Laser beam optical CT scanner for in-air gel readout: imaging artefacts

摘要

Ongoing progress on development of an in-air scanning optical CT is reported, specifically dealing with the minimization of scanner imaging artefacts. Improved scratch resistance of the PMMA gel cylinder was a primary goal, so that routine cleaning would not degrade the polished surfaces. This was achieved by the addition of a hard coating to the cylinder surfaces. New artefacts were introduced and subsequently reduced by alternative processing of projection data. The outcome was a gel cylinder of much greater practicality for routine use while maintaining similar signal to noise ratios and uniformity in the image reconstruction field of view.