C.3.4 Additional Query/Retrieve Attributes
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### C.3.4 Additional Query/Retrieve Attributes

Some optional Attributes that may be used in Query/Retrieve Information Models that are not Attributes of an Information Object Definition and, therefore, are not defined in PS3.3. These Attributes are defined in Table C.3-1.

Table C.3-1. Additional Query/Retrieve Attributes

Attribute Name | Tag | Attribute Description
--- | --- | ---
Number of Patient Related Studies | (0020,1200) | The number of studies that match the Patient level Query/Retrieve search criteria
Number of Patient Related Series | (0020,1202) | The number of series that match the Patient level Query/Retrieve search criteria
Number of Patient Related Instances | (0020,1204) | The number of Composite Object Instances that match the Patient level Query/Retrieve search criteria
Number of Study Related Series | (0020,1206) | The number of series that match the Study level Query/Retrieve search criteria
Number of Series Related Instances | (0020,1209) | The number of Composite Object Instances in a Series that match the Series level Query/Retrieve search criteria
Number of Study Related Instances | (0020,1208) | The number of Composite Object Instances that match the Study level Query/Retrieve search criteria
Modalities in Study | (0008,0061) | All of the distinct values used for Modality (0008,0060) in the Series of the Study.
SOP Classes in Study | (0008,0062) | The SOP Classes contained in the Study.
Alternate Representation Sequence | (0008,3001) | A Sequence of Items, each identifying an alternate encoding of an image that matches the Instance level Query/Retrieve search criteria (see Section C.6.1.1.5.1)

If the SCP manages images in multiple alternate encodings, only one of the alternate encodings of an image is included in the number of object instances.

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