C.8.15.3.5 CT Position Macro
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##### C.8.15.3.5 CT Position Macro

Table C.8-121 specifies the attributes of the CT Position Functional Group Macro.

Table C.8-121. CT Position Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
CT Position Sequence | (0018,9326) | 1 | Contains the attributes defining the CT geometry. Only a single Item shall be included in this sequence.
>Table Position | (0018,9327) | 1C | Relative longitudinal position of acquisition location of this frame in mm from an implementation specific reference point. Shall be relative to the same reference point for all frames in this SOP Instance, but may be different from the reference point in other SOP Instances. Positions as the table moves into the gantry viewed from the front are more negative. ### Note For contiguous slices reconstructed from multiple detectors one would expect different values for adjacent slices. Lateral positioning or tilting or swiveling are not described. Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.
>Data Collection Center (Patient) | (0018,9313) | 1C | The x, y, and z coordinates (in the patient coordinate system) in mm of the center of the region in which data were collected. 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.
>Reconstruction Target Center (Patient) | (0018,9318) | 1C | The x, y, and z coordinates (in the patient coordinate system) of the reconstruction center target point as used for reconstruction in mm. See Section C.8.15.3.6.1. ### Note If the reconstructed image is not magnified or panned the value corresponds with the Data Collection Center (0018,9313) attribute. Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise.

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