How to understand dimensions 1 correspond to neighbouring slices？

[yslcc]

Thank you for your shareing！
I can't understand how the first dimension correspond to the neighbouring slices. I have studied it was performed on three consecutive cross-sections. But I still don't know how to construct my own dataset in terms of dimension 1. Could you help me？ Thank you.

[wjl1999]

The adjacent slices of the same patient are stacked to form the data set, but I think this dimension of data is long and should be stacked by multiple patients, so there should be no strict adjacent information in the whole data set. btw, I would like to ask if it is possible to obtain the slice order information of the processed data set itself