a size and scale corresponding to the first image;

converting the second image into a coordinate system corresponding to a predetermined coordinate utilized by a computer;

converting the first image into a coordinate system corresponding to the predetermined coordinate utilized by the computer;

using different resolutions and computer distance metrics to align the first image and the second image;

forming a first morphological skeleton of the first image;

forming a second morphological skeleton of the second image;

combining the first morphological skeleton with the second morphological skeleton into a fused skeleton;

selecting a single seed data point consisting of a single voxel within the fused skeleton, the seed data point being contained within a desired anatomical structure; and

utilizing fuzzy connectivity to define additional data points to be combined and added to the desired anatomical structure.

11. The method for fusing data from at least a first and second medical image as in claim 10, wherein conversions of the second image into the predetermined coordinate system and conversion of the first image into the predetermined coordinate system is accomplished using a series of rotations and translations.

12. The method for fusing data from at least a first and second medical image as in claim 10, wherein the first morphological skeleton is combined with the second morphological skeleton by adding each pixel value in the first skeleton with a corresponding pixel value in the second skeleton, wherein the corresponding pixel in the fused skeleton is assigned a sum of the pixel values.

13. The method for fusing data from at least a first and second medical image as in claim 10, wherein the first morphological skeleton is combined with the second morphological skeleton by comparing each pixel value in the first skeleton with a corresponding pixel value in the second skeleton, wherein the corresponding pixel in the fused skeleton is assigned a value of the larger value of the pixel in the first skeleton and the pixel in the second skeleton.

14. The method for fusing data from at least a first and second medical image as in claim 10, wherein the first morphological skeleton is combined with the second morphological skeleton by comparing each pixel value in the first skeleton with a corresponding pixel value in the second skeleton, wherein the corresponding pixel in the fused skeleton is assigned a value of the smaller value of the pixel in the first skeleton and the pixel in the second skeleton.

15. The method for fusing data from at least a first and second medical image as in claim 10, wherein a fuzzy correction is conducted on the data points before fuzzy reconstruction is performed.