Fig. 3: COIL imaging of objects using experimentally measured and simulated data.

SARA–COIL reconstructions are presented using either N_p = 121 or N_p = 1089 patterns, and either experimentally measured or simulated pattern and overlap data. The objects are an off-centre cross and four asymmetrically-positioned elliptical dots, micrographs of which are presented. The reconstructions are either 125 × 125 pixels in size for the N_p = 121 case, or 377 × 377 pixels in size for the N_p = 1089 case. Reconstructions using simulated patterns and overlap data for the N_p = 121 case used patterns generated from random orthonormal superpositions of the 121 lowest order modes of a circular ideal-mirror waveguide. For reconstructions using N_p = 1089, the object was rotated about the optical axis by 320° in steps of 40°, effectively creating a total of 121 × 9 patterns. The field of view of all reconstructions using experimentally measured data is 0.9 mm × 0.9 mm in the object plane.