A VNA Supports Open Standards
The communication with the VNA takes place using the DICOM storage service protocol. Searches are supported by the DICOM query retrieve service protocol. This table shows a list of required and unique attributes, or keys, defined in the DICOM standard, that have to be supported by every DICOM-compliant archive. The DICOM standard is almost exclusively used for communication between modalities and PACS, and PACS and VNA.
Many vendors have implemented Sequel database queries from their workstations to provide greater efficiency and functionality. A Sequel interface also provides administrative tools for statistic reporting and troubleshooting. Standard exchanges with information systems are DICOM and HL7-compliant to exchange patient and study updates.
- Communication with the VNA uses the DICOM Storage Services protocol
- The DICOM standard is used for communication between modalities and PACS, and PACS and VNA
- Workstation database queries are used to provide greater efficiency and functionality
- An SQL interface provides administration tools
The image manager and archive interface supports DICOM Modality Performed Procedure Step and Storage Commitment as defined by the IHE scheduled workflow profile. IHE also specifies the exchange of documents and images with external information sources using the XDS and XDS-I profiles.
Unfortunately there is no archiving standard defined to address this as the standards typically deal with the interface only. A de-facto archiving standard for image and related information is known as Part-10. This does not include the DICOMDIR structure which is meant to be used when archiving images on CD or other external media.
- The image manager and archive interface supports DICOM Modality Performed Procedure Step and Storage Commitment defined by the IHE
- Part-10 is the de-facto standard for image and related information archiving
The so-called metafile or Group 0002 attributes are important because they define the encoding of the DICOM objects as JPEG’s, MPEG’s, wavelets, etc. The Part-10 requirement preserves the DICOM object, which in most cases includes pixels and the DICOM header information.
Some formats, like PDF and MPEG, can be encapsulated as DICOM objects depending on how they are received. But, they should also be archived in their native non-DICOM format to meet the requirements of a true multimedia archive. Additional metadata might be stored in such a way as to include the image or object location, last retrieval, and whatever an archive needs to manage the object.
- Group 0002 Attributes define the encoding of DICOM objects
- Some non-DICOM formats may be encapsulated as DICOM objects
For more information about developing a Vendor Neutral Architecture, the VNA Institute of Technology, or to enroll for CPHIMS (CE) Continuing Education Hours, visit http://www.vnait.org.For information about TeraMedica, visit: http://www.teramedica.com