GE Revolution CT - Page 657

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 657