IMAGE-RECONSTRUCTION USING NON-ADJACENT DRIVE CONFIGURATIONS

The standard 'back projection' image reconstruction algorithm develope d at Sheffield uses data obtained by passing current between adjacent pairs of electrodes and measuring voltage differences between the rema ining pairs. Previously it has been argued that this configuration giv es the best resolution compared to all other bipolar drive configurati ons. However, it also gives the worst signal to noise ratio data and i t is possible that under conditions of poor signal to noise ratio it m ay be advantageous to use an alternative drive configuration, even at the expense of resolution. A general image reconstruction algorithm fo r any bipolar drive configuration has been produced. Reconstruction al gorithms for the adjacent, cross (drive electrodes 90-degrees apart) a nd polar drive (drive electrodes 180-degrees apart) have been examined and compared in terms of their resolution and noise performance.