Non-rigid composition of multiple overlapping medical imaging volumes

• US 9,082,159 B2
• Filed: 10/06/2011
• Issued: 07/14/2015
• Est. Priority Date: 10/07/2010
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Reisman, James G.
• Primary Examiner(s): Bella, Matthew
• Assistant Examiner(s): YANG, WEI WEN
• Application Number:
  US13/817,946
• Publication Number:
  US 20130208960A1
• Time in Patent Office: 1,377 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06T 3/00 Geometric image transformations in the plane of the image
• CPC Class Codes: G06T 3/4038 Image mosaicing, e.g. composing plane images from plane sub-images
• CPC Class Codes: G06T 7/30 Determination of transform parameters for the alignment of images, i.e. image registration

Abstract

A method, including: registering a new image volume with a composed image volume, wherein the new image volume and the composed image volume overlap each other in an overlap region, the composed image volume includes at least two image volumes that overlap each other, and each voxel in the composed image volume includes a weight; determining a deformation between the new image volume and the composed image volume; updating the weights of the voxels in the composed image volume that are overlapped by the new image volume; performing an alpha morphing on the overlap region using the updated weights and the deformation; obtaining a blend region of the overlap region by performing an alpha blending using results of the alpha morphing and the updated weights; and incorporating the blend region into the composed image volume to obtain a new composed image volume.

Claims

1. A method, comprising:

registering a new image volume with a composed image volume, wherein the new image volume and the composed image volume overlap each other in an overlap region, the composed image volume includes at least two image volumes that overlap each other, and each voxel in the composed image volume includes a weight;

determining a deformation between the new image volume and the composed image volume;

updating the weights of the voxels in the composed image volume that are overlapped by the new image volume;

performing an alpha morphing on the overlap region using the updated weights and the deformation;

obtaining a blend region of the overlap region by performing an alpha blending using results of the alpha morphing and the updated weights; and

incorporating the blend region into the composed image volume to obtain a new composed image volume,

wherein the weight of a voxel in a single image volume is based on its distance from an edge of the single image volume,

wherein the weight of a voxel in the composed image volume, where this voxel is included in a region of the composed image volume where the at least two image volumes overlap, is equal to a sum of the weights of the corresponding voxels from the at least two image volumes,

wherein updating the weights of the voxels in the composed image volume that are overlapped by the new image volume comprises;

for each voxel of the composed image volume overlapped by the new image volume, adding the weight of the corresponding voxel from the new image volume to the weight of that voxel in the composed image volume.

2. The method of claim 1, wherein the new image volume and the composed image volume include medical image volumes.

3. The method of claim 1, wherein the new image volume and at least one of the image volumes included in the composed image volume each have an arbitrary orientation.

4. The method of claim 1, wherein the alpha morphing and the alpha blending each include an alpha variable, the alpha variable being a ratio of the weights of the voxels in the new image volume to the weights of the voxels of the composed image volume.

5. A computer program product, comprising:

a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising;

computer readable program code configured to perform the steps of;

registering a new image volume with a composed image volume, wherein the new image volume and the composed image volume overlap each other in an overlap region, the composed image volume includes at least two image volumes that overlap each other, and each voxel in the composed image volume includes a weight;

determining a deformation between the new image volume and the composed image volume;

updating the weights of the voxels in the composed image volume that are overlapped by the new image volume;

performing an alpha morphing on the overlap region using the updated weights and the deformation;

obtaining a blend region of the overlap region by performing an alpha blending using results of the alpha morphing and the updated weights; and

incorporating the blend region into the composed image volume to obtain a new composed image volume,

wherein the weight of a voxel in a single image volume is based on its distance from an edge of the single image volume,

wherein the weight of a voxel in the composed image volume, where this voxel is included in a region of the composed image volume where the at least two image volumes overlap, is equal to a sum of the weights of the corresponding voxels from the at least two image volumes,

wherein updating the weights of the voxels in the composed image volume that are overlapped by the new image volume comprises;

for each voxel of the composed image volume overlapped by the new image volume, adding the weight of the corresponding voxel from the new image volume to the weight of that voxel in the composed image volume.

6. The computer program product of claim 5, wherein the new image volume and the composed image volume include medical image volumes.

7. The computer program product of claim 5, wherein the new image volume and at least one of the image volumes included in the composed image volume each have an arbitrary orientation.

8. The computer program product of claim 5, wherein the alpha morphing and the alpha blending each include an alpha variable, the alpha variable being a ratio of the weights of the voxels in the new image volume to the weights of the voxels of the composed image volume.

9. A system, comprising:

a memory device for storing a program;

a processor in communication with the memory device, the processor operative with the program to;

register a new image volume with a composed image volume, wherein the new image volume and the composed image volume overlap each other in an overlap region, the composed image volume includes at least two image volumes that overlap each other, and each voxel in the composed image volume includes a weight;

determine a deformation between the new image volume and the composed image volume;

update the weights of the voxels in the composed image volume that are overlapped by the new image volume;

perform an alpha morphing on the overlap region using the updated weights and the deformation;

obtain a blend region of the overlap region by performing an alpha blending using results of the alpha morphing and the updated weights; and

incorporate the blend region into the composed image volume to obtain a new composed image volume,

wherein the weight of a voxel in a single image volume is based on its distance from an edge of the single image volume,

wherein the weight of a voxel in the composed image volume, where this voxel is included in a region of the composed image volume where the at least two image volumes overlap, is equal to a sum of the weights of the corresponding voxels from the at least two image volumes,

wherein when updating the weights of the voxels in the composed image volume that are overlapped by the new image volume, the processor is operative with the program to;

for each voxel of the composed image volume overlapped by the new image volume, add the weight of the corresponding voxel from the new image volume to the weight of that voxel in the composed image volume.

10. The system of claim 9, wherein the new image volume and the composed image volume include medical image volumes.

11. The system of claim 9, wherein the new image volume and at least one of the image volumes included in the composed image volume each have an arbitrary orientation.

12. The system of claim 9, wherein the alpha morphing and the alpha blending each include an alpha variable, the alpha variable being a ratio of the weights of the voxels in the new image volume to the weights of the voxels of the composed image volume.