Pixel in center of matrix = (255,255);
Pixel ten columns to the right = (10,0)
Illustration 6: RAS Coordinates Schematic
NOTE: The illustration above represents a 512 x 512 matrix viewport.
•
RAS: Anatomic distance from the center of the landmark slice
Target the image; decrease the DFOV diameter. Center the reconstruction on coordinates other
than the SFOV center.
Magnifying and targeting can displace the central SFOV pixel from the central monitor pixel.
Look at the DFOV coordinates and magnification annotation to find the SFOV center, or display
the grid. The grid always appears over the pixel in the center of the DFOV Matrix (coordinate
255,255).
6.4 RAS Coordinates
These three distances in millimeters appear on the upper left of the viewport on which the
mouse cursor is on, when Continuous Report Cursor is selected.
•
The pixel with the R/L and A/P coordinates closest to zero, represents the SFOV center. The
S/I coordinate always equals the table location at isocenter.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 21 General Information 655
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