DICOM PS3.17 2021e - Explanatory Information
FFF.2.4.2.2 Encoding Outline

The XA SOP Class does not encode any specific Attribute values to characterize the type of derivation.

The Enhanced XA SOP Class encodes defined terms for processing applied to the Pixel Data, and allows getting back to linear relationship between pixel values and X-Ray intensity. Viewing applications can consistently interpret the stored pixel data and enable/disable applications like edge detection algorithms, subtraction, filtering, etc.

DICOM PS3.17 2021e - Explanatory Information