SIRT 3D (ToMoBAR)

Description

Simultaneous Iterative Reconstruction Technique (SIRT) is a widely used iterative algorithm for image reconstruction. It updates the system of linear algebraic equations simultaneously using averages and therefore faster than Algebraic Reconstruction Technique. However, it is still slow in convergence and requires hundreds of iterations normally.

Where and how to use it:

When the data is noisy, incomplete, or limited-angle data. Normally direct methods do not work well with that kind of data so it is recommended to use iterative methods.

What are the adjustable parameters:

• The number of iterations is the most important parameter for the method as it requires at least 500 iterations. One can try a faster CGLS 3D (ToMoBAR) method.

Fig. 45 Reconstruction using SIRT with iterations=100.

Fig. 46 Reconstruction using SIRT with iterations=500.