Abstract
FUS pressure field mapping is important for dosimetry, quality assurance, and other uses. Hydrophone measurements are the current standard, and are accurate but costly and slow. As a simple low-cost alternative, background-oriented schlieren (BOS) imaging of ultrasound fields has been proposed.[1] In that technique, a predetermined image (usually a grid of lines or a random dot pattern) is placed on one side of a water tank and viewed from the other side, through the water and FUS pressure field. When the FUS is on, spatial variations in the water’s index of refraction are created that blur the image. Subtracting images with and without the FUS field provides a rapid visualization of it. The method has also been used to tomographically reconstruct air flow density.[2] The overall goal of the present work is to develop a low-cost BOS hardware system and BOS tomography acquisitions and reconstructions to enable rapid and cheap volumetric measurements of continuous-wave FUS fields. Here we present our current progress towards that goal.
Highlights
Background/introduction FUS pressure field mapping is important for dosimetry, quality assurance, and other uses
In the stage of the project the tablet and webcam will be mounted on a motorized gantry that rotates around the tank to acquire background-oriented schlieren (BOS) images at multiple projection angles
BOS Tomography Simulation A 2D simulation was performed in MATLAB to validate the principles underlying BOS tomography, by implementing the forward model relating a spatially-varying index of refraction pattern to acquired BOS projection images, and a conjugate gradient reconstruction to invert that model
Summary
Background/introduction FUS pressure field mapping is important for dosimetry, quality assurance, and other uses. MATLAB (Mathworks) runs on a control PC to automate the acquisitions.
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