• Parmida Beigi, Robert Rohling, Tim Salcudean, Victoria A Lessoway, and Gary C Ng.
• Electrical and Computer Engineering Department, University of British Columbia, Vancouver, British Columbia, Canada. Electronic address: parmidab@ece.ubc.ca.
• Ultrasound Med Biol. 2015 Jul 1; 41 (7): 2057-70.

AbstractDescribed here is a novel approach to needle localization in 3-D ultrasound based on automatic detection of small changes in appearance on movement of the needle stylus. By stylus oscillation, including its full insertion into the cannula to the tip, the image processing techniques can localize the needle trajectory and the tip in the 3-D ultrasound volume. The 3-D needle localization task is reduced to two 2-D localizations using orthogonal projections. To evaluate our method, we tested it on three different ex vivo tissue types, and the preliminary results indicated that the method accuracy lies within clinical acceptance, with average error ranges of 0.9°-1.4° in needle trajectory and 0.8-1.1 mm in needle tip. Results also indicate that method performance is independent of the echogenicity of the tissue. This technique is a safe way of producing ultrasonic intensity changes and appears to introduce negligible risk to the patient, as the outer cannula remains fixed.Copyright © 2015 World Federation for Ultrasound in Medicine & Biology. Published by Elsevier Inc. All rights reserved.

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