Do I need to preprocess the BTCV dataset?

I downloaded the BTCV dataset from the link provided in the README.md. The dataset contains three folders: averaged-testing-images, averaged-training-images, and averaged-training-labels.
Inside these folders, the files are named like DET0000101_avg.nii.gz.

Do I need to perform any additional preprocessing on the dataset?
If so, what preprocessing steps are required?