Human body is full of spatial fractals and temporal bifurcations. During treatment in medicine ( ultrasound, X-rays, photons, neutrons, ions...) in computerized tomography ( CT) is used nonlinear or locally linear ( linearized) theory ? It is on-line or off-line in different cases?
Danilo Rastovic,
Computerized Tomography (CT) uses algebraic reconstruction technique (ART) which can be considered as an iterative solver of a system of linear equations:
https://en.wikipedia.org/wiki/Algebraic_reconstruction_technique
However, there exists nonlinear iterative algorithms for CT such as multiplicative algebraic reconstruction technique (MART) and experiments have shown that it can indeed further optimize CT algorithms resulting in greater image quality and dose reduction:
Article Experiments with the nonlinear and chaotic behaviour of the ...
To answer your second question, it can be online, offline or even hybrid depending on the case.
Hope that helps.
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