GE Medical Systems 500, User Manual, Page: 550 / 636

Preparing for a Biopsy
LOGIQ 500 Basic Users Manual
2276612–100 Rev. 0
15–38
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Determining Needle Length
NOTE: Press the Measurement key once to display the
integrated biopsy depth cursor and center line while the
guidezone is present. Use the Trackball to measure the
needle length. Needle length is from the top of needle barrel to
the target.
2
1
1 Needle Length
2 Target
Figure 15–12. Needle Length Measurement
Pressing measurement while the biopsy guidezone is displayed
will add a line down the center of the guidezone with a depth
marker that can be adjusted with the Trackball.
The needle may vary from the center line or guidezone for
various reasons:
S
Needle barrel to needle clearance or strength.
S
Bracket manufacturing tolerance.
S
Needle deflection due to tissue resistance.
S
Needle size chosen. Thinner needles may deflect more.
S
Wrong needle guide type selection in Set Up/Custom
Display page 1.
The display should be carefully monitored during a biopsy for
any needle deviation from the center line or guidezone.
.
CAUTION