本文關(guān)鍵詞： 磁聲效應(yīng) 熱聲效應(yīng) 感應(yīng)式磁聲成像 磁熱聲成像 脈沖磁場　出處：《生物醫(yī)學(xué)工程學(xué)雜志》2017年01期 　論文類型：期刊論文

【摘要】：我們根據(jù)電磁場輻照低電導(dǎo)率樣本時電磁場和聲波場之間的耦合關(guān)系,對脈沖磁激勵的磁聲效應(yīng)和熱聲效應(yīng)展開研究。本文基于電磁場理論和聲波傳播理論知識,推導(dǎo)了脈沖磁激勵的聲壓波動方程;構(gòu)建二維載流線圈和低電導(dǎo)率圓形薄片模型以模擬成像物理環(huán)境,利用有限元方法分析瞬態(tài)電磁場;并且根據(jù)電磁場仿真結(jié)果,進行磁聲效應(yīng)和熱聲效應(yīng)所產(chǎn)生的聲場仿真計算。仿真結(jié)果表明,微秒級高斯脈沖磁場激勵下,低電導(dǎo)率樣本中熱聲效應(yīng)比磁聲效應(yīng)大,且起主要作用;微秒級高斯脈沖磁場和0.2 T靜磁場激勵下,低電導(dǎo)率樣本中熱聲效應(yīng)和磁聲效應(yīng)共存。該研究為感應(yīng)式磁聲成像和磁熱聲成像的進一步應(yīng)用奠定了基礎(chǔ)。
[Abstract]:According to the coupling relationship between electromagnetic field and acoustic field when irradiated by electromagnetic field with low conductivity sample. The magnetoacoustic and thermoacoustic effects of pulsed magnetic excitation are studied. Based on the theory of electromagnetic field and the theory of acoustic wave propagation, the wave equation of sound pressure under pulsed magnetic excitation is derived. A two-dimensional current-carrying coil and a low-conductivity circular thin slice model were constructed to simulate the imaging physical environment and the transient electromagnetic field was analyzed by finite element method. And according to the results of electromagnetic field simulation, the simulation results of magnetoacoustic effect and thermoacoustic effect are carried out. The simulation results show that, under the excitation of microsecond Gao Si pulse magnetic field. The thermoacoustic effect in low conductivity samples is larger than that of magnetoacoustic effect and plays a major role. Under the excitation of microsecond Gao Si pulse magnetic field and 0.2 T static magnetic field, thermoacoustic effect and magnetoacoustic effect coexist in low conductivity samples. This study lays a foundation for the further application of inductive magnetoacoustic imaging and magnetothermoacoustic imaging.
【作者單位】： 中國科學(xué)院電工研究所;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金(51137004,51477161,61427806)
【分類號】：R312
【正文快照】： 引言長期以來,生物組織電特性的研究是學(xué)者關(guān)注的焦點。許多研究表明,不同的正常組織以及器官之間、正常組織與病變組織之間的電特性具有較大的差異[1]。例如正常乳腺組織的電導(dǎo)率是0.4 S/m,但是癌變的乳腺組織的電導(dǎo)率是4 S/m[2-4]。因而利用這一性質(zhì)可以了解生物組織生理和，

本文編號：1481975