the optimisation process is aimed at improving the general performance of the probe (in terms of steering, contrast etc). Hence I'd say it's for any application field, including NDT.
There is substantial literature on optimization/evaluation of medical imaging systems and methods. Here are few articles of ours that might be of interest:
Article A no-gold-standard technique for objective assessment of qua...
Article An ideal-observer framework to investigate signal detectabil...
These articles also contain references to other articles on optimization.