MI-42-0001 Rev. 19 245
CT USER INFORMATION: Dosage Factors and Image Quality
Tube Rating Charts Maximum allowed tube current (mA) as a function of the following starting heat storage and tube
voltages:
X-ray Controls and
Ge
nerators
Focal spot 1.0 x 1.0 mm
7
degrees, 3 phase, 7200 RPM
Vol.
scan
time
(sec)
Starting Heat storage =
16%
Starting Heat Storage =
33%
Starting Heat Storage =
50%
1
290 (c) 330 260 290 (c) 330 260 290 (c) 330 260
2
290 (c) 330 260 290 (c) 330 260 290 (c) 330 260
4
290 (c) 330 260 290 (c) 330 260 290 (c) 330 260
6
290 (c) 330 260 290 (c) 330 260 290 (c) 330 260
10
290 (c) 330 260 290 (c) 330 260 290 (c) 330 260
20
290 (c) 330 260 290 (c) 330 260 290 (c) 330 260
30
290 (c) 330 260 290 (c) 330 260 290 (c) 250 (a) 200 (a)
40
290 (c) 330 250 290 (c) 260 (a) 210 (a) 240 (a) 190 (a) 150 (a)
50
290 (c) 270 (a) 210 (a) 260 (c) 210 (a) 170 (a) 190 (a) 150 (a) 120 (a)
60
280 (a) 230 (a) 180 (a) 220 (a) 180 (a) 140 (a) 160 (a) 130 (a) 100 (a)
Key
(a) Limited by available heat storage
(b) Limited by window heating
(c) Limited by filament emission
Parameters Range Accuracy
Generator
Power 31.25 kW Maximum
Reproducibility
60 - 125 kVp
+/-10%
(CV) of 0.05
Linearity
25 - 125 mAs
Adjacent: (CV) of
0.05
Non-adjacent:
<
0.10
Rating and Duty Cycle 125 kV, 250 mA, 20 s
Output voltage 80 - 125kV
Output current 0 - 250 mA
Nominal electric power
(1s)
326W
Maximum average
electric power
500W
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