GE Brivo OEC 715, Service Manual

Page: 214 / 551

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