ADNI baseline dataset selection issue (IDA-platform)

Hi everyone,

I’m working with the ADNI dataset through the IDA platform, and I’m focusing on baseline data.

When I select the baseline timepoint, I end up with many participants who have only PET scans and no MRI. This is a problem for my analysis since I need both PET and MRI for multimodal processing.

Has anyone else faced this issue? Am I selecting the data incorrectly, or is it a known limitation in the baseline dataset?

Thanks for any insight!