DICOM Attribute Requirement Types

Type 1: Required to be in the SOP Instance and shall have a valid value.
   
Type 2: Required to be in the SOP Instance but may contain the value of "unknown", or a zero length value.
   
Type 3: Optional. May or may not be included and could be zero length.
   
Type 1C: Conditional. If a condition is met, then it is a Type 1 (required, cannot be zero). If condition is not met, then the tag is not sent.
   
Type 2C: Conditional. If condition is met, then it is a Type 2 (required, zero length OK). If condition is not met, then the tag is not sent.




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