Images of the Nuclear Medicine SOP class are described by the Frame Increment Pointer (0028,0009), which in turn references a number of different "Vectors" as defined in Table "NM Multi-frame Module" in PS3.3. Like the Functional Groups above, these Vectors are required to contain one value for each frame in the Image, and so their contents must be modified to match the list of frames extracted, ensuring that the values retained are those corresponding to the extracted frames.