Vatech A9 (PHT-30CSS)
Technical manual
VDH-TeM-098
55 / 214
COPYRIGHT© 2020 VATECH.
3. CT Sensor Calibration
To optimize CT image quality in the equipment, the operator should perform the Sensor Calibration
operation according to the following procedures.
Regular Sensor Calibration check-up is recommended to perform for image optimization against
temperature and humidity variation.
3.1. CT Sensor Calibration Standard
• CT Sensor Dark Calibration Standard Value
As a dark acquisition step, check the operation of the sensor and the dark level through the
acquired dark.
Min Max
Median value 700 2300
• CT Sensor Bright Calibration Standard Value
※ Using filter by each calibration point
Acquisition conditions
Half Scan
4 point 2 point
Filter
1 axis filter Al Al
Additional filter(Cu 1 mm) O X
The standard of the level value for each bright calibration point is as follows.
※ Bright standard value: 4 points with Cu 1 mm filter
Bright Min Max
Median value
Cal Point 1 80 120
Cal Point 2 150 700
Cal Point 3 800 1800
Cal Point 4 2000 2500
※ Bright standard value: Additional 2 points
Bright Min Max
Median value
Cal Point 1 4500 5500
Cal Point 2 9500 10500
• From the achieved CT Sensor Bright Calibration data file, the 1,2
Point Bright data and the 1,4 Point Bright data file should meet the
standard value. Other results from different points Bright Datafile can
be varied by characteristics of each sensor.
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