Ziehm Imaging, Inc.
Vision Installation Manual
MAN 06-0015, Rev. A
Page 15
M a i n t e n a n c e R e p o r t : C h e c k R e p r o d u c i b i l i t y
8. Observe the mA value displayed by the multimeter and write this value into the
box below.
9. If mA value displayed by the multimeter is > 10% of 20 mA, then the generator
must be replaced.
Check
Reproducibility
The purpose of the following test is to ensure that the system consistently produces a dose
level that is within FDA tolerances, for every technique factor. This test consists of taking a
set of four exposures, for each technique factor, within a sixty-minute time period.
Make sure that:
• the dosimeter is calibrated and working properly
• measurements are made one-after-another
• exposure technique is reset to test settings after each measurement
• all measurements are made within 60 minutes, from start to finish, and
• that you do not exceed tube loading.
Dosimeter Information
Write the following information regarding your dosimeter into the box below.
Coefficient of variation
For any specific combination of selected technique factors, the estimated coefficient of
variation of radiation exposure must not exceed 0.045.
The FDA has established the following: “All variable controls for technique factors shall
be adjusted to alternate settings and reset to the test setting after each measurement. All
values for percent line voltage regulation shall be 1% of the mean value for all
measurements.” (See 32 CFR 1020.31 (b) (c)).
Test
1. Make sure that the available power supply meets the voltage requirements stated
in Technical Data at the end of this manual.
2. Place a dosimeter probe in the center of the x-ray path, 70 cm from the focal spot,
as shown below.
Radiography mA value
Dosimeter number:
Manufacturer:
Model Number:
Serial Number:
Chamber Serial Number:
Date of last calibration:
