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The main purpose of Replace Images is to switch processing to a new data set, while the results generated so far (transformation, VOIs) are still available.
The main replacement mechanism is via image association.
As an example, consider that a PET and an MR are associated, and processing is started with loading the MR for generating VOIs. Replace Images swaps the role: The PET images are loaded, and from then on the (original) MR images are considered as the associated images.