DICOM PS3.3 2021d - Information Object Definitions

C.8.8.6.4 Source Pixel Planes Characteristics (Current)
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##### C.8.8.6.4 Source Pixel Planes Characteristics

The Source Pixel Planes Characteristics Sequence (3006,004A) defines a stack of Source Pixel Planes on the originating system from which the Contour data of an ROI was derived. This stack of Source Pixel Planes does not need to correspond to actual Image Storage SOP Instances.

If a receiving system also utilizes a pixel-based representation of Contours, the information in this Sequence may be utilized to define the same pixel grid as the originating system to reduce the magnitude of errors caused by different sampling rates.

If Source Pixel Planes Characteristics Sequence (3006,004A) is present for an ROI in the ROI Contour Sequence (3006,0039) the following apply:

- Contours are specified on Source Pixel Planes defined by the characteristics in the Source Pixel Planes Characteristics Sequence (3006,004A).

- A Source Pixel Plane is not required to coincide with or be parallel to an actual image plane (i.e., Contour Image Sequence (3006,0016) is not required to be present, and if it is present, the referenced images need to not correspond to the characteristics of Source Pixel Planes).

- The x, y, z triplets of Contour Data (3006,0050) shall be defined on the Source Pixel Planes defined by Source Pixel Planes Characteristics Sequence (3006,004A).

- Contour Data (3006,0050) may have a different (e.g., higher) sampling than the Pixel Spacing (0028,0030).

- Source Pixel Planes for all Contours of the ROI will be parallel (since only one Image Orientation (Patient) is specified).

- Source Pixel Planes will be equidistantly spaced (since only one Spacing Between Slices is specified).

- Contours of an ROI shall be specified on every Source Pixel Plane where the ROI is present.

- If no Contour Data is specified for a given Source Pixel Plane of an ROI, the ROI is defined to be absent on that Source Pixel Plane (i.e., a Source Pixel Plane without corresponding Contour Data defines a "gap").

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DICOM PS3.3 2021d - Information Object Definitions