optimum strategy is to find the highest Noise Index sufficient for the clinical task and
let SmartmA select the mA without using significant constraints. Use a slightly lower
Noise Index for small patients and a slightly higher Noise Index for large patients.
■
Enter
Min mA
and
Max mA
values, which constrain the mA range used during the
scan.
○
For cardiac scans, see guidelines for
AEC with Cardiac Modes
.
3. Click [Apply].
4. Review: For SmartmA and ODM scans, review if the scan is meeting the prescribed Noise
Index from the
Image Quality
widget to view the calculated X and Y, or A, P, R and L values.
If not, click [Adjust] to be presented with a list of solutions with dose changes to realize the
noise versus dose in the prescribed Noise Index.
○
This can only be done during scan set up and not in
Protocol Management
.
○
The system will display an indication when one or more rotations are at the Min mA or
Max mA value specified for SmartmA. If the system indicates this condition, check the
scan parameters in the
mA Table
to ensure the acquisition will provide the expected
results.
4.5.3.2 Set the kV
Manual kV
Use this procedure to manually prescribe the kV.
1. From the
Scan Settings
window, click
kV and mA Control
.
2. Click
kV Mode
and select
Manual kV
.
3.
Select a
kV
value. Typical applications are listed below.
○
Click
70
kV for pediatric imaging.
○
Click
80
kV for Bone Mineral Densitomery and Perfusion imaging in the brain and
pediatric imaging.
○
Click
100
kV for pediatric and small patient imaging.
○
Click
120
kV for routine imaging of the chest, abdomen, and pelvis areas.
○
Click
140
kV for imaging the posterior fossa, thick areas, and heavy patients.
4.
Click [Apply].
kV Assist
Use this procedure to prescribe a scan with kV Assist.
See the
Protocols
chapter for information about kV Assist.
1. Select a protocol and verify the Manual kV, mA Mode/SmartmA (Noise Index minimum/
maximum mA) or Manual mA, Slice Thickness, Rotation Time, Pitch, SFOV, and WW/WL
values are acceptable.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
282 4 Scan Parameters
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