Pixel Size in millimeters
DFOV in cm
512 x 512
20
0.39
22
0.43
25
0.49
30
0.59
35
0.68
40
0.78
45
0.88
50
0.98
The DFOV determines the anatomic area imaged by a single reconstruction.
•
Area equals pr
2
(Area = 3.14 x radius x radius)
•
The 50 cm FOV has a 25 cm radius, so its area equals 1963 cm
2
.
•
The ROI or magnification factor determines the anatomic area covered by a magnified
image.
Example: A monitor pixel represents 0.5 by 0.5 mm. Magnify pixel size by 2. Each monitor pixel
now represents 0.25 by 0.25 mm of anatomy.
Illustration 8: Pixel Size and DFOV Illustration
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 21 General Information
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