Derivation Image Sequence (0008,9124)

since multiple items are permitted in the Derivation Code Sequence (0008,9215), both the general concept (calculation of ADC) and the specific method have been listed; alternatively, just one or the other could be provided

a textual description has also be provided, which in this case provides more information than the structured content (i.e., about the b-values used)

a generic purpose of reference code has been used, since only a single code is permitted and there is no mechanism (other then creating pre-coordinated codes for every possible b-value) to convey which image (set) was acquired with which b-value; the more specific alternative of a coded concept for "source image for ADC calculation" would add no value over the concept already described in Derivation Code Sequence

the SOP Instance UID in the first and second items may be the same, but a different range of frames referenced, e.g., if all of the source frames (all of the b-values) are in the same instance, as is required by the IHE Diffusion (DIFF) profile (http://wiki.ihe.net/index.php/MR_Diffusion_Imaging); if all of the frames in a single source image are used, then only a single item is necessary and the Referenced Frame Number can be omitted.

all of the images have been listed in a single item of Derivation Image Sequence (0008,9124); alternatively, multiple items of Derivation Image Sequence (0008,9124) could be sent. one for each of the different b-values used; this would allow Derivation Description (0008,2111) to communicate which set contained which b-value, but there is no structured way to communicate such numeric parameters (other then creating pre-coordinated codes for every possible b-value)