TY - JOUR
T1 - Design of a high frequency annular array for medical ultrasound
AU - Snook, Kevin A.
AU - Ritter, Timothy A.
AU - Shrout, Thomas R.
AU - Shung, K. Kirk
N1 - Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2001
Y1 - 2001
N2 - This paper reports the results of an effort of developing a 50 MHz annular array which incorporates a fine grain lead titanate as the piezoelectric material. The array achieves a better sensitivity than a comparable PVDF annular array and demonstrates low lateral coupling for reduced cross-talk. Using resonance techniques, the lead titanate has been fully characterized. The ceramic shows a clamped permittivity (ε33s/ε0) equal to 180, a thickness coupling kt, of 0.49 and a planar coupling, kp, of 0.08. This material was fabricated into an annular array with an overall diameter of 5 mm and six equal-area elements. Separation of the elements was achieved using laser micromachining. Utilizing the waveforms from one-dimensional modeling, intensity field calculations predicted a maximum -6 dB lateral beamwidth of 160 μm over a six focal-zone region covering a 10 mm depth. Application of a triangular electrical apodization scheme across the elements resulted in a reduction in grating lobe amplitude below -26 dB.
AB - This paper reports the results of an effort of developing a 50 MHz annular array which incorporates a fine grain lead titanate as the piezoelectric material. The array achieves a better sensitivity than a comparable PVDF annular array and demonstrates low lateral coupling for reduced cross-talk. Using resonance techniques, the lead titanate has been fully characterized. The ceramic shows a clamped permittivity (ε33s/ε0) equal to 180, a thickness coupling kt, of 0.49 and a planar coupling, kp, of 0.08. This material was fabricated into an annular array with an overall diameter of 5 mm and six equal-area elements. Separation of the elements was achieved using laser micromachining. Utilizing the waveforms from one-dimensional modeling, intensity field calculations predicted a maximum -6 dB lateral beamwidth of 160 μm over a six focal-zone region covering a 10 mm depth. Application of a triangular electrical apodization scheme across the elements resulted in a reduction in grating lobe amplitude below -26 dB.
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M3 - Conference article
AN - SCOPUS:0035732308
SN - 1051-0117
VL - 2
SP - 1161
EP - 1164
JO - Proceedings of the IEEE Ultrasonics Symposium
JF - Proceedings of the IEEE Ultrasonics Symposium
T2 - 2001 Ultrasonics Symposium
Y2 - 6 October 2001 through 10 October 2001
ER -