CPI Indico 100 Series Service And Installation Manual page 222

Reproducibility, Linearity, & HVL Testing
3.0 REPRODUCIBILITY (Cont)
3 point = 80% of maximum kV, 250 ms, mA to give 100 - 500 µR (1 - 5 µGy) dose.
2 point = 80% of maximum kV, mAs to give 100 - 500 µR (1 - 5 µGy) dose.
EXP No.
1
2
3
4
5
Calculate standard deviation (S) using formula at beginning of this section:
Calculate reproducibility =
EXAMPLE
EXP No.
1
2
3
4
5
Calculate standard deviation (s) using formula at beginning of this section:
Calculate reproducibility =
Page 6
DOSE (mR)
Calculate each of the differences
ie: DIFF
mR =
1
Repeat for each remaining mR
________
value.
S = _________ (not to exceed 0.045)
mR
Table 4: Reproducibility
DOSE (mR)
249.0
245.0
244.0
242.0
243.0
Calculate each of the differences
ie: DIFF
mR =
1
Repeat for each remaining mR
_244.6_
value.
S = _0.011_ (not to exceed 0.045)
mR
Table 5: Reproducibility
Rev. A X-Ray Generator Service Manual Supplement
DIFFERENCE
= mR - mR.
1
DIFFERENCE
4.4
0.4
0.6
2.6
1.6
= mR - mR.
1
CPI Canada Inc
MAS = __________
DIFFERENCE
Square each difference. Then
calculate the sum of the difference
2
Sum of difference = _________
S = __________
DIFFERENCE
19.36
0.16
0.36
6.76
2.56
Square each difference. Then
calculate the sum of the difference
2
Sum of difference = _29.2_
S = _2.70_
2
2
.
mAs = _20_
2
2
.
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