•
Coordinates transition from R to L, A to P, and S to I, to show relationships between current
location, landmark location, and isocenter.
Illustration 7: RAS Coordinates Schematic
Table 6:
Right:
Coordinate location falls to the patient's right of the mid-sagittal plane (right of
isocenter)
Left: Coordinate location falls to the patient's left of the mid-sagittal plane (left of
isocenter)
Anterior Coordinate location falls above the mid-coronal plane (above isocenter)
Posterior: Coordinate location falls below the mid-coronal plane (below isocenter)
Inferior: Scan location falls between the selected landmark and patient's feet
Superior: Scan location falls between the selected landmark and patient's head
The DFOV and matrix determine pixel size.
A reconstructed pixel size is determined by dividing the Display FOV (in mm) by the
reconstruction matrix size. You may magnify pixels up to eight times the reconstructed size, or
minify them to one half size. The anatomic area represented by each monitor pixel decreases
as the magnification factor increases; anatomic area/monitor pixel increases as the
magnification factor decreases.
Table 7:
Pixel Size in millimeters
DFOV in cm 512 x 512
5 0.10
10 0.20
15 0.29
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
656 6 Image Display
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