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Background-oriented schlieren imaging and tomography for rapid measurement of FUS pressure fields: initial results

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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... Figure 1 illustrates our current experimental setup, comprising a water tank, a FUS transducer (Sonic Concepts HB 101, Bothell, WA), an Android tablet (Google Nexus 7) to display the background images, and a webcam (Logitech C920) to record the images... 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... A parallel beam geometry was assumed... Figure 2 shows how BOS images depend on line widths and orientation... Figure 3 compares BOS images generated by summing across line positions and angles to eliminate stripe artifacts... Figure 4 illustrates the forward model and demonstrates that an accurate reconstruction can be achieved from data acquired under that model... Next we will translate our reconstruction to the true fan beam geometry and construct a motorized gantry to enable projections at multiple angles.

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(a) Varying line widths, 0° angle. Thick widths can leave large gaps in the pattern, and thin widths can wash it out (arrows). (b) Varying angle of rotation, 1.8 mm line width. Different parts of the field pattern are emphasized at different angles.
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Figure 2: (a) Varying line widths, 0° angle. Thick widths can leave large gaps in the pattern, and thin widths can wash it out (arrows). (b) Varying angle of rotation, 1.8 mm line width. Different parts of the field pattern are emphasized at different angles.

Mentions: Figure 2 shows how BOS images depend on line widths and orientation. Figure 3 compares BOS images generated by summing across line positions and angles to eliminate stripe artifacts. Figure 4 illustrates the forward model and demonstrates that an accurate reconstruction can be achieved from data acquired under that model. Next we will translate our reconstruction to the true fan beam geometry and construct a motorized gantry to enable projections at multiple angles.


Background-oriented schlieren imaging and tomography for rapid measurement of FUS pressure fields: initial results
(a) Varying line widths, 0° angle. Thick widths can leave large gaps in the pattern, and thin widths can wash it out (arrows). (b) Varying angle of rotation, 1.8 mm line width. Different parts of the field pattern are emphasized at different angles.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4489441&req=5

Figure 2: (a) Varying line widths, 0° angle. Thick widths can leave large gaps in the pattern, and thin widths can wash it out (arrows). (b) Varying angle of rotation, 1.8 mm line width. Different parts of the field pattern are emphasized at different angles.
Mentions: Figure 2 shows how BOS images depend on line widths and orientation. Figure 3 compares BOS images generated by summing across line positions and angles to eliminate stripe artifacts. Figure 4 illustrates the forward model and demonstrates that an accurate reconstruction can be achieved from data acquired under that model. Next we will translate our reconstruction to the true fan beam geometry and construct a motorized gantry to enable projections at multiple angles.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

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... Figure 1 illustrates our current experimental setup, comprising a water tank, a FUS transducer (Sonic Concepts HB 101, Bothell, WA), an Android tablet (Google Nexus 7) to display the background images, and a webcam (Logitech C920) to record the images... 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... A parallel beam geometry was assumed... Figure 2 shows how BOS images depend on line widths and orientation... Figure 3 compares BOS images generated by summing across line positions and angles to eliminate stripe artifacts... Figure 4 illustrates the forward model and demonstrates that an accurate reconstruction can be achieved from data acquired under that model... Next we will translate our reconstruction to the true fan beam geometry and construct a motorized gantry to enable projections at multiple angles.

No MeSH data available.