DICOM PS3.5 2020b - Data Structures and Encoding

8.2.13 Constraints For SMPTE ST 2110-20 Uncompressed Active Video For DICOM-RTV (Current)
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### 8.2.13 Constraints For SMPTE ST 2110-20 Uncompressed Active Video For DICOM-RTV

This section describes the constraints applying to pixel data carried in the DICOM-RTV Flow (separated from DICOM-RTV Metadata Flow) and fully described in [SMPTE ST 2110-20] .

The following table describes constraints on the [SMPTE ST 2110-20] Video Flow in terms of the valid values for the corresponding DICOM Attributes in the DICOM-RTV Metadata Flow:

- Samples per pixel

- Bits Allocated

- Bits Stored

- High Bit

Table 8.2.13-1. Constraints Applicable to Attributes describing Pixel Data

Samples per Pixel (0028,0002) | Bits Allocated (0028,0100) | Bits Stored (0028,0101) | High Bit (0028,0102)
--- | --- | --- | ---
3 | 8, 16, 16, 16 | 8, 10, 12, 16 | 7, 9, 11, 15

DICOM Photometric Interpretation is based on CCIR 601 (aka ITU-R BT.601), therefore some restrictions apply to the possible combination of Sampling System and Colorimetry parameters as stated by [SMPTE ST 2110-20] .

Table 8.2.13-2. List of supported SMPTE ST 2110-20 Parameter Combinations

SMPTE ST 2110-20 | DICOM Photometric Interpretation (0028,0004)
--- | ---
Sampling system | Colorimetry
RGB | BT601 | RGB
YCbCr-4:4:4 | BT601 | YBR_FULL
YCbCr-4:2:2 | BT601 | YBR_FULL_422
YCbCr-4:2:0 | BT601 | YBR_PARTIAL_420

Some other [SMPTE ST 2110-20] parameter combinations do not correspond to existing DICOM photometric interpretations, so their use is currently not permitted. Table 8.2.13-3 lists the unsupported combinations.

Table 8.2.13-3. List of unsupported SMPTE ST 2110-20 Parameter Combinations

SMPTE ST 2110-20
Sampling system | Colorimetry
--- | ---
RGB | BT2020, BT709, BT2100, ST2065-1, ST2065-3
YCbCr-4:4:4 | BT2020, BT709, BT2100
YCbCr-4:2:2 | BT2020, BT709, BT2100
YCbCr-4:2:0 | BT2020, BT709, BT2100
CLYCbCr-4:4:4 | BT2020
CLYCbCr-4:2:2 | BT2020
CLYCbCr-4:2:0 | BT2020
ICtCp-4:4:4 | BT2100
ICtCp-4:2:2 | BT2100
XYZ | XYZ
KEY |

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DICOM PS3.5 2020b - Data Structures and Encoding