高精度一体化电阻抗断层成像数据采集系统

High precision integrated data collection in electrical impedance tomography

目的设计一种高精度一体化电阻抗断层成像数据采集系统。方法根据乳腺EIT检测方法的特点,设计了一套16电极高精度一体化实验系统,包括电极、开关阵列、模拟前端、模数转换及数据传送等。系统采用了24位高精度A/D转换和数据采集系统芯片ADuC834,使用了环形电路板,将所有电路集中在该电路板上,以16个压力测试针作为与外部电极的接合点,实现了无长引线的一体化系统。结果使用该系统进行了初步成像实验,取得了较好的成像结果。结论从成像结果看,采用高精度一体化数据采集系统进行EIT成像是可行的,新系统有更高的测量精度。

Objective To develop a high precision integrated data collection system for electrical impedence tomography（EIT）. Methods A data collection system was designed and an integrated prototype of breast EIT was developed, which was composed of 16 electrodes,a switch array with multiplexers in a parallel structure, an analogue amplifier,a 24 bit high precision A/D converter and data transmission system. The integrated prototype had no long electrode cables,only consisted 16 elastic needles as the connective points to the outer object,real full data collect chip, and an annular PCB board for integrating all circuits. Results Some preliminary experiments of EIT image were performed and the results were satisfactory. Conclusion The resulted EIT image showed that the new integrated data collection system works effectively and efficiently with high precision.