2026-09-20T10:39:28Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/372082022-01-13T07:54:29Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Kullervo Hynynen and Roger G. Mark.
Khatri, Danish Suleiman
Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
2007-04-20T15:50:14Z
2007-04-20T15:50:14Z
2006
http://hdl.handle.net/1721.1/37208
80018772
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2006.
"October 14, 2005."
Includes bibliographical references (leaves 63-67).
Focused ultrasound continues to be investigated as an exciting technique for several medical therapy applications including tissue ablation. Phased array transducers serve as important devices for delivering the high intensity focused ultrasound to the targeted tissue. These arrays often produce undesired secondary foci called grating lobes that can result in heating of non-targeted healthy tissue. Grating lobes can be eliminated by setting the element-spacing between adjacent elements to 2 or less. The aim of this research is to construct and evaluate a 2-D planar phased array with close to /2 element-spacing. A 7x7 element array with element-spacing of 0.762mm was constructed using 1,3-piezocomposite material. Acoustic field measurements of the array focused at three different locations were taken to demonstrate its ability to scan the focus in a volume. In addition, a maximum average intensity of 5.54W/cm2 was measured for the unfocused array using radiation force measurements.
by Danish Suleiman Khatri.
M.Eng.
67 leaves
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Electrical Engineering and Computer Science.
Design and evaluation of a 2-D planar therapeutic ultrasound phased array
Thesis
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<Abstract>Focused ultrasound continues to be investigated as an exciting technique for several medical therapy applications including tissue ablation. Phased array transducers serve as important devices for delivering the high intensity focused ultrasound to the targeted tissue. These arrays often produce undesired secondary foci called grating lobes that can result in heating of non-targeted healthy tissue. Grating lobes can be eliminated by setting the element-spacing between adjacent elements to 2 or less. The aim of this research is to construct and evaluate a 2-D planar phased array with close to /2 element-spacing. A 7x7 element array with element-spacing of 0.762mm was constructed using 1,3-piezocomposite material. Acoustic field measurements of the array focused at three different locations were taken to demonstrate its ability to scan the focus in a volume. In addition, a maximum average intensity of 5.54W/cm2 was measured for the unfocused array using radiation force measurements.</Abstract>
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