8 X-ray Tube and Generator
8.1 X-ray tube
•
The Performix
™
HDw X-ray tube assembly provides mA capabilities for the small and large
focal spots.
•
The tube supports normal and Hi Resolution imaging modes.
•
80 kW peak power (large spot, 0.3 second exposure, 120 kV and 140kV, Non-Hi-Res Mode)
•
49 kW peak power (small spot, 0.3 second exposure, 100 kV, 120 kV and 140 kV, Non-Hi-
Res Mode)
8.2 Generator Serial Load Rating
(Reference IEC 60613:1989/2010, 21CFR 1020.30, 21CFR 1020.30 (h)(2)(iii) and 21CFR
1020.30 (h)(3)(v))
The serial load ratings shown in Table 15, Table 16 and Table 17 below are applicable for a
total cycle time of 10 minutes. These ratings are applicable for the nominal anode rotation
speed of 8400 RPM.
These ratings apply to a system with computer controlled technique selection, scan mode, and
scan duration.
The system uses a mathematical model to track tube temperature.
This tube cooling algorithm delays the start of a scan, if necessary, to avoid exceeding
temperatures that may damage the tube anode or unit.
Table 15: Maximum permissible mA values for serial 0.3 second exposures (10 minute cycle
time)
Serial Scan mA Ratings: 0.3s Focal Spot
Scan Mode kV Extra Large Large Small
Normal
70
375 375 250
80 580 580 580
100 720 720 485
120 735 665 405
140 630 570 345
Hi-Res
70
N/A 375 250
80 N/A 580 425
100 N/A 540 340
120 N/A 450 280
140 N/A 385 240
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
Chapter 8 Equipment 187
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