DICOM Attribute Requirement Types
| Type 1: |
Required to be in the SOP Instance and shall have a valid value. |
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| Type 2: |
Required to be in the SOP Instance but may contain the value of "unknown", or a zero length value. |
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| Type 3: |
Optional. May or may not be included and could be zero length. |
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| 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. |
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| 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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