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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,...
A hemispherical focused ultrasound phased-array was designed and fabricated for noninvasive transcranial therapy. The array had a diameter of 31 cm. It was constructed with 1372 custom-made 6 mm long, 10 mm and 7.2 mm outer and inner diameter, cylindrical shape PZT-4 tube elements. The elements were driven at length-mode resonance (306 kHz) or third harmonic (840 kHz) frequency, which reduced the...
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