13-44 Probes and Biopsy
13.2.5 iNeedle (Needle Visualization Enhancement)
During a biopsy, the metal needle attached to the probe pierces the tissue at a certain angle. Due
to the needle's acoustic impedance, the ultrasonic beam cannot penetrate the metal needle and a
reflecting boundary is formed. As in Figure 1, if the deflection angle is very large, the needle
display is not clear.
In deflected ultrasound transmission, the beam direction is perpendicular to the needle direction
and the reflection direction is the same as the needle, as shown in Figure 2, meaning the needle
display in the ultrasound image is very clear. The system provides additional deflection
transmission that is approximately perpendicular to the metal needle when the normal
transmission (perpendicular to the transducer surface) is being processed. The deflection angle
can be chosen by the user.
iNeedle is an option.
Figure 1 Figure 2
To enter/exit iNeedle
To enter iNeedle
Tap on the left part of the image area.
To exit iNeedle
Tap[iNeedle] again or tap [B] to enter B mode.
Best angle indication
In iNeedle mode, recommended needle angle is given on the top of the screen. As shown in the
above figure, the current recommended angle is 50° to the horizontal plane.
Needle Direction
This function adjusts the biopsy needle direction according to actual direction of
needle insertion. The iNeedle region changes correspondingly.
Tap [Image] to open the menu, and use [Needle Dir.] control to select the
direction.
B/iNeedle
This function is used to display the B image and iNeedle image synchronously.
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