發(fā)布時(shí)間：2018-04-17 21:33

  本文選題：磁熱聲成像 + 脈沖磁場(chǎng)��； 參考：《高電壓技術(shù)》2017年08期

【摘要】：磁熱聲成像(MMTAI)是一種新型的人體疾病早期檢測(cè)電阻抗成像技術(shù),融合了傳統(tǒng)電阻抗成像高對(duì)比度和超聲成像高分辨率的優(yōu)勢(shì)。為了驗(yàn)證磁熱聲成像針對(duì)生物組織的可行性,研究了磁熱聲成像的原理,并搭建了相應(yīng)的實(shí)驗(yàn)系統(tǒng)。研究結(jié)果表明:將低電導(dǎo)率目標(biāo)體置于μs級(jí)脈沖寬度的脈沖磁場(chǎng)中,會(huì)在目標(biāo)體內(nèi)產(chǎn)生渦流,目標(biāo)體吸收焦耳熱后瞬時(shí)膨脹并發(fā)出聲信號(hào),聲信號(hào)含有目標(biāo)體的電導(dǎo)率信息;利用電磁場(chǎng)與聲場(chǎng)理論所推導(dǎo)的目標(biāo)體聲源計(jì)算式反映了聲源與電導(dǎo)率之間的關(guān)系;對(duì)磁-熱-聲多場(chǎng)耦合作用下產(chǎn)生的熱聲信號(hào)進(jìn)行檢測(cè)和分析,再利用時(shí)間反演法重建聲源分布;將含質(zhì)量分?jǐn)?shù)10%氯化鈉的凝膠仿體模型置于μs級(jí)脈沖寬度的脈沖磁場(chǎng)中,采用中心頻率為1 MHz的超聲換能器采集超聲信號(hào),信號(hào)被放大60 d B后的峰峰值約為4 m V,利用旋轉(zhuǎn)凝膠仿體采集的100組信號(hào)所重建的熱聲圖像能反映低電導(dǎo)率凝膠仿體的電導(dǎo)率分布。此實(shí)驗(yàn)驗(yàn)證了該方法用于低電導(dǎo)率介質(zhì)成像的可行性,為該方法用于生物組織成像的研究提供了依據(jù)。
[Abstract]:MMTAI (Magnetic Thermoacoustic Imaging) is a new electrical impedance imaging technique for early detection of human diseases, which combines the advantages of traditional electrical impedance imaging with high resolution in ultrasonic imaging.In order to verify the feasibility of magnetothermoacoustic imaging for biological tissue, the principle of magnetothermoacoustic imaging is studied, and the corresponding experimental system is built.The results show that when the low conductivity target is placed in the pulse magnetic field with the pulse width of 渭 s, the eddy current will be produced in the target body, and the target body will instantly expand after absorbing the Joule heat and send out the acoustic signal. The acoustic signal contains the conductivity information of the target body.Based on the theory of electromagnetic field and sound field, the calculating formula of target sound source reflects the relationship between sound source and conductivity, and the thermoacoustic signal generated by the coupling of magneto-thermal-acoustic field is detected and analyzed.Then the sound source distribution was reconstructed by time inversion method, the gel model containing 10% sodium chloride was placed in the pulse magnetic field with 渭 s pulse width, and the ultrasonic signal was collected by an ultrasonic transducer with a central frequency of 1 MHz.The peak value of the signal is about 4 MV after being amplified for 60 dB. The thermoacoustic images reconstructed by 100 sets of signals collected by rotating gel imitating body can reflect the conductivity distribution of the low conductivity gel imitating body.This experiment verifies the feasibility of using this method in low conductivity medium imaging, and provides a basis for the study of biological tissue imaging using this method.
【作者單位】： 中國(guó)科學(xué)院電工研究所;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家自然科學(xué)基金(51477161;61427806;51137004)~~
【分類(lèi)號(hào)】：TB559

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