GE Brivo OEC 715 - Kv Measurement and Adjustment; Kv Measurement and Accuracy Check

Calibration
4-3
4.2. kV Measurement and Adjustment
4.2.1. kV Measurement and Accuracy Check
The X-ray generator is composed of high voltage transformer, high voltage rectifier and X-ray tube in one
pressurized oil tank. kV value can be measured by kV meter. Position the kV meter in the center of the X-
ray beam 30 cm above the focal spot.
KV Accurancy requirement
Take exposure at kV values below in manual normal Fluoro mode. The error should be within ±7%
ranges. Otherwise, perform the kV adjustment procedure in section 4.2.2 until all the kV values meet the
requirement below.
Exposure
mode
kVp
value
mA or mAs Set Value
Calculation
Error
Minimum
(kVp)
Maximum
(kVp)
Low Dose
99 kVp
2mA
7%
92.07
105.93
Normal
Fluoro
66kVp
4mA
7%
61.38
70.6
110 kVp
1mA
7%
102.3
117.7
High Level
Fluoro
55 KVp
4mA
7%
51.15
58.85
110 kVp
4mA
7%
102.3
117.7
Digital Spot
55 KVp
4mA
7%
51.15
57.75
80 kVp
4mA
7%
74.4
85.6
110 kVp
4mA
7%
102.3
117.7
Radiography
55 kVp
40mAs (For 100/110V/120V input)
80mAs (For
200V/220V/230V/240V input)
7%
51.15
58.85
80KVp
40mAs
7%
74.4
85.6
110 kVp
20mAs
7%
102.3
117.7
KV Accurancy requirement in Australia
Take exposure at kVp values below in normal fluoro mode. The error should be within ±5% ranges.
Otherwise, perform the kVp adjustment procedure in Section 4.2.2 until all the kVp values meet the
requirements below.
Exposure
mode
kVp
value
mA or mAs Set Value
Calculation
Error
Minimum
(kVp)
Maximum
(kVp)
Low Dose
99 kVp
2mA
5%
94.05
103.95
Normal
Fluoro
66kVp
4mA
5%
62.7
69.3
110 kVp
1mA
5%
104.5
115.5