A.51.5 Segmentation Functional Groups

Table A.51-2 specifies the use of the Functional Group macros used in the Multi-frame Functional Group Module for the Segmentation IOD.

Table A.51-2SEGMENTATION FUNCTIONAL GROUP MACROS

Function Group Macro Section Usage
Pixel Measures C.7.6.16.2.1 C - Required if Derivation Image Functional Group (C.7.6.16.2.6) is not present. May be present otherwise. See A.51.5.1
Plane Position (Patient) C.7.6.16.2.3 C - Required if Derivation Image Functional Group (C.7.6.16.2.6) is not present. May be present otherwise. See A.51.5.1
Plane Orientation (Patient) C.7.6.16.2.4 C - Required if Derivation Image Functional Group (C.7.6.16.2.6) is not present. May be present otherwise. See A.51.5.1
Derivation Image C.7.6.16.2.6 C - Required if any of Pixel Measures (C.7.6.16.2.1) or Plane Position (Patient) (C.7.6.16.2.3) or Plane Orientation (Patient) (C.7.6.16.2.4) Functional Groups are not present. May be present otherwise. See A.51.5.1
Frame Content Macro C.7.6.16.2.2 M
Segmentation C.8.20.3.1 M

A.51.5.1 Segmentation Functional Groups Description

When a Frame of Reference UID is present the segment shall be specified within that coordinate system, using the Pixel Measures, Plane Position (Patient) and Plane Orientation (Patient) Functional Groups. Since this defines the spatial relationship of the segment, the size of the segmentation frames need not be the same size, or resolution, as the image data used to generate the segment data.

If the Frame of Reference UID is not present, each pixel of the segmentation shall correspond to a pixel in a referenced image, using the Derivation Image Functional Group. Hence, the rows and columns of each referenced image will match the segmentation image.

The value of Purpose of Reference Sequence (0040,A170) in the Derivation Image Functional Group Macro shall be (121322, DCM, “Source Image for Image Processing Operation”). The value of Derivation Code Sequence (0008,9215) shall be (113076, DCM, “Segmentation”).