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. Author manuscript; available in PMC: 2014 May 12.
Published in final edited form as: Ultrason Imaging. 2014 Jan;36(1):35–54. doi: 10.1177/0161734613510287

Figure 9.

Figure 9

Percent brightness increase is displayed as a function of steering angle for the tissue mimicking phantom and each of the two human subjects. The tissue phantom data do not indicate that the ability to increase speckle brightness by correcting refraction is spatially dependent. In the human data, subject 1 shows little spatial dependency except near +30°, which corresponds to the position of the contralateral sphenoid bone moving into the field of view, visible in the lower right portions of the coronal slices of Figure 7. The data of subject 2 shows a drastic decrease in brightness near −30° (corresponding to the location hypoechoic ventricles in Figure 8) and a large increase in brightness between 0 and +15°, corresponding to the location of the sphenoid bone indicated by the arrowhead in Figure 8.