Inverter Resonance Frequency; Maximum Tolerance Of Displayed Constants (With And Without Aec Or Aop); Measurement Conditions; Filters - GE SENOGRAPHE 800T Operator's Manual

GE Medical Systems
REV 6
2–1–8 Inverter Resonance Frequency
2–1–9 Maximum Tolerance of Displayed Constants (with and without AEC or AOP)
2–1–10 Measurement Conditions
2–2

Filters

D
140 kHz approx.
D
kV:+/– 2% + M1+M1'
D
mAs: +/– 5% +/– 1 mAs + M4 + M4'
M: accuracy of the instruments used for the test.
M1 = +/– 0.6 kV +/– 1.5%
M4 = +/– 0.1 mAs +/– 2.6%
M1' = Accuracy of the measuring device
M4' = Accuracy of the measuring device
kVp: Connect a voltage divider in series with the x-ray tube and measure the voltage
with an oscilloscope,
mAs: Use a waveform analyzer connected in series with the x-ray tube. The oscilloscope
receives a signal proportional to the high voltage applied to the tube. The mAs
values are given by:
T1
mAs +
idt
T2
Where T1 is the time at which the high voltage reaches 75% of its maximum value,
and T is the time at which the high voltage returns to 75% of the maximum value.
The filters are installed on a disk driven by a stepping motor which moves from one filter to the
other.
Two different filters are supplied:
D
Molybdenum: 0.03 mm,
D
Rhodium: 0.025 mm,
The Column electronics control the filters according to operator requirements in AEC or
MANUAL mode, or to software requirements in AOP mode.
VOLTAGE
TARGET
(kV)
Molybdenum 30
Molybdenum 30
FILTER
0.03 Mo
0.025 Rh
4–3
SENOGRAPHE 800T
om 2135575–100
Dynalizer accuracy in
cathode to ground
configuration
Dynalizer accuracy
EQUIVALENCE
(half-value layer)
0.3 mm Al minimum
0.35 mm Al minimum