Establishing the image geometry reference values
To establish the image geometry reference values, proceed as follows:
1.
Print the QC test image or use the previously printed test image.
2.
To determine the reference values for geometry, measure the distances A
and B of the geometric square on the test image.
WARNING:
Make sure to measure distance A from the left edge of the
left line to the right edge of the right line and distance B
from the upper edge of the upper line to the lower edge of
the lower line.
We strongly recommend using a 30 cm (12-inch) machinist
scale with 0.5 mm divisions (1/64 inch).
3.
Record these values as reference dimensions A
ref
and B
ref
on Chart 4
(‘Geometric Consistency Control Chart’).
These charts will be used for the annual quality test.
4.
Save this film for future reference.
Related Links
on page 95
Charts for general radiography QC
Performing the annual QC tests
on page 104
100
| Dry 2.4M | Advanced Operation (key-operator mode)
2652B EN 20210601 1655
