Table C.8-122 specifies the attributes of the CT Geometry Functional Group Macro.
Table C.8-122. CT Geometry Macro Attributes
|
Attribute Name |
Tag |
Type |
Attribute Description |
|---|---|---|---|
|
CT Geometry Sequence |
(0018,9312) |
1 |
Contains the attributes defining the CT geometry. Only a single Item shall be included in this sequence. |
|
>Distance Source to Detector |
(0018,1110) |
1C |
Distance in mm from source to detector center. See Section C.8.15.3.6.1. NoteThis value is traditionally referred to as Source Image Receptor Distance (SID). Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise. |
|
>Distance Source to Data Collection Center |
(0018,9335) |
1C |
Distance in mm from source to data collection center. See Section C.8.15.3.6.1. Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise. |
In Figure C.8-19 the relationship of the Geometric Attributes within the CT Geometry and CT Reconstruction functional groups is shown. Figure C.8-19, viewed from the front of the gantry (where the table enters the gantry), is informative only and is not meant to represent a standardization of an equipment-based frame of reference.
