Accurate identification of the interventional medical device during ultrasound-guided minimally-invasive procedures is of critical importance. A real-time 3D needle tracking system has been developed that utilises a fiber-optic, photoacoustic US transmitter integrated into the needle tip and a custom 2D, 4x4 receiver array attached to a clinical US imaging probe. Ultrasound signals received by the array are used to determine the location of source, which is then registered to the imaging probe and visualised. During initial laboratory measurements of tracking accuracy, the mean displacement between tracked and true distances from the array face was 0.8 ± 0.8 mm.
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