摘要
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，使在陈元间距在 ４λ的情况下，栅瓣低于－２０ ｄＢ．通过优化设计发现在 ０．５ ＭＨｚ的发射频率时，采用 ２３１个直径为 １０ ｍｍ的圆形阵元组成的球面阵列可以在轴向 １０～ １５ ｃｍ，径向半径 ２ ｃｍ的圆柱区域形成声强 ８００ Ｗ／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。
Here we provided a new spherical HIFU (High intensity Focused Ultrasound) phased array with unequal center-to-center space between elements that was proved can lower the grating-lobe. Even with 4A element space, the grating lobe was still below -20 dB. With optimization calculation we found that with 231 circular elements of 1 cm diameter and at 0.5 WHz application frequency, the array could form a high intensity focus of 800 W/cm2 in a 2 cm underside radius cylinder area at 10 ~ 15 cm depth. And it also could accomplish accomplish-focus for realizing ultrasound hyperthermia to large humor.
出处
《声学学报》
EI
CSCD
北大核心
2001年第2期117-120,共4页
Acta Acustica
