DICOM PS3.3 2021e - Information Object Definitions
C.8.8.29.4 Double Exposure Field Delta

The following diagram illustrates the case where the second X aperture in a double exposure is larger than the initial aperture. In this case ΔX1 is negative and ΔX2 is positive. If a field edge is defined by a multileaf collimator, then the field delta is to be applied to the most open leaf, such that all leaves can be moved to that position.

Double Exposure Field Delta

Figure C.8.8.29-1. Double Exposure Field Delta


DICOM PS3.3 2021e - Information Object Definitions