Skip to main content
. Author manuscript; available in PMC: 2012 Jul 24.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Jul;58(7):1344–1354. doi: 10.1109/TUFFC.2011.1954

Fig. 3.

Fig. 3

(a) Two solutions to the equation relating the ROI lateral width to the width of the Gaussian apodization. The figure shows the two ways to create an ROI of the desired beam width. The solution requiring a wider apodization is more desirable because it results in a collimated beam and is thus consistent with the plane wave assumption. (b) The width of the Gaussian apodization as a function of the ROI lateral width at a fixed ROI depth of 5 cm. This is an illustration of the solutions to (6) and (17). The intersecting plane wave method has two possible solutions for creating an ROI of a particular width. The larger of the two is more desirable.