What is Physical Principle for CT ?

[Dr.Wasim]

Hello

How are u ?

please help me

What is Physical Principle for CT ( Computed Tomography ) ?

 

[mgb_phys]

It's just a series of 1d x-rays
You shoot an x-ray through the victim at a range of angles
You then divide the body into a series of boxes (in a computer) and work out what density you would out in each box so that a ray through a line of boxes gives the same total absorption as you measured with the x-ray along that same line

The details of how you do the sums depends on the system, but it's basically just a matrix inversion

 

[berkeman]

Good summary by mgb. For lots more reading:

http://en.wikipedia.org/wiki/X-ray_computed_tomography

(but keep in mind that some of that article may be controversial -- I think mainly in the safety area, but maybe in other areas too).