DICOM PS3.17 2019a - Explanatory Information

CCCC.2 Use Cases (Current)
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## CCCC.2 Use Cases

### CCCC.2.1 Use Case 1: Store and Extract Specific Measurement

The user wishes to perform measurements on the Ultrasound System, store them to the PACS and later have a specific measurement (say ABC) automatically displayed in the overlay or automatically inserted into a report page on the review system. This does not require the receiver to understand any of the semantics of the measurement.

#### CCCC.2.1.1 Configuration

The Ultrasound System is configured to encode a particular measurement using a specific pre-coordinated code (and code meaning).

In the case of measurements from the Core Set, it is a well-known pre-coordinated code (i.e., the code is in CID 12300 “Core Echo Measurements”), the full semantics are well-known and the measurement will be recorded in TID 5301 “Pre-coordinated Echo Measurement” . Likely most, if not all, of the Core Set measurements come pre-configured on the Ultrasound System.

In the case of vendor-specific or site-specific measurements, it is a pre-coordinated code managed by the site or the vendor which is entered and persisted on the Ultrasound System. Since the code is not well-known, the measurement will be recorded in TID 5302 “Post-coordinated Echo Measurement” along with the modifiers describing its semantics.

The receiver (i.e., the PACS display package or the reporting package) is configured to associate the specific pre-coordinated code with a location on the overlay or a slot in the report.

The form of the user interface for these capabilities is up to the implementer.

#### CCCC.2.1.2 Operation

The user takes measurements on the Ultrasound System, including measurement ABC. All these measurements are recorded in the Simplified Adult Echo SR object. If multiple instances of measurement ABC are included, one of them may be flagged by the Ultrasound System by setting the Selection Status for that instance to the reason it was selected as the preferred value.

The Ultrasound System stores the SR object to the PACS.

The PACS or the reporting package retrieves the SR object and scans the contents looking for measurements with the pre-coordinated code for measurement ABC. If multiple instances are found, the receiver takes the one for which the Selection Status has been set.

The receiver renders the measurement value to the display or report, annotating it with the recorded Units, Code Meaning, and/or Short Label as appropriate.

Note that in this use case the receiver handles the measurement in a mechanical way. As long as the measurement can be unambiguously identified, the semantics do not need to be understood by the receiver.

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DICOM PS3.17 2019a - Explanatory Information