Chapter 3 Calibration
Revision W HF Series X-ray Generators - Service Manual
3-62 Quantum Medical Imaging, LLC
AEC KV Calibration Procedure
The AEC KV Calibration screen, shown below, is used to calibrate the tube
voltage to the "base optical density" setting. There are a total of six kV
calibration points for a 125 kV system (50, 60, 80, 100, 110, and 120 kV);
150 kV systems require an additional two kV calibration points (130 and
140 kV). The image receptor and chamber field settings remain the
same as those used in the Reciprocity Calibration procedure.
Figure 3-41. AEC KV Calibration Screen
Proceed as follows:
1. Place indicated thickness of acrylic (5 CM for first calibration point) in
the X-ray beam.
2. Place a film cassette in the tray and collimate down to film size.
3. Verify the receptor in which the film cassette is inserted is selected as
indicated on the AEC KV Calibration screen.
4. Take an exposure at the setting indicated in the center display box
(i.e., 50 kVp, 200L mA).
5. Develop the film and measure the optical density using a calibrated
densitometer.
6. Press the up or down key located next to the Measured OD field
until the optical density value displayed equals the measured optical
density value (the Measured OD up arrow key increases the optical
density value and the Measured OD down arrow key decreases the
optical density value). DO NOT TAKE ANY FURTHER EXPOSURES AT
THIS SETTING.
7. Press the key next to the Measure OD field to save the first kV cali-
bration point entry (50 kV, 5 CM). The AEC KV Calibration screen is
updated for the next kV calibration point (60 kV, 10 CM).
BASE
OPTICAL
DENSITY
SETTING
MEASURED
OPTICAL
DENSITY
KEYS
KVP MEASURE
SELECT FIELD
NOTE
Calibration of the
first step (50 kVp)
is not required as
long as AEC
Optical Density
Calibration
procedure in the
previous steps
was performed
prior to AEC KV
Calibration. A
verification that
the "Measured
OD" is the same
as the "Optical
Density" setting is
all that is
required.
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