Method for suppressing the mirror image in Fourier-domain optical coherence tomography

Area of Science:

• Biomedical Optics
• Medical Imaging Technology
• Optical Metrology

Background:

• Fourier-domain optical coherence tomography (FD-OCT) is a powerful imaging technique.
• Mirror image artifacts degrade the quality and accuracy of FD-OCT images.
• Existing methods for mirror image suppression can be time-consuming or inflexible.

Purpose of the Study:

• To demonstrate a novel method for effective mirror image suppression in FD-OCT.
• To improve image quality and diagnostic reliability in FD-OCT.
• To offer a more efficient and flexible alternative to current suppression techniques.

Main Methods:

• A phase shift is introduced between neighboring A-mode scans.
• Real and mirror image phase shifts are exploited, being mutually reversed.
• A set of two coupled equations is solved to isolate real image signals.
• A high-resolution spectral-domain OCT system was used for demonstration.

Main Results:

• Effective suppression of mirror image artifacts was achieved.
• The proposed method demonstrated superior performance compared to a similar, broadly applied method.
• The new approach offers a shorter processing time.
• Enhanced flexibility in selecting image portions for processing was observed.

Conclusions:

• The demonstrated phase shift method provides effective mirror image suppression in FD-OCT.
• This technique enhances image clarity and reliability.
• The method presents advantages in processing speed and flexibility, making it a valuable tool for FD-OCT applications.