Basically, CT is the principle in which a series of
1D projections is reconstructed into a 2D image
and these can then be amalgamated into a 3D
image. A projection is the radiation detected as
an emitter-detector pair pass on either side of a
sample (see figure 1).
Backprojection is the method of image reconstruction
used in this project. The reconstruction
worked by applying the equation below repeatedly.
In the equation, x and y are the co-ordinates
a pixel in the matrix, s is the sample number, θ
is the angle of sampling (projection angle) and
D is the distance the ray described by (θ,s) pass
by (x,y):