CT Scan Image reconstruction

COMPUTED TOMOGRAPHY IMAGE RECONSTRUCTION Presented By: Gunjan Patel (MS-Medical Software ) (B.E.-Biomedical Engg.) (PGQ-Quality Management)

History of Image Reconstruction ,[object Object],[object Object],[object Object]

CT Image Reconstruction ,[object Object],2 pixel

BACK PROJECTION METHOD ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

BACK PROJECTION METHOD ,[object Object],[object Object],[object Object]

Iterative reconstruction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example: ,[object Object],[object Object],[object Object]

Analytical methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1. Filtered back projection (-) (-) (-) (+) (+) (+) Spatial Filter

1. Filtered back projection ,[object Object],[object Object],[object Object]

1. Filtered back projection f(x,y) f(x,y) P(  t) P’(  t)

2. Fourier filtering ,[object Object],[object Object],The 1D Fourier transform of the projection of an image at an angle θ The slice of the 2D Fourier transform at the same angle

Fourier Transform to Projection

Fourier Slice Theorem Ky Kx  F(Kx,Ky) F[P(  t)] P(  t) f(x,y) t  y x X-rays

Mathematical Illustration ,[object Object],[object Object],[object Object]

From Projections to Image y x Ky Kx F -1 [F(Kx,ky)] f(x,y) P(  t) F(Kx,Ky)

Reconstruction of Object ,[object Object],[object Object],Freq. domain Interpolation IDFT Computed Object

References ,[object Object],[object Object],[object Object]

CT Scan Image reconstruction

Recommandé

Recommandé

Contenu connexe

Tendances

Tendances (20)

Similaire à CT Scan Image reconstruction

Similaire à CT Scan Image reconstruction (20)

Dernier

Dernier (20)

CT Scan Image reconstruction