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A spherical high intensity focused ultrasound phased array with unequal space between elements
Author(s): LI Guowei, CHEN Yazhu
Pages: 117-
120
Year: 2001
Issue:
2
Journal: ACTA ACUSTICA
Abstract: 讨论了一种新型的不等间距排列的球面高强度聚焦超声相控阵列,通过阵元间的不等间距排列明显的降低了栅瓣,使在阵元间距在4λ的情况下,栅瓣低于-20dB。通过优化设计发现在0.5MHz的发射频率时,采用231个直径为10mm的圆形阵元组成的球面阵列可以在轴向10~15cm,径向半径2cm的圆柱区域形成声强800W/cm2的高强度聚焦。同时还可形成多焦点,实现大肿瘤的超声热疗。
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