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. 2021 Oct 21;12:150. doi: 10.1186/s13244-021-01099-y

Fig. 1.

Fig. 1

Validation overview with the development datasets and each of the validations described. Single–single validation = single-center, single-vendor model validated on single-center, single-vendor data. Multi–multi-validation = multi-center, multi-vendor model validated on multi-center, multi-vendor data. In the multi–single and single–multi-combinations, the first word refers to the model, while the second refers to the dataset