The WADO Retrieve transaction enables an Imaging Client to access DICOM SOP Instances with a web-based service through an HTTP/HTTPS protocol.
The Imaging Client issues an HTTP "Get To" request to request a specific DICOM instance from the CARESTREAM PACS Client. The CARESTREAM PACS Client receives the request and generates the response with the appropriate content and sends an HTTP response to the Imaging Client.
The message semantics are defined by the DICOM Web Access to DICOM Persistent Objects (WADO), PS 3.18.
The WADO Retrieve transaction is performed by the Imaging Client to send an HTTP Request-URI to the Workflow Manager. The Imaging Client generates the HTTP Request-URI to retrieve a DICOM instance. The DICOM instance is specified with its Study Instance UID, Series Instance UID and SOP Instance UID in the HTTP Request-URI. The Imaging Client must obtain the host information (e.g., web server location and script language) of the web server to perform this.
The Imaging Client can map the Retrieve AE Title of the SOP Instance to the web server host information based on its local configuration.
The IMS WADO URL: http://www.carestreamserver/um/webapp_services/wado
The IMS WADO service supports the following fields in the HTTP request:
|
Parameter Name |
Parameter Description |
|
requestType |
Type of the HTTP request performed. It must be “WADO” |
|
studyUID |
Unique identifier of the study |
|
seriesUID |
Unique identifier of the series |
|
objectUID |
Unique identifier of the object |
|
contentType |
MIME type of the response |
|
annotation |
Annotation of the object |
|
rows |
Number of pixel rows |
|
region |
Region of image |
|
windowCenter |
Window center of the image |
|
windowWidth |
Window width of the image |
|
imageQuality |
Image quality factor |
|
transferSyntax |
Transfer syntax UID used with DICOM image object returned in the response |
Example of an HTTP Request-URI for retrieving a persistent DICOM object using WADO:
http://www.carestreamserver/um/webapp_services/wado?requestType=WADO&studyUID=1.2.250.1.59.40211.12345678.678910&
seriesUID=1.2.250.1.59.40211.789001276.14556172.67789&objectUID=1.2.250.1.59.40211.2678810.87991027.899772.2&
contentType=application%2Fdicom
This example uses a response MIME type application/DICOM to request the DICOM SOP Instance returned in the native DICOM Part 10 file format.