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 135
Performing the Annual QC tests for mammography application
Verifying Acceptable Spatial Resolution and Artifact Levels and Low
Contrast Visibility for mammography application
WARNING:
Good viewing conditions are important for the correct
interpretation of both diagnostic and test images. Make sure
that the light box intensity (luminance) is between 3000 and
6000 cd/m² (4500 and 6500 °K) for mammography. Use a
magnifying glass and use shutters to collimate. Make sure the
ambient light is low.
To verify acceptable spatial resolution, artifact levels and low contrast
visibility, proceed as follows:
1.
Print the QC mammography test image or use the previously printed QC
mammography test image used to establish the daily operating density
levels.
2.
Visually check the test image for artifacts: no significant disturbing
artifacts should be visible.
3.
Check the spatial resolution in each of the three ovals. Within each oval
there are three groups, each having five dots. All five dots of each group
must be visible with a magnifying glass. The smallest cluster of 5 dots is
only visible if the viewing conditions are good.
4.
Check the Low Contrast Visibility at both the high (100 / 95%) and low
end (0 / 5%) of the density scale. You should be able to see the circle in
the square (refer to item 1 on the
‘QC mammography test image’
) and the
upper circle (refer to item 2 on the
‘QC mammography test image’
).
5.
Record these values at the top of Chart 3 (‘Artifacts and Spatial Resolution
Control Chart’).
6.
These charts will be used for the weekly quality test.
104
| DRY 3.4 | Advanced Operation (key-operator mode)
2602A EN 20191018 0826
Summary of Contents for 5364/500
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Page 12: ...12 DRY 3 4 DRY 3 4 2602A EN 20191018 0826 ...
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Page 87: ...The menu structure DRY 3 4 Advanced Operation key operator mode 87 2602A EN 20191018 0826 ...
