任意三角形和六边形超声阵元及其高填充率阵列的声场仿真研究

Acoustic field simulation of spherical ultrasound arrays filled with arbitrary triangular and hexagonal elements

为提高超声设备中二维相控阵列聚焦换能器的面积填充率,提升聚焦区域的超声能量和治疗效率,本研究利用空间脉冲响应理论对任意三角形阵元进行声场计算,通过对三角形阵元进行二维平面旋转完成了六边形阵元声场仿真,并通过对六边形阵元进行三维空间旋转实现了球面阵列聚焦换能器声场仿真。仿真结果显示,六边形7阵元球面填充率提高了6.1%,其-6 dB焦域横向宽度为2.0 mm、纵向长度为30.1 mm;19阵元球面填充率提高了5.5%,其-6 dB焦域横向宽度为1.2 mm、纵向长度为9.8 mm,可实现高精度超声治疗。本研究可为任意三角形和六边形及不规则形状阵元声场仿真提供新方法,且为高填充率的球面聚焦超声换能器设计提供新思路。

In order to improve the area filling rate of two-dimensional phased array focused transducers in ultrasound equipment,and improve the ultrasonic energy and treatment efficiency of the focusing area,the spatial impulse response theory was used to calculate the sound field of any triangular array.The sound field simulation of hexagonal array was completed by two-dimensional plane rotation of the triangular array,and the sound field simulation of the spherical array focusing transducer was realized by three-dimensional rotation of the hexagonal array.The simulation results showed that the fill-factor of a 7-element array transducer was increased by 6.1%.The transverse width of its-6 dB focal area was 2.0 mm and the corresponding longitudinal length was 30.1 mm.Furthermore,the fill-factor of a 19-element array transducer was increased by 5.5%.The transverse width of the-6 dB focal area was 1.2 mm and the longitudinal length was 9.8 mm.It can realize high precision ultrasonic treatment in a smaller focal area size,It provides a new method for the sound field calculation of the polygonal ultrasound transducer element,and a new idea for the design of the spherical focused ultrasound transducer with high fill-factor.