1.4 Film/Screen Response Vs Kvp - CPI Indico 100 Series Service And Installation Manual

CPI Canada Inc.
3D.1.4 Film/Screen Response vs kVp
Film screen response to kVp is not linear, therefore compensation must be provided in order to maintain
constant film density as kVp is changed for different anatomical studies. By selecting and calibrating various
kV breakpoints, the overall system response will be compensated such as to yield a constant film density.
Up to eight breakpoints per film screen combination are available. The eight breakpoints are spread
over three kV ranges as shown below:
•
Low kV:
•
Knee kV:
•
High kV:
Refer to figure 3D-3.
Millenia / Indico 100 Series Service Manual
50, 55, 65 kV
75 kV
85, 95, 110, 130 kV.
Figure 3D-3: kV breakpoints vs relative density
Ch # 740904-06 Rev. D
3D
AEC Calibration
Page 3D-5