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Assessment of ultrasound modulation of near infrared light on the quantification of scattering coefficient
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10.1118/1.3456441
/content/aapm/journal/medphys/37/7/10.1118/1.3456441
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/7/10.1118/1.3456441
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A schematic diagram of the experimental setup.

Image of FIG. 2.
FIG. 2.

(a) Raw CCD images corresponding to a phase shift of (i) 0°, (ii) 90°, (iii) 180°, and (iv) 270° of the modulated laser diode with respect to ultrasound beat signal . (b). The one-dimensional intensity profile along the dotted line for the intensity images given in (a). The legend indicates the corresponding phase shifted image.

Image of FIG. 3.
FIG. 3.

Contribution to phase change (in %) from the background (excluding the focal region) compared to the focal region.

Image of FIG. 4.
FIG. 4.

(a) Plots of normalized DPF [given by Eq. (3)] measurements versus ultrasound pressure in the focal region. The error in the measurements is in the range of 1%–4%. (b) Plots showing the enhancement factor in effective [using Eq. (4)] with ultrasound drive voltage. The error in the enhancement is in the range of 2%–7%. The four different curves correspond to values of 100, 400, 800, and 1200 Hz (as given in legend) using a viscoelastic phantom corresponding to a storage modulus of 11.39 kPa.

Image of FIG. 5.
FIG. 5.

Plots of enhancement in effective versus ultrasound pressure in the focal region with for storage modulus of 11.39 and 40.35 kPa. The error in the measurements is in the range of 1%–7%.

Image of FIG. 6.
FIG. 6.

Comparison of experimental and Monte-Carlo simulation results in the enhancement of effective corresponding to increase in the ultrasound pressure in the focal region.

Image of FIG. 7.
FIG. 7.

Change in measured phase (numerically and experimentally) due to increase in at the focal region with kept constant at the background value of for .

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/content/aapm/journal/medphys/37/7/10.1118/1.3456441
2010-06-28
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Assessment of ultrasound modulation of near infrared light on the quantification of scattering coefficient
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/7/10.1118/1.3456441
10.1118/1.3456441
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