indeed, apart from the different encoding of the request, packaging of the response and protocol used, the services are sufficiently similar that a dicomweb™ proxy to a conventional implementation of dicom® dimse services can be implemented (this is by design). the conventional dimse dicom® services do actually have capabilities that correspond to the instance and frame level (instance and frame level retrieve) and separate meta data retrieval capabilities (composite instance retrieve without bulk data) of dicomweb™, though these are not nearly as widely implemented as the traditional study-root study, series and image retrieval services.