首页|A comparison of cross-correlation-based and phase-correlation-based image registration algorithms for optical coherence tomographic angiography
A comparison of cross-correlation-based and phase-correlation-based image registration algorithms for optical coherence tomographic angiography
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A large field of view is in high demand for disease diagnosis in clinical applications of optical coherence tomography[OCT]and OCT angiography[OCTA]imaging.Due to limits on the optical scanning range,the scanning speed,or the data process-ing speed,only a relatively small region could be acquired and processed for most of the current clinical OCT systems at one time and could generate a mosaic image of multiple adjacent small-region images with registration algorithms for disease analysis.In this work,we investigated performing cross-correlation[instead of phase-correlation]in the workflow of the Fourier-Mellin transform[FMT]method[called dual-cross-correlation-based translation and rotation registration,DCCTRR]for calculating translation and orientation offsets and compared its performance to the FMT method used on OCTA images alignment.Both phantom and in vivo experiments were implemented for comparisons,and the results quantitatively dem-onstrate that DCCTRR can align OCTA images with a lower overlap rate,which could improve the scanning efficiency of large-scale imaging in clinical applications.
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