pynetdicom.pdu_items.PresentationContextItemRQ¶
-
class
pynetdicom.pdu_items.
PresentationContextItemRQ
¶ A Presentation Context (RQ) Item.
Presentation Contexts (RQ) Items are used by the association requestor to propose Abstract Syntaxes (specifications of data elements with associated semantics) and Transfer Syntaxes (sets of encoding rules).
-
abstract_syntax
¶ The Presentation Context Item’s Abstract Syntax (if available).
- Type
pydicom.uid.UID or None.
-
abstract_transfer_syntax_sub_items
¶ The Abstract/Transfer Syntax Sub-Items field value. The order of the items is not guaranteed.
- Type
list of AbstractSyntaxSubItem and TransferSyntaxSubItem
-
item_length
¶ The number of bytes from the first byte following the Item Length field to the last byte of the Item.
- Type
int
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item_type
¶ The Item Type field value (
0x20
).- Type
int
-
presentation_context_id
¶ The Presentation Context ID field value, an odd integer between 1 and 255.
- Type
int or None
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transfer_syntax
¶ The Presentation Context Item’s Transfer Syntax(es) (if available).
- Type
list of pydicom.uid.UID
Notes
A Presentation Context (RQ) Item requires the following parameters:
Item type (1, fixed value,
0x20
)Item length (1)
Presentation context ID (1)
Abstract/Transfer Syntax Sub-items (1)
Abstract Syntax Sub-item (1)
Item type (1, fixed,
0x30
)Item length (1)
Abstract syntax name (1)
Transfer Syntax Sub-items (1 or more)
Item type (1, fixed,
0x40
)Item length (1)
Transfer syntax name(s) (1 or more)
Encoding
When encoded, a Presentation Context (RQ) Item has the following structure, taken from Part 8, Table 9-13 of the DICOM Standard (offsets shown with Python indexing). Items are always encoded using Big Endian.
Offset
Length
Description
0
1
Item type
1
1
Reserved
2
2
Item length
4
1
Presentation context ID
5
1
Reserved
6
1
Reserved
7
1
Reserved
8
Variable
Abstract/transfer syntax sub-items
References
DICOM Standard, Part 8, Annex B
DICOM Standard, Part 8, Section 9.3.2.2
DICOM Standard, Part 8, Section 9.3.1
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__init__
()¶ Initialise a new Presentation Context (RQ) Item.
Methods
__init__
()Initialise a new Presentation Context (RQ) Item.
decode
(bytestream)Decode bytestream and use the result to set the field values of the PDU item.
encode
()Return the encoded PDU as bytes.
from_primitive
(primitive)Set the item’s values using a Presentation Context primitive.
Return a PresentationContext primitive from the current Item.
Attributes
Return the Abstract Syntax, if available.
Return the item’s Presentation Context ID field value as
int
.Return the item’s Item Length field value as
int
.Return the item’s Item Type field value as
int
.Return the Transfer Syntax(es).
-
property
abstract_syntax
Return the Abstract Syntax, if available.
- Returns
- Return type
pydicom.uid.UID or None
-
property
context_id
¶ Return the item’s Presentation Context ID field value as
int
.
-
from_primitive
(primitive)¶ Set the item’s values using a Presentation Context primitive.
- Parameters
primitive (presentation.PresentationContext) – The primitive to use to set the Item’s field values.
-
property
item_length
Return the item’s Item Length field value as
int
.
-
to_primitive
()¶ Return a PresentationContext primitive from the current Item.
- Returns
The primitive representation of the current Item.
- Return type
-
property
transfer_syntax
Return the Transfer Syntax(es).
- Returns
- Return type
list of pydicom.uid.UID
-