SPECIFICATIONS
GE Medical Systems
SENOGRAPHE 800T
REV 6 om 2135575–100
4–3
2–1–8 Inverter Resonance Frequency
140 kHz approx.
2–1–9 Maximum Tolerance of Displayed Constants (with and without AEC or AOP)
kV:+/– 2% + M1+M1’
mAs: +/– 5% +/– 1 mAs + M4 + M4’
M: accuracy of the instruments used for the test.
M1 = +/– 0.6 kV +/– 1.5% Dynalizer accuracy in
cathode to ground
configuration
M4 = +/– 0.1 mAs +/– 2.6% Dynalizer accuracy
M1’ = Accuracy of the measuring device
M4’ = Accuracy of the measuring device
2–1–10 Measurement Conditions
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:
mAs
T1
T2
idt
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.
2–2 Filters
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:
Molybdenum: 0.03 mm,
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.
ÁÁÁÁ
ÁÁÁÁ
TARGET
ÁÁÁÁÁ
ÁÁÁÁÁ
VOLTAGE
(kV)
ÁÁÁÁ
ÁÁÁÁ
FILTER
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
EQUIVALENCE
(half-value layer)
Molybdenum
30
0.03 Mo
0.3 mm Al minimum
Molybdenum
30
0.025 Rh
0.35 mm Al minimum
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