Specification and calibration of a multi-frequency MEIT system for stroke

摘要: The performance of a modified MEIT system was investigated, using resistor phantom, for the imaging stroke based on specifications revealed in recent modelling (Horesh et al, 2005). Using ideal calibration does not meet as variation over load is 0.9%, frequency +/-1.5% and electrode combinations +/-2% exceeding better than 1% requirement 20-500kHz 1 to 66 Ω. However this has been useful gastric emptying (Soulsby 2005); extending lower frequencies should aid application along with further epilepsy trials (Fabrizi Introduction Time difference available there usually no opportunity take reference image. Frequency one method that may be suitable; however, relies spectrally consistent EIT measurements different electrodes. Unfortunately, requirements image appear demanding detailed anatomical mesh head data from literature, they estimated an accuracy less range 10 Hz – 500 kHz <1-70 Ω required. In our group, we have developing system, module Sheffield Mark 3.5 (Wilson 2000), but cross point switch permit addressing up 64 electrodes (Yerworth 2003). However, human recordings encountered unexpected difficulties (Romsauerova al purpose work revisit ascertain if it met recently by precise modelling. Characterization achieved measurement phantom; evaluated loads frequencies.