It would be helpful if search queries allowed for selecting subsets of data based on certain (ideally, unrestricted) criteria as defined by the DICOM attributes. Few examples:
* find all datasets that have more than 1 timepoint for a given patient
* find all MRIs of liver that have segmentations and dynamic contrast series (assuming segmentations are stored as DICOM SEG)
* find all MRIs of prostate that have segmentation of the gland, and the gland is larger than 100cc (assuming there is a DICOM SR object with the prostate gland volume measurement based on the associated segmentation)