a. Select a contrast mode.
b. Select contrast presets.
9.
Set the
Timing
parameters.
See Timing Parameters for details.
10. Set the
Gating and Trace
options.
11. Set the
Secondary Recon
options.
See Recon Parameters for details.
4.5.1 Choose the Scan Type
Use this procedure to choose a scan type to specify how the scan data is acquired.
1.
From the
Scan Settings
window, click
Scan Type
.
2. From the
Scan Type
collection, choose the desired scan type.
○
Click
Axial
for a step and shoot method.
■
Routine head studies typically use Axial scans acquired with a 1 second rotation
time.
■
Hi Res chest studies may use Axial scans acquired with a sub-millimeter (0.625 mm)
slice.
○
Click
Helical
for a continuous table movement method.
■
A wide range of exam types use Helical scans.
■
To stop a scan between multiple Helical groups, press <Stop Scan> not <Stop
Move>.
○
Click
Cine
when one location needs to be scanned over a period of time, such as for
hemangioma studies.
Full is continuous exposure that supports table movement equal to the beam collimation
or no table movement, where the scan is taken at one table position.
○
Click
Cardiac
to help freeze motion of the heart and vascular structures with a Helical-
gated or Cine-gated scan.
If the
Scan Type
is changed from another scan type, the mA value automatically updates.
Review it to be sure it is acceptable.
3. For
Hi Res Mode
, click
On
in combination with the
Axial
,
Helical
, or
Cardiac
scan type to
produce images with improved resolution in the x and y directions.
○
Hi Res Mode is supported to enable collection of more views in the x and y directions to
support increased resolution using HD algorithms or improvement in IQ as a result of
having more views, such as for off-center DFOV imaging.
○
The standard set of reconstruction algorithms are compatible with Hi Res acquisitions,
however, the inherent resolution will be reduced to match non Hi Res acquisitions.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 11 Scan 279
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