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Diagnostic and high intensity focused ultrasound (HIFU) phased-arrays provide many advantages over single element transducers, including dynamic focal beam steering capability. These arrays should be fabricated with element-to-element pitch smaller than half the wavelength at the resonance frequency to avoid unwanted secondary foci due to grating lobes and side lobes. However, smaller pitch increases...
A hemispherical-focused, ultrasound phased array was designed and fabricated using 1372 cylindrical piezoelectric transducers that utilize lateral coupling for noninvasive transcranial therapy. The cylindrical transducers allowed the electrical impedance to be reduced by at least an order of magnitude, such that effective operation could be achieved without electronic matching circuits. In addition,...
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