Delimitation of the Sequence of Items

Delimitation of the last Item of a Sequence of Items, encapsulated in a Data Element of Value Representation SQ, shall be in one of the two following ways:

The encoder of a Sequence of Items may choose either one of the two ways of encoding. Both ways of encoding shall be supported by decoders of the Sequence of Items.

Note: The Sequence Delimitation Item Tag (FFFE,E0DD) is different from the Item Delimitation Tag (FFFE,E00D) in that it indicates the end of a Sequence of Items whose Length was left undefined. If an undefined length Item is the last Item of a Sequence of Items of undefined length, then an Item Delimitation Tag will be followed by a Sequence Delimitation Tag.

Note: An encapsulated Data Set does not include the Specific Character Set data element unless the Specific Character Set Attribute is defined as part of the IOD for that sequence.

If an encapsulated Data Set includes the Specific Character Set Attribute, it shall apply only to the encapsulated Data Set. If the Attribute Specific Character Set is not explicitly included in an encapsulated Data Set, then the Specific Character Set value of the encapsulating Data Set applies.

The following is an illustrative example.


Data Element


Sequence of Items


Sequence Delimitation Item




Item Delimitation Data Element

Please note the DE-SQD and DE-ID elements are added internally. You do not have to explicitly add these elements.

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