5 Operating procedures
86500-IMG rev 3
GE Healthcare
47
How deep in the breast the lesion is can be estimated from images that
have been taken using a second projection. These can be taken earlier or
during the same procedure.
NOTE!
The collimator light turns on when tapping the foot switch and turns off
after 40 seconds. Do not tap the foot pedal repeatedly as this can alter the
amount of breast compression, resulting in impairment of biopsy
accuracy. For positioning, switch the collimator light on with the
collimator light switch.
The biopsy needle is inserted into the breast after careful estimation and
another image is taken to ensure that the correct localization has been
achieved.
NOTE!
Check the C-Arm rotation angle before performing a biopsy procedure.
5.10.9
Lesion marking
NOTE!
Release compression manually so that the hub of the needle does not to
catch on the localization paddle.
1
Mark the lesion with a steel wire or with dye for surgical biopsy. If you
use a control wire, fix it to the breast with tape.
2
Check the location of the wire end with an exposure. If required, the
location of the wire is altered and checked with another exposure.
Correct steel wire localization can be determined after insertion by
producing another image at a second projection angle. If this is done, the
amount of compression applied has to be quite small to ensure that the
localization wire does not move.
In a marking procedure, the breast is imaged with a biopsy paddle from
one projection. The openings from the paddle can be seen on the image
and with their help, the location of the lesion in this plane can be
estimated.
5.10.10 Spot exposure
The spot compression paddle is used in clinical studies with the 18x24cm
Bucky or cassette tunnel. It applies local compression to a specific area of
the breast. This moves the different tissue structures from overlying each
other giving improved visualization of those structures. The breast tissue
at the compressed area is also thinner allowing the use of a lower kV
setting, which improves image contrast.
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