C.2 Clinical Context
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## C.2 Clinical Context

These classes of Application Profiles facilitate the interchange of ultrasound data on media. Typical interchanges would be between ultrasound systems, between an ultrasound system and a display workstation, between display workstations, or between an ultrasound system and a data archive. This context is shown in Figure C.2-1.

Figure C.2-1. Clinical Context

The operational use of the media transfer is potentially both intra-institutional and inter-institutional.

### C.2.1 Roles

#### C.2.1.1 File Set Creator

The role of File Set Creator shall be used by Application Entities that generate a File Set under the STD-US class of Application Profiles. Typical entities using this role would include ultrasound imaging equipment, workstations, and archive systems that generate a patient record for transfer. File Set Creators shall be able to generate the DICOMDIR directory file, single and/or multi frame Ultrasound Information Object files, and depending on the subclass, region specific calibration in the defined Transfer Syntaxes.

An FSC shall offer the ability to either finalize the disc at the completion of the most recent write session (no additional information can be subsequently added to the disc) or to allow multi-session (additional information may be subsequently added to the disc) or to allow packet-writing, if supported by the media and file system specified in the profile.

#### C.2.1.2 File Set Reader

The role of File Set Reader shall be used by Application Entities that receive a transferred File Set. Typical entities using this role would include ultrasound systems, display workstations, and archive systems that receive a patient record from a piece of media. File Set Readers shall be able to read the DICOMDIR directory file and all Information Objects defined for the specific Application Profiles, using the defined Transfer Syntaxes.

#### C.2.1.3 File Set Updater

The role of File Set Updater shall be used by Application Entities that receive a transferred File Set and updates it by the addition or deletion of objects to the media. Typical entities using this role would include ultrasound systems adding new patient records to the media and workstations that may add an information object containing a processed or modified image.

An FSU shall offer the ability to either finalize the disc at the completion of the most recent write session (no additional information can be subsequently added to the disc) or to allow multi-session (additional information may be subsequently added to the disc) or to allow packet-writing, if supported by the media and file system specified in the profile.

The FSU role is not defined for the STD-US-xx-xx-DVD profiles (i.e., for DVD media that is not DVD-RAM).

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