Feature Of The Week 4/1/12: Russian Institute of Applied Physics Investigates Digital Refocusing in Optical Coherence Tomography Systems
Over the past few years using electronic post optical detection processing to create a synthetic receiver field-of-view has become a very promising technique for offering improved performance in biomedical optical imaging systems. Various approaches around this basic theme have been used in OCT and non-OCT systems such as synthetic aperture radar, digital holography, and other microscopy techniques. The approach not only allows for improving the classic depth-of-focus vs lateral resolution tradeoff in OCT systems but offers other promising performance enhancement such as eliminating the need for deformable mirrors in adaptive optics ophthalmic imaging and application benefits in other fields such as gastroenterology, cardiology, and microscopy. Recently a leading OCT group at the Institute of Applied Physics of the Russian Academy of Sciences published an interesting article on "Digital refocusing in optical coherence tomography". Below is a summary of their work.
The problem of restoration Optical Coherence Tomography (OCT) images, acquired with tightly focused probing beam, in out-of-focus region for improving lateral resolution of the OCT has been considered. Phase stability issue has been discussed and phase equalization algorithm has been proposed. After phase equalization, the algorithm of digital refocusing, based on some methods from the DH, have been applied to the simulated as well as to experimental OCT data, acquired with tightly focused scanning beam to restore micrometer lateral resolution in the whole investigated volume.
For more information see recent Article. Courtesy Valentin Gelikonov.