CPI Canada Inc
Reproducibility, Linearity, & HVL Testing
X-Ray Generator Service Manual Supplement 740917-00 Rev. A
Page 3
2.0 EQUIPMENT
SETUP
1.
Place the radiation probe above the table approximately 25 cm (10”). Select an SID of
approximately 100 cm (40”).
2.
Place a lead diaphragm over the detector and adjust its height so that the X-ray beam covers the
detector but does not over radiate the sides of the ‘R’ probe. Refer to figure 1.
Figure 1: mR measurement setup
3.0 REPRODUCIBILITY
Calculate reproducibility as follows:
1.
Using kV and mA/ms or mAs values per tables 1 to 4, make a series of 5 exposures.
2.
Record each of the measured mR values in the appropriate table. Refer to step 3 before
beginning step 2.
3.
Record the preselected mAs for each series of exposures in the header of each table. For 3 point
generators, this is the calculated mAs value where mAs = mA X time in seconds (example for 160
mA and 125 ms, mAs = 160 X 0.125 = 20 mAs).