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.
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. |