Kv Assist Kv Mode; Ma Mode - GE Revolution CT User Manual

4.3.1.2 kV Assist kV Mode

kV Assist Mode is selected, the system will adjust kV and NI / minimum and maximum
When
mA based on the patient attenuation from the scout, and the protocol's clinical task, baseline kV,
kV range, mA mode, and mA setting or mA range and Noise Index.
Protocol chapter for additional details on setting up kV Assist in protocols.
See the

4.3.2 mA Mode

kV and mA Control collection, select mA Mode .
From the
The mA value determines the focal spot size that can be used to limit the system to a small
focal spot. You need to enter the correct mA value for the focal spot you wish to use based on
Table 17 and Table
scans is 140 mA. The system maximum for scout scans is 250 mA. The system maximum for
pediatric scans is kV dependent based on a limit of 42 kW. For Helical scans, the mA may be
further constrained by the duration of the scan.
Table 17: Maximum permissible mA values for single 0.3 second exposure
Table 18: Maximum permissible mA values for single 4 second exposure
Chapter 11 Scan
18. The system minimum is 10 mA. The system maximum for SmartPrep
Single Scan mA Ratings: 0.3s
Scan Mode kV
70
80
Normal 100
120
140
70
80
Hi-Res 100
120
140
Single Scan mA Ratings: 4s
Scan Mode kV
70
80
Normal 100
120
140
70
80
Hi-Res
100
120
Direction 5480385-1EN, Revision 1
Focal Spot
Extra Large Large
375 375
580 580
720 720
740 665
635 570
N/A 375
N/A 580
N/A 545
N/A 455
N/A 390
Focal Spot
Extra Large Large
375 375
580 580
720 660
605 550
520 470
N/A 375
N/A 580
N/A 475
N/A 395
Revolution CT User Manual
Small
250
580
490
405
350
250
425
340
280
240
Small
250
550
440
365
310
250
385
310
255
271