Vatech A9 (PHT-30CSS)
Technical manual
VDH-TeM-098
55 / 214
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.
ALL RIGHTS RESERVED
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.
