Value 1 shall identify the Pixel Data Characteristics in accordance with Section C.18.104.22.168.2 where the Enumerated Values are defined to be ORIGINAL or DERIVED.
Note: DX images may still be of type ORIGINAL rather than DERIVED despite the possibility that they may have undergone some processing. In this case a DERIVED image would have undergone yet further processing to make it substantially different from the original.
Value 2 shall identify the Patient Examination Characteristics in accordance with Section C.22.214.171.124.2 where the Enumerated Values are defined to be PRIMARY or SECONDARY.
Note: DX images generally use PRIMARY value for images captured from patient exposure.
If images from the same exposure exist with different Values of Image Type, then they shall have different SOP Instance UIDs.
Note: Source Image Sequence (0008,2112) may be used to relate these images.
Value 3 (which is specific to the IOD) shall be present and have zero length (null value).
Other Values (4 and beyond) are optional and implementation specific.