Capintec CAPTUS 4000e - Mda Test

CAPINTEC, INC. CAPTUS
®
4000e
August 22 QUALITY ASSURANCE 5-19
Figure 5-21
Interpreting the Chi-Square Results – Chi-Square values are given in the following table
for 5, 10, 15, and 20 repetitions. The Chi-Square Test results should fall between the 0.95
and 0.05 probability values in the table below almost all of the time. The more stringent 0.90
and 0.10 values are given for reference.
# Repetitions
0.95
0.90
0.10
0.05
5
.711
1.06
7.78
9.49
10
3.33
4.17
14.7
16.9
15
6.57
7.79
21.1
23.7
20
10.1
11.7
27.2
30.1
If the Chi-Square value is out of range, perform the test again. If the test passes the second
time, then the system is functioning properly.
If the Chi-Square value is out of range after the second test, check the following:
 The positioning of the rod source, especially for the Probe detector.
 Ensure that there are no other sources (including dosed patients) in the area.
If a problem is found with any of the two items above, then correct the problem and repeat
the Chi-Square Test.
In no problems are found with the above items, the out of range Chi-Square value may
indicate a problem with the counter/timer mechanism of the system or the detector itself.
Contact Capintec’s only Authorized Service Center for service.
 To print current results for record keeping, select the Print button or press Alt+P on
the Constancy Test screen after the test is completed.
 To view or print results for all of the Quality Assurance tests performed to date, select
the Print / View History button or press Alt+V (Refer to the VIEWING AND
PRINTING HISTORY section on page 5-24).
MDA TEST
CAUTION: Calibration is recommended before making any measurements. Refer to
the AUTO CALIBRATION section on page 5-5.