I am developing a dicom image archiving and viewer for hospitals. Since 2 weeks have studied and learned what are they ! . Still have a question of how to query the modalities (Syntax). I have the tag sheet but heard something like matching key and response key from SCP and SCU.
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A viewer workstation doesn’t query a modality, but an image archive previously pushed by the modality. Image archive are queried by a viewer with the query/retrieve DICOM service. There may be exceptions, but modalities don’t archive the images themselves.
A modality pushes images to an archive with SCU/SCP communication, modality being the SCU, archive the SCP. Modality uses the Storage commitment service.
Also get yourself a book like Oleg S. Pianykh’s, since Internet has no really friendly DICOM learning resources.