Abstract
Catheter/endoscope-based optical coherence tomography (OCT) is a powerful modality that visualizes structural information in luminal organs. Increases in OCT speed have reduced motion artifacts by enabling acquisition faster than or comparable to the time scales of physiological motion. However motion distortion remains a challenge because catheter/endoscope OCT imaging involves both circumferential and longitudinal scanning of tissue. This paper presents a novel image processing method to estimate and correct motion distortion in both the circumferential and longitudinal directions using a single en face image from a volumetric data set. The circumferential motion distortion is estimated and corrected using the en face image. Then longitudinal motion distortion is estimated and corrected using diversity of image features along the catheter pullback direction. Finally, the OCT volume is resampled and motion corrected. Results are presented on synthetic images and clinical OCT images of the human esophagus.
Highlights
Catheter/endoscope-based optical coherence tomography (OCT) is a powerful imaging modality capable of capturing depth-resolved tissue features in luminal organs
This paper presents a new method to estimate and correct motion distortion in catheter/endoscopebased OCT
The algorithm begins with OCT pre-processing to generate the OCT volume from raw fringes and correct for non-uniform rotational distortion (NURD) using fiducial markers on the probe housing
Summary
Catheter/endoscope-based optical coherence tomography (OCT) is a powerful imaging modality capable of capturing depth-resolved tissue features in luminal organs. Since the development of the first catheter-based OCT probe more than 20 years ago [1], many variations of scanning probes have been developed. These scanning probes consist of micro-optics to deflect and focus light onto the tissue and beam scanning mechanisms which can acquire cross sectional or volumetric OCT data. Side-viewing probes are more popular for imaging luminal organs and can be further divided based on the type of scanning mechanism (proximal or distal). Distal scanning probes [17,18,19,20] use micro-motors at their tip for circumferential beam scanning. We limit our attention to motion distortion associated with side-viewing probes
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