Geometry for Display Attribute
| Tag | (0070,1B08) |
|---|---|
| Type | Conditionally Required (1C) |
| Keyword | GeometryForDisplay |
| Value Multiplicity | 1 |
| Value Representation | Code String (CS) |
Whether the geometry of this Series is used as the geometry for the blending operation.
See Section C.11.33.1.1.
Enumerated Values:
- TRUE
-
- FALSE
-
Only a single Item in the Sequence may have the value TRUE
Required if the geometry of this input is to be used as the geometry for the blending operation. May be present otherwise.
Section C.11.33.1.1
C.11.33.1.1 Advanced Blending Sequence
The images to be blended are specified in the Advanced Blending Sequence (0070,1B01).
Geometry refers to the following Attributes:
-
Number of Frames (0028,0008)
-
Rows (0028,0010)
-
Columns (0028,0011)
-
Pixel Aspect Ratio (0028,0034)
-
Imager Pixel Spacing (0018,1164) (if applicable)
-
Nominal Scanned Pixel Spacing (0018,2010) (if applicable)
-
Slice Thickness (0018,0050)
-
Spacing Between Slices (0018,0088)
The geometry of the output images shall match the geometry of the input specified as having the Geometry for Display (0070,1B08) as TRUE. If no input has Geometry for Display (0070,1B08) equal TRUE then the application shall choose which geometry to use.
If all inputs do not have the same frames, resolution, etc., the application determines the appropriate pixels to be blended. This implies that the blending result may vary between different applications. If consistent blending results are desired the inputs should be resampled in advance such that they have the same frames, resolution, etc.
This Module specifies no explicit relationship (such as pairing or ordering) between the sets of images and frames defined in the Sequence Attributes. This Module does not define how the images are spatially related, and what re-sampling, if any, needs to be performed before the images are blended for rendering.
It is expected that blending takes place between pixels at the same position in space.
The images in the image sets may share the same Frame of Reference, in which case the rendering application can spatially relate the image sets based on their Image Position (Patient) (0020,0032) and Image Orientation (Patient) (0020,0037) Attributes.
If a spatial registration object is included in the Advanced Blending Sequence (0070,1B01) it shall be applied to the referenced input even if the Frame of Reference is the same, as small corrections might have taken place during post-processing.
If they are both missing the application will decide how to blend the inputs.
Note
The underlying image for a superimposed segmentation image need not be the source image for the segmentation.