A dual modality imaging system for impedance tomography with ultrasonically determined boundaries

Hardware and software for a dual modality imaging system is developed, and the system is applied to data obtained from phantoms. Static impedance tomographic images of translationally symmetric structures are reconstructed. For this purpose the positions of the electrodes placed around the cross section are determined by the ultrasonic time-of-flight measurements. The contrast resolution of the existing system is found to be 20% and the spatial resolution is about 10% of the average diameter of the cross section. In obtaining the impedance images, the 3-D nature of the data is taken into account by adapting a data conversion procedure. >