DICOM PS3.4 2021b - Service Class Specifications

Y.3.3 New Instance Creation At the Frame Level (Current)
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### Y.3.3 New Instance Creation At the Frame Level

When a C-MOVE or C-GET operation is performed on a source Composite Instance at the FRAME level then the SCP shall create a new Composite Instance according to the following rules:

- The new Composite Instance shall be extracted from the source Composite Instance specified by the SOP Instance UID Unique Key present at the Composite Instance Level.

- The new Composite Instance shall be an instance of the same SOP Class as the source Composite Instance.

- The new Composite Instance shall have a new SOP Instance UID.

- The new Composite Instance shall be a valid SOP Instance.

### Note

The new Composite Instance is required to be internally consistent and valid. This may require the SCP to make consistent modification of any Attributes that reference frames or the relationship between them such as start time, time offsets, and modifying the Per-frame Functional Group Sequence (5200,9230).

- The new Composite Instance shall contain the frames from the source Composite Object as requested in the Requested Frame List. The Requested Frame List shall be interpreted according to the rules in Section Y.3.2. The frames shall be in the same order as in the source Composite Instance.

- The new Composite Instance shall include the Frame Extraction Module, which shall contain appropriate Attributes from the identifier of the C-GET or C-MOVE request that caused this instance to be created. If the Frame Extraction Module already exists in the source Composite Instance, then a new item shall be appended as an additional item into the Frame Extraction Sequence.

- The new Composite Instance shall contain the Contributing Equipment Sequence (0018,A001). If the source Composite Object contains the Contributing Equipment Sequence, then a new Item shall be appended to the copy of the sequence in the new Composite Instance, and if the source Composite Object does not contain the Contributing Equipment Sequence, then it shall be created, containing one new Item. In either case, the new Item shall describe the equipment that is extracting the frames, and the Purpose of Reference Code Sequence (0040,A170) within the Item shall be (109105, DCM, "Frame Extracting Equipment").

### Note

The existing General Equipment Module cannot be used to hold details of the creating equipment, as it is a Series level Module. The new Composite Instance is part of the same Series as the source Instance, and therefore the Series level information cannot be altered.

- The new Composite Instance shall have the same Patient, Study and Series level information as the source Instance, including Study and Series Instance UIDs.

- The new Composite Instance shall have the same values for the Attributes of the Image Pixel Module of the source Composite Instance except that the Pixel Data Provider URL (0028,7FE0) Attribute shall not be present,Pixel Data (7FE0,0010) shall be replaced by the subset of frames, as specified in section Section Y.3.3, and Number of Frames (0028,0008) shall contain the number of frames in the new Composite Instance.

- The new Composite Instance shall have the same values for other Type 1 and Type 2 Image level Attributes that are not otherwise specified. Other Attributes may be included in the new Composite Instance if consistent with the new Composite Instance.

### Note

In most cases private Attributes should not be copied unless their full significance is known. See Annex MM “Considerations For Applications Creating New Images From Multi-frame Images” in PS3.17 for more guidance.

- The new Composite Instance shall not be contained in a Concatenation. This means that it shall not contain a Concatenation UID (0020,9161) Attribute or other Concatenation Attributes. If the existing Composite Instance contains such Attributes, they shall not be included in the new Composite Instance.

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DICOM PS3.4 2021b - Service Class Specifications