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.
We have developed a clinically compatible, real-time ultrasound needle tracking system (UNT) that can be appended to a clinical ultrasound system, superimposing a crosshair onto the ultrasound image at the needle tip position. The UNT was developed under the ISO 13485 Medical Devices quality standard for deployment in the clinic. During handheld ultrasound guidance, the location of the needle tip within the imaging plane is determined from the acoustic signals received by an embedded fibre-topic hydrophone. Assessment of tracking accuracy found that the mean distance between tracked and true positions was 0.7 ± 0.4 mm with a repeatability of 0.3 ± 0.2 mm.
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