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32 | CR Mammography | Getting started
Limitations
Limitations for image appearance
• Absolute measurements are not supported (even on true size prints).
There is a deviation caused by the X-ray projection. This phenomenon is
identical to conventional film/screen situations. This is also the case on
the softcopy reading station.
• Under typical mammo exposures digitized with CR 25.0, CR 75.0, CR 35-X
or CR 85-X (not applicable for CR 30-Xm or DX-M), the image shows a
grey line along the image edge only. This is due to the edge protection of
the image plate. However, there is no impact on the diagnostic output.
• To make sure that no diagnostic data is lost, the digitizer scans over the
edge of the image plate. This may cause a black or white border at the
thorax side in exceptional cases, for example with large implants.
However, there is no impact on the diagnostic output.
Limitations for CR MM2.0 and CR MM3.0 Mammo cassettes
• The suction cup in the older generation cassette can leave a round shaped
artefact that can be interfering with the diagnostic area. This artefact is
typically positioned at the upper part of the image and close to the chest
wall. However, there is no impact on the diagnostic output.
• It has been reported that in exceptional cases the automatic window/level
processing fails. This results in completely black or white images.
Adjusting the window/level manually will solve this problem. There is no
need for retaking the images.
Limitations on workstation features
• Please note that because of the high resolution image size, some
interactive functions may take longer.
• Importing/Exporting or sending General Radiography images to a
dedicated mammography CR workstation is not supported.
• The CR display is not intended or suited for performing mammography
diagnosis; only for verification of mammography positioning.
• Following functions are disabled in the mammography application:
automatic image collimation, automatic image division detection, the
interactive image post-processing function (MUSICA button); except for
window/level processing, changing the study type related processing.
Background darkening is disabled for the mammo specialty exams.
• The LgM value or EI (Exposure Index) (this is the exposure consistency
indicator, used for General Radiography applications) is not relevant for
mammography images. This should not cause a problem for
mammography: the dose is controlled by the AEC.
• The automatic alignment of the chest wall will not be guaranteed if you
drag an image manually onto a layout on the NX CR workstation. This can
be corrected by clicking the true size button or manually roaming the
image.
2344Q EN 20180406 1001
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