Method Of And A System For Adapting A Geometric Model Using Multiple Partial Transformations

• US 20090037154A1
• Filed: 09/20/2006
• Published: 02/05/2009
• Est. Priority Date: 09/23/2005
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Weese, Juergen, Peters, Jochen, Ecabert, Olivier
• Granted Patent: US 8,260,586 B2
• Time in Patent Office: Days
• US Class Current: 703/2
• CPC Class Codes: G06T 2207/10072 Tomographic images
• CPC Class Codes: G06T 2207/30048 Heart; Cardiac
• CPC Class Codes: G06T 7/12 Edge-based segmentation
• CPC Class Codes: G06T 7/149 involving deformable models, e.g. active contour models

Abstract

The invention relates to a method (100) of adapting a geometric model to an image data comprising determining a first partial transformation for mapping a first part of the geometric model into the image data and a second partial transformation for mapping a second part of the geometric model into the image data. By determining the first partial transformation of the first part of the geometric model and the second partial transformation of the second part of the geometric model, the geometric model can assume more shapes and therefore can be more accurately adapted to an object comprised in the image data.

Claims

1. An adaptation method (100) of adapting a geometric model to an image data comprising determining (115) a first partial transformation for mapping a first part of the geometric model into the image data and a second partial transformation for mapping a second part of the geometric model into the image data.

2. An adaptation method (100) as claimed in claim 1 further comprising a consistency step (115) for maintaining consistency of the adapted geometric model in a transition region between the first part and the second part of the partition model.

3. An adaptation method (100) as claimed in claim 1 wherein a cost function is a functional of the first partial transformation and of the second partial transformation and wherein the first partial transformation and the second partial transformation are determined by optimizing the cost function.

4. An adaptation method (100) as claimed in claim 2 wherein the transition region is comprised in the intersection of the first part and of the second part and wherein the consistency step comprises determining the global transformation in the transition region on basis of the first partial transformation and of the second partial transformation.

5. An adaptation method (100) as claimed in claim 2 further comprising constructing (115) a global transformation for mapping the geometric model into the image data using the first partial transformation and the second partial transformation.

6. An adaptation method (100) as claimed in claim 1 wherein the cost function is a functional of the global transformation.

7. An adaptation method (100) as claimed in claim 1 wherein the second part of the geometric model comprises a tubular structure and the second partial transformation is defined on basis of a shaping partial transformation for shaping a centerline of the tubular structure and/or of a scaling partial transformation for scaling the radius of a cross-section of the tubular structure.

8. An adaptation method (100) as claimed in claim 1 wherein the first partial transformation is an affine partial transformation.

9. An adaptation method (100) as claimed in claim 1 further comprising a segmenting step for segmenting the image data.

10. An adaptation system (300) for adapting a geometric model to an image data comprising a determining unit for determining a first partial transformation for mapping a first part of the geometric model into the image data and a second partial transformation for mapping a second part of the geometric model into the image data.

11. An image acquisition system (400) for acquiring an image data comprising an adaptation system (300) as claimed in claim 10.

12. A workstation (500) comprising an adaptation system (300) as claimed in claim 10.

13. A computer program product to be loaded by a computer arrangement, comprising instructions for adapting a geometric model to an image data, the computer arrangement comprising a processing unit and memory, the computer program product, after being loaded, providing said processing unit with the capability to determine a first partial transformation for mapping a first part of the geometric model into the image data and a second partial transformation for mapping a second part of the geometric model into the image data.