An Application Context explicitly defines the set of Application Service Elements, related options and any other information necessary for the inter-working of DICOM AEs on an Association.
The Application Context provides the highest level of negotiation, therefore, a very high level definition. Only one Application Context shall be offered per Association. DICOM specifies a single Application Context Name which defines the DICOM Application Context (applicable for this Standard and potentially later versions).
Note: For complete specification see Annex A of this Part.