13-48 Probes and Biopsy
Needle guidance on the ultrasound image is for
reference only and cannot provide as sole guidance for
diagnosis basis.
The needle mark displayed on the ultrasound image
does not indicate the actual position of the needle.
Therefore, it should only be used as a reference.
Always monitor the relative positions of the biopsy
needle during the procedures.
Stop operation immediately when incorrect installation
or improper working status of the magnetic device is
observed. Contact the device manufacturer for further
action. Do not freeze an image while performing biopsy
procedure. Image of the biopsy target and the actual
position of the biopsy needle:Diagnostic ultrasound
system produces tomographic plane images with
information of a certain thickness in the thickness
direction of the transducer. (The information shown in
the images consist all the information scanned in the
thickness direction of the probe.) So, even though the
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. Image deviation is
shown as the figures below:
The biopsy needle appears to reach the target object in
the image
Dispersion of the ultrasound beam
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