Hi Karel,
All of the acquisition times in the Dicom files seem to be the same, so that is not a great sorting technique here. To evaluate the sorting, use something like "-save_details DET", which will save a few DET* text files, showing what is influencing the sorting.
These files, as I see is noted in the Dimon help output, seem to be sorted (according to the common REL Instance Number) in slice-major order, meaning all images for slice 0 come first, then all for slice 1, and continued over time. So a better way to go might be use use that natural ordering, and add the -order_as_zt option.
For example, this seems to work with your data:
Dimon -infile_pattern 'data/IM_*' \
-gert_create_dataset -use_last_elem -dicom_org \
-order_as_zt save_det DET
Unless specified, -dicom_org uses the REL instance number for sorting (see the "RIN" column of the DET files), which works here, after flipping the time and z positions with -order_as_zt.
Give that a try and see how it goes.
- rick
