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CT Scan Image reconstruction
1.
COMPUTED TOMOGRAPHY IMAGE
RECONSTRUCTION Presented By: Gunjan Patel (MS-Medical Software ) (B.E.-Biomedical Engg.) (PGQ-Quality Management)
2.
3.
4.
IMAGE RECONSTRUCTION
5.
6.
7.
Example:
8.
9.
10.
11.
12.
13.
1. Filtered
back projection (-) (-) (-) (+) (+) (+) Spatial Filter
14.
15.
1. Filtered
back projection f(x,y) f(x,y) P( t) P’( t)
16.
17.
Fourier Transform to
Projection
18.
Fourier Slice Theorem
Ky Kx F(Kx,Ky) F[P( t)] P( t) f(x,y) t y x X-rays
19.
20.
From Projections to
Image y x Ky Kx F -1 [F(Kx,ky)] f(x,y) P( t) F(Kx,Ky)
21.
22.
23.
Queries !!!
24.
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