【摘要】：探究三維電阻抗成像系統(tǒng)電極結(jié)構(gòu)對數(shù)據(jù)測量及圖像重建的影響�？紤]到電極形狀和電極在邊界上的分布狀態(tài)對成像效果的影響,在構(gòu)建的3D電阻抗系統(tǒng)模型及層間準(zhǔn)對角激勵相鄰(QBD)測量工作模式下,對方形電極(I型)、圓形電極(II型)、同心圓復(fù)合電極(III型)和方圓復(fù)合電極(IV型)4種形狀電極,就0.2到0.7之間8種不同電極占空比(DR)情況進行對比研究。采用重建圖像的相關(guān)度R,敏感場的靈敏度均勻性P,測量電壓動態(tài)范圍D進行評價。對比結(jié)果表明,在DR為0.4~0.5之間,4種電極結(jié)構(gòu)下的圖像相關(guān)度R均優(yōu)于其他DR情況,而且IV型電極的R和P指標(biāo)略優(yōu)于I~III型,但復(fù)合型電極(III和IV型)在DR為0.3和0.35時邊界測量電壓動態(tài)范圍D偏大,穩(wěn)定性差。對三維場域中5個高度不等(7.5~30 cm之間)、電導(dǎo)率相同的物體,采用共軛梯度算法進行圖像重建。數(shù)據(jù)經(jīng)歸一化處理,截取2個電極層、1個電極間層及2個電極外層共5個等間隔的不同斷層圖像進行對比,4種電極模型下的成像結(jié)果均與真實分布相吻合,IV型電極所成圖像偽影略小,效果較好,與指標(biāo)評價結(jié)果一致。本研究為QBD模式的三維電阻抗成像系統(tǒng)確定了電極形狀及電極分布,為進一步研究三維空間的電阻抗分布奠定基礎(chǔ)。
[Abstract]:To explore the effect of electrode structure on data measurement and image reconstruction in three dimensional electrical impedance imaging system. Considering the influence of electrode shape and electrode distribution on the imaging effect, the 3D impedance system model and the adjacent (QBD) measurement mode with quasi-diagonal excitation between layers are constructed. Four kinds of shaped electrodes, I. e., I type, II type, III type and IV type, were compared and studied. Eight different duty cycle ratios (DR) were compared between 0. 2 and 0. 7. The correlation degree of the reconstructed image and the sensitivity uniformity of the sensitive field are used to evaluate the dynamic range D of the voltage. The results show that the image correlation R of the four electrode structures is better than that of other DR, and the R and P indexes of IV type electrode are slightly better than that of I~III type electrode. However, the boundary voltage dynamic range D is larger and the stability is poor when the composite electrode (III and IV type) is 0.3 and 0.35 DR. The conjugate gradient algorithm is used to reconstruct five objects with the same conductivity and different heights (between 7.5 cm and 30 cm) in 3D field domain. The data is normalized, Two electrode layers, one interelectrode layer and two electrode outer layers with 5 equal intervals were intercepted and compared. The imaging results of the four kinds of electrode models were all consistent with the true distribution. The image artifacts of the IV type electrode were slightly smaller and the effect was better. It is consistent with the result of index evaluation. In this paper, the electrode shape and electrode distribution are determined for the three-dimensional electrical impedance imaging system of QBD mode, which lays a foundation for the further study of the electrical impedance distribution in three-dimensional space.
【作者單位】： 天津科技大學(xué)電子信息與自動化學(xué)院;中國民航大學(xué)航空自動化學(xué)院;
【基金】：國家自然科學(xué)基金重點項目(50937005) 天津市科委自然科學(xué)基金(12JCYBJC19500)
【分類號】：R318.6

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5 孫r囋，

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