Probes and Biopsy 13-17
13. Image of the biopsy target and the actual position of the
biopsy needle:
Diagnostic ultrasound systems produce tomographic
plane images with information of a certain thickness in
the thickness direction of the probe. (That is to say, the
information shown in the images consist all the
information scanned in the thickness direction of the
probe.) So, even though the biopsy needle appears to
have penetrated the target object in the image, it may
not actually have done so. When the target for biopsy is
small, dispersion of the ultrasound beam may lead to
image deviate from the actual position. Pay attention to
this.
If the target object and the biopsy needle appear in the
image as shown in the figures below (For reference
only):
The biopsy needle appears to reach the target object in
the image
Dispersion of the ultrasound beam
The biopsy needle may not have actually entered the
target object even though it appears to have done so on
the image. To avoid this problem, note points below:
Do not rely only on the needle tip on the image. Pay
careful attention to that, when the biopsy needle comes
into the target object or contacts with it, the object
should shift slightly.
Before you perform the biopsy, please evaluate the size
of the object and confirm if the biopsy can be carried
out.
CAUTION:
When using the needle-guided bracket wear sterile gloves to
prevent infection.
Target
Biopsy
Probe
Needle
Ultrasound beam
Target
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