Visual enhancement of interval changes using temporal subtraction, convolving, and non-rigid transformation field mapping
View Patent ↗Method to bring out a temporal difference between corresponding structures in a reference image R and a floating image F by convolving the reference image R and the floating image F with a window function H w to generate R w and F w , 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 and generating a subtraction image by performing subtraction R w (r)−F w (g(r)) wherein r represents a voxel (x, y, z) in reference image R.
1. A method to bring out a temporal difference between corresponding structures in a reference image R and a floating image F, the method comprising:
convolving said reference image R with a window function H w to generate R w ,
convolving said floating image F with the same window function H w to generate F w ,
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,
generating a subtraction image by performing subtraction R W (r)−F w (g(r)) wherein r represents a voxel (x, y, z) in the reference image R.
2. A method according to claim 1 wherein said window function is an averaging function.
3. A method according to claim 2 wherein the size of said window function is related to the dimensions of said structure.
4. A method according to claim 1 wherein the size of said window function is related to the dimensions of said structure.
5. A computer software product for bringing out a temporal difference between corresponding structures in a reference image R and a floating image F, 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:
convolve said reference image R with a window function H w to generate R w ,
convolve said floating image F with the same window function H w to generate F w ,
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, and
generate a subtraction image by performing subtraction R W (r)−F w (g(r)) wherein r represents a voxel (x, y, z) in reference image R.
6. A computer executing a software product for bringing out a temporal difference between corresponding structures in a reference image R and a floating image F, the computer:
convolving said reference image R with a window function H w to generate R w ,
convolving said floating image F with the same window function H w to generate F w ,
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, and
generating and displaying a subtraction image on a display device of the computer by performing subtraction R W (r)−F w (g(r)) wherein r represents a voxel (x, y, z) in reference image R.
7. A computer according to claim 6 wherein said window function is an averaging function.
8. A computer according to claim 7 wherein the size of said window function is related to the dimensions of said structure.
9. A computer according to claim 6 wherein the size of said window function is related to the dimensions of said structure.
10. A product according to claim 5 wherein said window function is an averaging function.
11. A product according to claim 10 wherein the size of said window function is related to the dimensions of said structure.
12. A product according to claim 5 wherein the size of said window function is related to the dimensions of said structure.