DICOM PS3.3 2019a - Information Object Definitions

C.32.3.3 Luminance Uniformity Result Macro

This Macro records the result of a Luminance Uniformity QA task for a Display Subsystem.

Table C.32.3.3-1. Luminance Uniformity Result Macro Attributes

Attribute Name



Number of Luminance Points


The number of luminance measurements recorded.

The number depends on the test pattern specified in the Measurement Pattern Code Sequence (0028,702D).


Most commonly the value is 5, which is a total of the locations on the faceplate of the Display Device (center and four corners) as defined by the TG18-UNL80 or TG18-UNL10 test pattern.

Measurement Pattern Code Sequence


Definition of the locations on the display device at which luminance measurements were taken. One measurement is recorded for each location.

>Include Table 8.8-1 “Code Sequence Macro Attributes”

BCID 8302 “Measurement Pattern Codes”.

DDL Value


The integer Digital Driving Level (DDL) at which the luminance values were measured.


Luminance Uniformity measurement uses the same DDL value for all measurements.

White Point Flag


Whether white point values were also recorded at each location.

Enumerated Values:



Luminance Response Sequence


Recorded Luminance Response Values

The number of Items shall match the value of Number of Luminance Points (0028, 701B).

The Items shall be stored in major row order (from left to right then from top to bottom).

>Luminance Value


Luminance in candelas per square meter (cd/m2) at the measurement location.


Each measured luminance includes both ambient light and light from the display device.

>CIExy White Point


White Point at the measurement location,

The white point is recorded as a CIE xy chromaticity with two dimensionless floating point values where the first is the x value and the second is the y value.

Reflected Ambient Light


Reflected ambient light in candelas per square meter (cd/m2) when the measurements were taken.

Ambient Light Value Source


Source of the ambient light value.

Enumerated Values:


a configured default value was used.


the value was measured at the time of the other measurements.


the value was provided by an external source.

DICOM PS3.3 2019a - Information Object Definitions