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Behaviour of the 2.1-mm (14 G) automated biopsy needle in phantoms
S Abdsaleh1, E Azavedo, P G Lindgren
1Department of Radiology, University Hospital, Uppsala, Sweden.
Purpose:
To study the behaviour of the 2.1-mm (14 G) core biopsy needle in targets of different consistencies and to correlate the needle behaviour to lengths of the samples.
Material And Methods:
A series of butter blocks at temperatures of -5 degrees C, -2 degrees C, +1 degrees C, +4 degrees C, +7 degrees C, +10 degrees C, +13 degrees C, +16 degrees C and +19 degrees C simulating lesions of different hardness in human breast, were passed with needles (3 passes at each temperature). Inner needle behaviour was studied both with and without outer cannula effect.
Results:
At +4 degrees C to +13 degrees C the needle had a curved course, deviated to the side of its tip. At +4 degrees C, the needle was most deviated (range 4, 8, 10 degrees ) and the samples were largest (8, 12, 12 mm). At -5 degrees C to +1 degrees C the needle was bent, the cannula was not triggered and no sample was obtained. At +16 degrees C and +19 degrees C the needle had a straight course and the length of the sample was decreasing.
Conclusion:
Behaviour of the inner needle as well as the cannula depends on the hardness of the target. Targets of intermediate hardness yield adequate samples when the inner needle takes a curved course deviated toward the tip and get restored by the cannula.