Introduction of Computed Tomography

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Presentation transcript:

Introduction of Computed Tomography James Chang

History of CT Radon-Nikodym theory of Johann.Radon G.N.Huunsfeild invented CT in 1972 Nobel Prize in Physiology or Medicine 1979

The generation of CT Translate-Rotate 1st : pencil beam X-ray and single detector 2st:pencil beam X-ray and mutidector (30) Rotate-Rotate 3st:fan beam X-ray and mutidector (300-800) Stationary-Rotate 4st:fan beam X-ray and ring detector(1000-2400) 5st electronbeam (50ms)

http://xic.cc/255-667-1.do

4th Helical CT http://www.virtualmedicalcentre.com http://www.imaginis.com/ct-scan/how-does-ct-work

CT from 1st to 4th generation Original axial CT image from the dedicated Siretom CT scanner circa 1975. This image is a coarse 128 x 128 matrix

Data Acquisition

Sinogram A visual representation of the raw data obtained in a computed axial tomography (CAT) scan. http://www.physics.ubc.ca/~mirg/home/tutorial/fbp_recon.html

Sinogram

Filtered Back Projection

Sinogram 1 2 15 3 15 1 2 15 3 15 1 2 15 1 13 3 15 1 2 15 3 15

Filtered Back Projection 1 5 2 6 10 1 2 15 3 15 1 2 15 3 7 15 8 20 3 15 1 2 15 3 15 9 13 25 10 14 30 1 2 15 3 15

Filtered Back Projection 11 15 35 16 40 1 2 15 3 15 1 2 15 3 15 Without filter Point object becomes widely spread out 1 2 15 3 15 1 2 15 3 15

Why do we Apply a Filter ? Another diagram that illustrates this concept

From Sinogram to Image Video: http://www.youtube.com/watch?v=kMMyvQF-CYQ&NR=1

Thank you