CPI CMP 200 Series Service Manual page 247

Reproducibility, Linearity, & HVL Testing
3.0 REPRODUCIBILITY (Cont)
3 point = 80% of maximum kV, 250 ms, mA to give 100 - 500 mR (0.9 – 4.4 mGy) dose.
2 point = 80% of maximum kV, mAs to give 100 - 500 mR (0.9 – 4.4 mGy) dose. mAs = __________
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 =
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Page 6
DOSE (K)
mGy
Calculate each of the differences
ie: DIFF
K =
1
Repeat for each remaining K
________
value.
S = _________ (not to exceed 0.045)
K
Table 4: Reproducibility
DOSE (K)
mGy
2.17
2.14
2.13
2.11
2.12
Calculate each of the differences
ie: DIFF
K =
1
Repeat for each remaining K
_2.134_
value.
S = _0.011_ (not to exceed 0.045)
K
Table 5: Reproducibility
Rev. C
DIFFERENCE
= K - K.
1
DIFFERENCE
0.036
0.006
0.004
0.024
0.014
= K - K.
1
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DIFFERENCE
Square each difference. Then
calculate the sum of the difference
2
Sum of difference = _________
S = __________
DIFFERENCE
0.001296
0.000036
0.000016
0.000576
0.000196
Square each difference. Then
calculate the sum of the difference
2
Sum of difference = _0.00212_
S = _0.0230_
2
2
.
mAs = _20_
2
2
.
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