The data includes 2-D images, a 3-D volume in a single file, and a multi-file 3-D volume. Specify the location of a directory containing DICOM data.

I've also seen the AddFile method, but there's no hierarchy there, so I supposed that's for the series files. Create Image Datastore Containing Single and Multi-File DICOM Volumes This example shows how to create an image datastore containing volumetric DICOM data stored as a single file and as multiple files. But when it comes to building that structure (for example, to create DICOMDIR and Series files for new studies) I can't find a way to set those LowerLeverDirectoryRecords RootDirectoryRecordCollection has an Add method, but it takes a DicomItem, so I take it it's for DicomDataset or DicomTag/Value, and its property LowerLevelDirectoryRecordCollection is an IEnumerable, so no Add there. From that, I was able to understand that the DicomDirectory has a RootDirectoryRecordCollection for Patients, and from there you have LowerLevelDirectoryRecordCollection for Studies, then Series, and then Images. I've successfully read DICOMDIRs, series and even rendered images. I've been trying to find a way to use fo-dicom to create a DICOMDIR file, and have it reference several files that contain image series, but so far I can't.

Create a more detailed dicomdir file