Detailed View On:
•
A blue Graphic Rx hexagon, or series of hexagons, indicates the image regions that have
optimal temporal resolution.
•
Other regions shown in green, indicate image regions that have reduced temporal
resolution, thus these regions are more susceptible to motion artifacts.
Handles are available near the top and bottom of the blue Graphic Rx region. Adjust the location
of these handles to indicate the locations where you require full field of view images. The
system then determines the smallest available scan range that will cover this request, which will
be reflected by the position of the blue region.
Additionally, the user can enter a numerical value for the S/I location in the start or end scan
field. The value that you enter is where you require a full field of view image. The system will
compute and display the location where it will generate the first and last images.
3.4.2 Scan Overlap
The system applies a small amount of overlap when scanning neighboring regions. The amount
of overlap is controllable from the
Coverage Speed
collection.
•
Minimum
will generate images with some susceptibility to motion artifacts in the outer region
of axial slices near the table position boundary. This is the pre-populated setting in the GE
Reference protocols.
•
More overlap
will generate images with optimal temporal resolution, and hence, minimal
susceptibility to motion artifacts throughout the axial slices near the table position boundary.
The increased overlap results in a higher dose scan than
Minimum
.
3.4.3 Single Table Position
When the
Single Table Position
setting (see
Coverage Speed
) is set to
One
, the system
constrains the scan range to the maximum detector coverage. Set this option to
One or More
to
enable longer scan ranges.
3.5 Set the ECG and Gating settings
The
ECG and Gating
settings control the timing for when the scan data will be acquired.
When you select
ECG and Gating
from the
Scan Settings
window, the window displayed will
depend on the scan type selected.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 13 Cardiac 347
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