基于近场互谱法的医用聚焦超声场多参数检测
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摘要
为实现医用聚焦超声场声学性能快速、准确检测,提出基于近场互谱测量技术的声参数检测方法。首先介绍了近场互谱法测量原理,实现聚焦声场的声压、声强、声功率检测;然后在COMSOL下建立聚焦换能器辐射声场有限元模型,分析其声场聚焦特性和传播形态,给出检测方案;最后,搭建了实验平台,验证了该方法的有效性和正确性。结果表明,通过聚焦声场的近场声源面预测焦域的声压分布,估算声功率,实现了对聚焦超声场的多个声性能参数检测,且具有较高的精度,有望应用于医用换能器的现场检测,有效监控医用聚焦超声设备的声性能,保证设备安全使用且满足治疗效果。
In order to realize the fast and accurate detection of the acoustic performance of medical focused ultrasound field, an acoustic parameter detection method based on near field cross spectral measurement method is proposed. Firstly, the measurement principle of near-field cross-spectral method is introduced to realize the sound pressure, sound intensity and sound power detection of the focused sound field. Then the finite element model of the radiated sound field of the focused transducer is established under COMSOL, and the sound field focusing characteristics and propagation shape are analyzed to obtain the detection scheme. Finally, an experimental platform is built to verify the validity and correctness of the method. The results show that the sound pressure distribution of the focal field and the estimation of sound power are predicted by the near-field sound source surface of the focused sound field, which achieves multiple acoustic performance parameter detection for the focused ultrasound field with high precision. It is expected to be applied to the field test of medical transducers, effectively monitoring the acoustic performance of medical focused ultrasound equipment to ensure safe use of the equipment and meet the therapeutic effect.
In order to realize the fast and accurate detection of the acoustic performance of medical focused ultrasound field, an acoustic parameter detection method based on near field cross spectral measurement method is proposed. Firstly, the measurement principle of near-field cross-spectral method is introduced to realize the sound pressure, sound intensity and sound power detection of the focused sound field. Then the finite element model of the radiated sound field of the focused transducer is established under COMSOL, and the sound field focusing characteristics and propagation shape are analyzed to obtain the detection scheme. Finally, an experimental platform is built to verify the validity and correctness of the method. The results show that the sound pressure distribution of the focal field and the estimation of sound power are predicted by the near-field sound source surface of the focused sound field, which achieves multiple acoustic performance parameter detection for the focused ultrasound field with high precision. It is expected to be applied to the field test of medical transducers, effectively monitoring the acoustic performance of medical focused ultrasound equipment to ensure safe use of the equipment and meet the therapeutic effect.
引文
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[14] 周广林,陈心昭.扫描速度对扫描声强法测量声功率精度的影响[J].仪器仪表学报,2006,27(12):1614-1618.ZHOU G L,CHEN X ZH.Influence of scanning speed on the accuracy of sound intensity measurement by scanning sound intensity method[J].Chinese Journal of Scientific Instrument,2006,27(12):1614-1618.
[15] 李冬,苑修乐,杜广生.超声波流量计中反射装置的声-固耦合分析[J].仪器仪表学报,2015,36(9):1945-1952.LI D,YUAN X L,DU G SH.Acoustic-solid coupling analysis of reflection devices in ultrasonic flowmeters[J].Chinese Journal of Scientific Instrument,2015,36(9):1945-1952.
[16] 于群,王月兵,曹文旭,等.聚焦换能器声强和声功率测量方法研究[J].中国测试,2017,43(1):27-32.YU Q,WANG Y B,CAO W X,et al.Study on sound intensity and sound power measurement of focused transducer[J].China Measurement & Testing Technology,2017,43(1):27-32.
[2] 戚萌,王鑫,刘晓宙.大张角聚焦换能器中的张角变化对生物组织温度场的影响[J].南京大学学报(自然科学),2017,53(1):114-121.QI M,WANG X,LIU X ZH.Influence of the change of the opening angle on the temperature field of biological tissue in a large-angle angled transducer[J].Journal of Nanjing University(Natural Science),2017,53(1):114-121.
[3] 丁亚军.高强度聚焦超声治疗剂量控制关键问题研究[D].长沙:湖南师范大学,2013.DING Y J.Research on key problems of dose control for high intensity focused ultrasound therapy[D].Changsha:Hunan Normal University,2013.
[4] 郭各朴,宿慧丹,丁鹤平,等.基于电阻抗层析成像的高强度聚焦超声温度监测技术[J].物理学报,2017,66(16):135-146.GUO G P,SU H D,DING H P,et al.High-intensity focused ultrasound temperature monitoring technology based on electrical impedance tomography[J].Acta Physica Sinica,2017,66(16):135-146.
[5] 韩冥生,杨平,祝海江.浮力变化的量热法与辐射力天平法测量超声功率比较研究[J].计量学报,2015,36(1):82- 86.HAN M SH,YANG P,ZHU H J.Experimental reasearch on the calorimetry method and radition force balance method for measurement of ultrasound power[J].Acta Metrologica Sinica,2015,36(1):82- 86.
[6] 吴斌,符浩,何存富.超声导波虚拟相控聚焦方法研究[J].仪器仪表学报,2013,34(3):509- 516.WU B,FU H,HE C F.Research on virtual phased focusing method for ultrasonic guided waves[J].Chinese Journal of Scientific Instrument,2013,34(3):509- 516.
[7] 王成,郑慧峰,王月兵,等.基于近场测量法的水声换能器声场重建方法研究[J].计量学报,2016,37(5):520- 524.WANG CH,ZHENG H F,WANG Y B,et al.Research on underwater acoustic field measurement system based on near-field measurement method[J].Acta Metrologica Sinica,2016,37(5):520- 524.
[8] 周东旺,李舜酩,江星星,等.基于传递函数估计的近场声全息的噪声源识别[J].仪器仪表学报,2015,36(12):2874- 2880.ZHOU D W,LI SH M,JIANG X X,et al.Noise source identification of near-field acoustical holography based on transfer function estimation[J].Chinese Journal of Scientific Instrument,2015,36(12):2874- 2880.
[9] BA T,YAUN B,WEI P,et al.Study on the near-field acoustic holography reconstruction based on DFT[J].Procedia Engineering,2011(15):2685- 2689.
[10] 宋玉来,胡红生.非规则结构表面多声源近场声全息方法[J].仪器仪表学报,2017,38(5):1126-1134.SONG Y L,HU H SH.Near-field acoustic holography for multiple sound sources on irregular structure surface[J].Chinese Journal of Scientific Instrument,2017,38(5):1126-1134.
[11] 籍顺心.近场声全息技术及其应用[J].声学学报,2014(5):623- 623.JI SH X.Near-field acoustic holography and its application[J].Journal of Acoustics,2014(5):623- 623.
[12] SHAW A.A buoyancy method for the measurement of total ultrasound power generated by HIFU transducers[J].Ultrasound in Medicine & Biology,2008,34(8):1327- 42.
[13] 阮鹏,陈智军,付大丰,等.基于COMSOL的声表面波器件仿真[J].测试技术学报,2012,26(5):422- 428.RUAN P,CHENG ZH J,FU D F,et al.Simulation of surface acoustic wave device based on COMSOL[J].Journal of Test and Measurement Techo,2012,26(5):422- 428.
[14] 周广林,陈心昭.扫描速度对扫描声强法测量声功率精度的影响[J].仪器仪表学报,2006,27(12):1614-1618.ZHOU G L,CHEN X ZH.Influence of scanning speed on the accuracy of sound intensity measurement by scanning sound intensity method[J].Chinese Journal of Scientific Instrument,2006,27(12):1614-1618.
[15] 李冬,苑修乐,杜广生.超声波流量计中反射装置的声-固耦合分析[J].仪器仪表学报,2015,36(9):1945-1952.LI D,YUAN X L,DU G SH.Acoustic-solid coupling analysis of reflection devices in ultrasonic flowmeters[J].Chinese Journal of Scientific Instrument,2015,36(9):1945-1952.
[16] 于群,王月兵,曹文旭,等.聚焦换能器声强和声功率测量方法研究[J].中国测试,2017,43(1):27-32.YU Q,WANG Y B,CAO W X,et al.Study on sound intensity and sound power measurement of focused transducer[J].China Measurement & Testing Technology,2017,43(1):27-32.
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