Rotational distortion correction in endoscopic optical coherence tomography based on speckle decorrelation

Area of Science:

• Biomedical Optics
• Medical Imaging
• Catheter-based Imaging

Background:

• Nonuniform rotation distortion is a common artifact in catheter-based optical coherence tomography (OCT).
• Existing correction methods often rely on identifiable tissue features, limiting their applicability.
• Real-time correction is crucial for dynamic procedures like gastrointestinal examinations.

Purpose of the Study:

• To introduce a novel technique for correcting nonuniform rotation distortion in catheter-based OCT.
• To enable real-time image correction independent of specific tissue characteristics.
• To improve the image quality of gastrointestinal OCT imaging.

Main Methods:

• Utilizing the statistics of speckle between adjacent A-lines.
• Employing intensity-based dynamic light scattering for analysis.
• Implementing the technique on single OCT data frames for real-time processing.

Main Results:

• The technique accurately determines the actual rotational speed with high temporal resolution.
• Demonstrated effectiveness in a gastrointestinal balloon-catheter OCT system.
• Significantly enhanced image quality in both cross-sectional and en face views.

Conclusions:

• The presented speckle-based technique offers robust correction of rotational distortion in OCT.
• Real-time correction capability makes it suitable for dynamic intravascular and gastrointestinal applications.
• This method provides a significant advancement in OCT image quality and diagnostic utility.