DICOM PS3.8 2019c - Network Communication Support for Message Exchange

9.3.3.3 User Information Item Structure

The User Information Item shall be made of a sequence of mandatory length fields followed by a variable field. Table 9-20 shows the sequence of the mandatory fields.

The variable field shall consist of one or more User-Data Sub-Items.

Note

The User-Data Sub-Items may be present in any order within the User-Information Item. No significance should be placed on the order of User-Data Sub-Items within the User Information Item. Sending applications should be aware that some older applications might expect Sub-Items to be encoded in ascending order of Item-type within the enclosing Item.

Table 9-20. User Information Item Fields

Item bytes

Field name

Description of field

1

Item-type

50H

2

Reserved

This reserved field shall be sent with a value 00H but not tested to this value when received.

3-4

Item-length

This Item-length shall be the number of bytes from the first byte of the following field to the last byte of the User-data-information field(s). It shall be encoded as an unsigned binary number.

5-xxx

User-data

This variable field shall contain User-data sub-items as defined by the DICOM Application Entity. The structure and content of these sub-items is defined in Annex D.


DICOM PS3.8 2019c - Network Communication Support for Message Exchange