Monitoring convergence in 3D-VA?

Hi,

Generally when running 3D-VA I have been using the default number of iterations.

It occurs to me however that this may not be optimal in all cases.

Are there any statistics one can use to monitor convergence? And in general, does convergence take longer under certain circumstances, for example a larger or more heterogeneous dataset or smaller masked region?

Cheers
Oli

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