DICOM image retrieval service
A DICOM image query service (Query / Retrieve Service) is an application class from the DICOM standard that manages instances of a data network . This service offers a function similar to the SQL language , whereby a query can be built on a small set of key values . In addition, this service supports the transfer of data from well-defined composite entities ( s. Composite Objects ).
use
The image retrieval service enables data links to be retrieved from remote application entities. This service can also cause remote application entities to transmit data pools to other remote application entities.
In action
In practice, the image query service is used as an interface to an archive or an image processing system (e.g. PACS ). In the first case, it serves as a storage space for DICOM images. It is often the case that a hospital provides a central archive for all medical images. Other subsystems and DICOM application entities (AE) can use the DICOM protocol to access this archive, e.g. B. a system can search for images or store new images. The amount of data transfers is highly dependent on the size of the establishment. High network speed is often required for a large medical facility.
Examples of archive use are manufacturer-independent archives as well as Siemens syngo.share VNA or IBM Watson Health iConnect Enterprise Archive. An example of an image processing system is a Picture Archiving and Communication System .
Information model
The information model for the SOP class is negotiated when a relationship is created. The SOP class consists of an information model and a DIMSE-C service group.
- Entity relationship models
- Key values
Entity relationship models
The models specify the hierarchy (e.g. patient level, study level, series level) and attributes on that level. The key values for each function (C-FIND, C-MOVE, C-GET) should be specified for each entity. The key values in the identification code determine which returned attributes that appear in the request match.
Definition of key values
The values are broken down as follows:
| Identifier | description |
| U | Unique key attributes |
| R. | Required key attribute |
| O | Optional key attributes |
Individual evidence
- ↑ http://dicom.nema.org/Dicom/2013/output/chtml/part04/chapter_C.html
- ↑ syngo.share VNA ( page can no longer be accessed , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ↑ IBM Watson Health iConnect Enterprise Archive
