Rotation Time; Coverage Speed Collection - GE Revolution CT User Manual

algorithms can be used; however, they will not improve resolution in the image. The HD
reconstruction algorithms can enhance the inherent resolution in Hi Res Mode acquisitions for
DFOV less than 25 cm. The Hi-Res Mode algorithms have a two appended or HD prefixes
added to the algorithm name. Hi Res Mode may be useful when a large DFOV is used and
targeting to a smaller DFOV is desired.
NOTE: Hi Res Mode is available for the following scan types and detector coverages.
•
Axial – 40, 80, 120, 140, 160 mm detector coverage
•
Helical
○
0.516:1 pitch 40 mm detector coverage
○ 0.984:1 pitch 40 mm detector coverage
○
0.992:1 pitch 80 mm detector coverage
•
Cardiac Axial – 40, 80, 120, 140, 160 mm detector coverage
Hi Res images are annotated with HR in the lower-left annotation area of the image.

4.1.6 Rotation Time

Rotation time is a parameter that can be adjusted for patient size and applications.
For scanning an average sized patient for an abdominal study, the 0.5 second rotation time may
provide adequate mAs for image quality. For scanning a larger patient, you may need to use the
1.0 second rotation time. Both studies would be completed using sub-second rotation times
because of the flexibility in having various rotation times.
• Axial – 0.28 s, 0.35 s, 0.5 s, 1.0 s
•
Cine – 0.28 s, 0.35 s, 0.5 s, 1.0 s
•
Helical – 0.28 s, 0.35 s, 0.5 s, 1.0 s
• Cardiac Axial – 0.28 s, 0.35 s

4.2 Coverage Speed collection

Scan Settings window, click Coverage Speed to open the Coverage Speed collection.
From the
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Revolution CT User Manual
Direction 5480385-1EN, Revision 1
4 Scan Parameters