Table C.8.22-14 specifies the Attributes of the PET Position Macro.
Table C.8.22-14. PET Position Macro Attributes
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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. NoteRequired if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL. May be present otherwise. |
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The x, y, and z coordinates (in the Patient-Based Coordinate System) in mm of the center of the region in which data were collected. See Section C.8.22.5.4.1. Required if Frame Type (0008,9007) Value 1 equals ORIGINAL. May be present otherwise. |
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The x, y, and z coordinates (in the Patient-Based Coordinate System) of the reconstruction center target point as used for reconstruction in mm. See Section C.8.22.5.4.1. NoteIf 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 equals ORIGINAL. May be present otherwise. |
In Figure C.8.22-1 the relationship of the Geometric Attributes within the PET Geometry and PET Reconstruction Functional Groups is shown. In this example, the Pixel Data is shown encoding the entire reconstructed region with no outside padding or clipping, and the reconstructed region is illustrated as being square, i.e., the value of Reconstruction Diameter would be the same as both values of Reconstruction Field of View, whichever Attribute is present. Figure C.8.22-1, 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.
