DICOM PS3.3 2024d - Information Object Definitions |
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Table C.34.9-1 specifies the Attributes of the General Defined Acquisition Module, which describe a specification of acceptable values and ranges of acquisition parameters for an imaging procedure.
Table C.34.9-1. General Defined Acquisition Module Attributes
Specification of the acquisition parameters for acquisition protocol elements in an imaging procedure. There shall be one Item in this Sequence for each Acquisition Protocol Element in the Protocol. See Section C.34.9.1. |
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The Protocol Element Number of the Acquisition Protocol Element being specified in this Item. |
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>>Include Table 10.25-1 “Attribute Value Constraint Macro Attributes” |
For CT only Attributes defined in Table C.34.10-1 (i.e., in the Acquisition Protocol Element Sequence (0018,9920) in the Performed CT Acquisition Module) and Private Data Elements associated with this acquisition protocol element may be specified as Selector Attributes. For XA only Attributes defined in Table C.34.17-1 (i.e., in the Acquisition Protocol Element Sequence (0018,9920) in the Performed XA Acquisition Module) and Private Data Elements associated with this acquisition protocol element may be specified as Selector Attributes. The semantics of values of Constraint Violation Significance (0082,0036) in the Macro are assigned in Section C.34.9.3. The same Attribute shall not appear in more than one Item in the Sequence with the same values for Selector Sequence Pointer (0072,0052) and Selector Sequence Pointer Items (0074,1057). |
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Specifies whether this constraint may be encoded in a derived Instance with a different value. See Section C.34.9.4. Required if the constraint may not be modified, may be present otherwise. |
The Performed CT Acquisition Module in the CT Performed Procedure Protocol will generally be "fully populated". The General Defined Acquisition Module in the CT Defined Procedure Protocol Object may be "sparsely populated" (i.e., contains only the Attributes the system that is specifying the protocol "cares about").
A Protocol usually includes more than one Acquisition Protocol Element. For example, a chest Protocol in CT might include three elements in total: two localizer CT radiographs (AP and Lateral), and a single helical scan.
An illustrative example for CT is provided in Table C.34.9-2. In this example, since all parameters will be nested inside an Acquisition Protocol Element Sequence (0018,9920) and some of the parameters will be further nested inside a CT X-Ray Details Sequence (0018,9325), close attention must be paid to the use of the Selector Sequence Pointer (0072,0052) in the Attribute Value Constraint Macro.
Table C.34.9-2. Example Usage of Selector Macro Attributes for Acquisition Constraints
DICOM PS3.3 2024d - Information Object Definitions |
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