IMAGE-RECONSTRUCTION USING NON-ADJACENT DRIVE CONFIGURATIONS

The standard 'back projection' image reconstruction algorithm developed at Sheffield uses data obtained by passing current between adjacent pairs of electrodes and measuring voltage differences between the remaining pairs. Previously it has been argued that this configuration gives the best resolution compared to all other bipolar drive configurations. However, it also gives the worst signal to noise ratio data and it is possible that under conditions of poor signal to noise ratio it may be advantageous to use an alternative drive configuration, even at the expense of resolution. A general image reconstruction algorithm for any bipolar drive configuration has been produced. Reconstruction algorithms for the adjacent, cross (drive electrodes 90-degrees apart) and polar drive (drive electrodes 180-degrees apart) have been examined and compared in terms of their resolution and noise performance.