Manual Ma Mode; Smartma Mode - GE Revolution CT User Manual

4.3.2.1 Manual mA Mode

You can enter a mA value for each prescribed scan group in Manual mA mode. You need to
enter the correct mA value for the focal spot you wish to use based on
When building protocols, make sure the Manual mA value field is populated with a reasonable
mA value, even if the protocol will use SmartmA or SmartmA ODM, in case SmartmA or
SmartmA ODM is turned off when in Manual mA Mode.

4.3.2.2 SmartmA Mode

When SmartmA Mode is selected, the mA on the
minimum and maximum mA range to be considered for the scan group. SmartmA or SmartmA
ODM will determine the actual mA range based on the patient size and attenuation.
Images reconstructed from a SmartmA enabled scan are annotated with a tilde symbol (~) next
to the Noise Index, as shown in
NOTE: SmartmA is disabled if the patient orientation does not match the scout orientation.
The system will inform and instruct you that Patient Orientation or Patient Position has
changed from the previous series, and that AEC features have been disabled. You
can choose to reacquire a new scout image to reorient the patient to be consistent
with the orientation of the previous scout or change to Manual mA Mode.
The following message will be displayed if SmartmA is unavailable due to patient orientation or
position mismatch:
NOTICE
SmartmA, ODM and kV Assist unavailable due to patient orientation/position mismatch. Scan a
scout with the same patient orientation/position or Manual mA and kV must be set.
When possible, the kV setting for the scout should be taken using the same kV used for the
Axial or Helical scan.
The system uses the patient attenuation data collected from the most recent scout scanned for
the exam, the patient habitus, the prescribed , and other settings in the mA table to determine
the mA to be used for the acquisition. You can view the predicted mA values for each rotation of
272
Single Scan mA Ratings: 4s
Scan Mode kV
140
Illustration
Illustration 17: Image Annotation
Direction 5480385-1EN, Revision 1
Focal Spot
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N/A 340
Scan Settings window is annotated with the
17.
Revolution CT User Manual
Small
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Table 17 and Table 18.
4 Scan Parameters