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For example, a post-processing application creating DERIVED images from ORIGINAL images would place its own identification within the General Equipment Module and identify the original acquisition equipment as an Item within the Contributing Equipment Sequence (0018,A001). Here, the value of Purpose of Reference Code Sequence (0040,A170) within the Item would be (109101, DCM, "Acquisition Equipment"). Image display applications wishing to annotate images with information related to the acquisition environment would prefer to extract such details from the Contributing Equipment Sequence rather than the General Equipment Module.

For example, an image fusion application would place its own identification within the General Equipment Module and identify each of the original acquisition equipment as separate Items within the Contributing Equipment Sequence (0018,A001). Here, the value of Purpose of Reference Code Sequence (0040,A170) within each Item would be (109101, DCM, "Acquisition Equipment").

For example, a post-processing application creating DERIVED images from other DERIVED images would place its own identification within the General Equipment Module and add the source equipment as an additional Item within the Contributing Equipment Sequence (0018,A001). Here, the value of Purpose of Reference Code Sequence (0040,A170) within the Item would be (109102, DCM, "Processing Equipment").

For example, a gateway device that coerces Attributes of existing Composite Instances (without creating new Composite Instances) would retain information about the creating equipment within the General Equipment Module and provide its own identification as an Item within the Contributing Equipment Sequence (0018,A001). Here, the value of Purpose of Reference Code Sequence (0040,A170) within the Item would be (109103, DCM, "Modifying Equipment").

For example, equipment that has been used for de-identifying could retain information about the creating equipment within the General Equipment Module and provide its own identification, and that of its operator, as an Item within Contributing Equipment Sequence (0018,A001). Here, the value of Purpose of Reference Code Sequence (0040,A170) within the Item would be (109104, DCM, "De-identifying Equipment").

In the case of processing equipment, further information about the algorithm(s) used may be found in invocations of the Table 10-19 Algorithm Identification Macro Attributes, or in SR instances, TID 4019 Algorithm Identification.