Laser Generated Leaky Acoustic Waves for Visualization during Needle Biopsy
Date Issued
2016
Date
2016
Author(s)
Wu, Kai-Wen
Abstract
Ultrasound (US)-guided needle operations have been widely used to visualize both tissue anatomical structures and needle position in real time. However, the US transducer-needle angle is often limited due to specular reflection from the needle surface. We propose a new needle visualization method based on laser-induced leaky acoustic waves. The needle angle and position are calculated based on characteristics of guided waves and leaky acoustic waves. In our approach, the top of the needle shaft is illuminated by laser and guided acoustic waves are subsequently generated, propagating along the needle and leak to the surrounding medium that can be detected by the US transducer. This method was tested with a 26-gauge needle in both a tissue mimicking phantom and porcine muscle tissue. Results show that the detection depth is more than 50 mm and the insertion angle is up to 40°, both are superior than existing ultrasound and photoacoustic methods.
Subjects
leaky acoustic wave
laser-induced guided wave
image-guided biopsy
Type
thesis