Visualization of high intensity focused ultrasound fields using image subtraction Schlieren technique and evaluation of focus depth
2016 Volume 54Annual Issue Proc Pages 1T3-4-1-1-1T3-4-1-2
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2016 Volume 54Annual Issue Proc Pages 1T3-4-1-1-1T3-4-1-2
A high intensity focused ultrasound (HIFU) field of a transducer for ultrasound therapy was visualized using an image subtraction Schlieren technique. The transducer of 110 mm in diameter and 100 mm in focal length was driven by a burst pulse of 1.58 MHz in center frequency and of 10 W or 100 W in input electric power. 10 instantaneous HIFU fields were visualized at 10 different phases, and a beam profile was determined by superimposing the fields. FWHMs of the beam were 5.8 mm in a visualized field but was 7.3 mm in a field determined by hydrophone measurement.
