Visual enhancement of interval changes using rigid and non-rigid transformations
View Patent ↗An image point in a displayed reference image R is selected and a non-rigid transformation resulting in a transformation field g(r R ) mapping every location r R to a corresponding location r F in a floating image F is applied, next a rigid body transformation is applied to floating image F such that r F coincides with the selected image point and the transformed floating image is displayed.
1. A method of displaying corresponding structures in a reference image R, a floating image F, and a subtraction image, the method comprising:
displaying reference image R,
selecting an image point r R in reference image R corresponding with a viewpoint q(x,y,z),
applying a non-rigid transformation resulting in a transformation field g(r R ) mapping every location r R to a corresponding location r F in the floating image F,
applying a rigid body transformation to floating image F such that r F coincides with q(x,y,z),
displaying the rigid body transformed floating image,
convolving a reference image R with a window function H w to generate R w ,
convolving floating image F with the same window function H w to generate F w ,
generating a subtraction image by performing subtraction R w (r R )−F w (g(r R )), displaying said subtraction image.
2. A method of displaying according to claim 1 wherein said rigid body transformation is a translation.
3. A method of displaying according to claim 1 wherein three orthogonal views of an image are shown.
4. A method of displaying according to claim 1 , further comprising showing different views of a subtraction image.
5. A method of displaying according to claim 1 wherein the size of said window function is related to the dimensions of said structures.
6. A computer software product for displaying corresponding structures in a reference image R, a floating image F, and a subtraction image, the product comprising a non-transitory computer-readable medium in which program instructions are stored, which instructions, when read by a computer, cause the computer to:
display reference image R,
select an image point r R in reference image R corresponding with a viewpoint q(x,y,z),
apply a non-rigid transformation resulting in a transformation field g(r R ) mapping every location r R to a corresponding location r F in the floating image F,
apply a rigid body transformation to floating image F such that r F coincides with q(x,y,z),
display the rigid body transformed floating image,
convolve a reference image R with a window function H w to generate R w ,
convolve floating image F with the same window function H w to generate F,
generate a subtraction image by performing subtraction R w (r R )−F w (g(r R )), and display said subtraction image.
7. A computer software product for displaying corresponding structures in a reference image R, a floating image F, and a subtraction image, which product, when executed by a computer, causes the computer to:
display reference image R with a viewer of the computer,
enable a user to select an image point r R in reference image R corresponding with a viewpoint q(x,y,z),
apply a non-rigid transformation resulting in a transformation field g(r R ) mapping every location r R to a corresponding location r F in the floating image F,
apply a rigid body transformation to floating image F such that r F coincides with q(x,y,z),
display the rigid body transformed floating image on the viewer of the computer,
convolve a reference image R with a window function H w to generate R w ,
convolve floating image F with the same window function H w to generate F w ,
generate a subtraction image by performing subtraction R w (r R )−F w (g(r R )), and display said subtraction image on the viewer of the computer.
8. A product according to claim 7 wherein said rigid body transformation is a translation.
9. A product according to claim 7 wherein the product causes the computer to show three orthogonal views of an image.
10. A product according to claim 7 wherein the product causes the computer to show different views of a subtraction image on the viewer of the computer.
11. A product according to claim 7 wherein the size of said window function is related to the dimensions of said structures.
12. A product according to claim 6 wherein said rigid body transformation is a translation.
13. A product according to claim 6 wherein the product causes the computer to show three orthogonal views of an image.
14. A product according to claim 6 wherein the product causes the computer to show different views of a subtraction image.
15. A product according to claim 6 wherein the size of said window function is related to the dimensions of said structure.