Show Grayscale Inverted Attribute
| Tag | (0072,0706) |
|---|---|
| Type | Optional (3) |
| Keyword | ShowGrayscaleInverted |
| Value Multiplicity | 1 |
| Value Representation | Code String (CS) |
Whether or not to invert the rendered luminance of the displayed values. See Section C.23.3.1.4.
Enumerated Values:
- YES
-
The maximum output value after the display pipeline has been applied shall be displayed with the minimum available luminance.
- NO
-
The maximum output value after the display pipeline has been applied shall be displayed with the maximum available luminance.
Note
-
The YES and NO values of this Attribute correspond to the Presentation LUT Shape (2050,0020) values of INVERSE and IDENTITY, as described in Section C.11.6.1.2.
-
Only applicable to display of grayscale images.
Section C.23.3.1.4
C.23.3.1.4 Presentation Intent Attributes
The Attributes that indicate the presentation intent for each Display Set of a Hanging Protocol Instance are: Display Set Patient Orientation (0072,0700), VOI Type (0072,0702), Pseudo-color Type (0072,0704), Show Grayscale Inverted (0072,0706), Show Image True Size Flag (0072,0710), Show Graphic Annotation Flag (0072,0712), Show Patient Demographics Flag (0072,0714), and Show Acquisition Techniques Flag (0072,0716).
-
If one Presentation State Instance is defined for the images that are to be displayed, then it shall be applied.
-
If more than one Presentation State Instance is defined for the images that are to be displayed, then the presentation intent Attributes, if present, shall be used to select the closest matching Presentation State Instance to apply (for example, matching VOI Type (0072,0702) in the Hanging Protocol Instance with Window Center & Width Explanation in the Presentation State Instance). Otherwise, the application shall determine which Presentation State Instance to apply.
-
If no Presentation State Instance is defined for the images that are to be displayed, then the presentation intent Attributes, if present, shall be applied (for example, matching VOI Type (0072,0702) in the Hanging Protocol Instance with Window Center & Width Explanation in the Image). Otherwise, the display related information in the Image Instances shall be applied.
The intent of VOI Type (0072,0702) is to support generic intensity window settings for the Display Sets in a Hanging Protocol, such as lung, soft tissue, or bone for chest CT. It is expected for most other modalities that the window/center or VOI LUT values, if not provided in a Presentation State Instance, would be provided in the Image Instance rather than by intent in a Hanging Protocol Instance.
The value of Show Grayscale Inverted (0072,0706) shall override any such intent expressed in the images or associated Presentation States to which the Hanging Protocol is applied.
Note
-
For example, an image may have a MONOCHROME2 Photometric Interpretation (0028,0004) and no Presentation LUT Shape (2050,0020), which implies that maximum values are displayed with maximum available luminance, but the presence of a Show Grayscale Inverted (0072,0706) value of YES in the Hanging Protocol requires maximum values to be displayed with minimum available luminance.
-
For example, an image may have an applicable Presentation State with a Presentation LUT Shape (2050,0020) of IDENTITY, which implies that maximum values are displayed with maximum available luminance, but the presence of a Show Grayscale Inverted (0072,0706) value of YES in the Hanging Protocol requires maximum values to be displayed with minimum available luminance.
-
For example, an image may have an applicable Presentation State with a Presentation LUT, in which case the minimum possible LUT output value (i.e., 0) will be interpreted as maximum available luminance if the value of Show Grayscale Inverted (0072,0706) is YES.
The intent of Display Set Patient Orientation (0072,0700) is to describe the preferred image rotation and/or flip for presentation within an image box. Each of the two values shall be an anatomic direction designated by the capital letters: A (anterior), P (posterior), R (right), L (left), H (head), F (foot), or X (unspecified). Each value of the orientation Attribute shall contain at least one of these characters. If refinements in the orientation descriptions are to be specified, then they shall be designated by one or two additional letters in each value. Within each value, the letters shall be ordered with the principal orientation designated in the first character. If the value "X" is used for one of the values, the patient direction for that value is not defined.
The first value is the patient direction to be oriented at the right side of the image box for each image. The second value is the patient direction to be positioned at the bottom of the image box for each image. The application shall use the patient orientation information of each image (if available) to compute the best rotate and/or flip operation to be applied within the display set. If the patient orientation of an image is not defined, then this Attribute shall be ignored.
Section C.11.6.1.2
C.11.6.1.2 Presentation LUT Shape
A value of INVERSE shall mean the same as a value of IDENTITY, except that the minimum output value shall convey the meaning of the maximum available luminance, and the maximum value shall convey the minimum available luminance. In other words:
-
P-Value = maximum value - output value