Depth enhancement in spectral domain optical coherence tomography using bidirectional imaging modality with a single...

Area of Science:

• Biomedical Optics
• Medical Imaging Technology
• Optical Coherence Tomography

Background:

• Standard spectral domain optical coherence tomography (SD-OCT) faces limitations in imaging depth and resolution for certain biological and material samples.
• Characterizing deep morphological structures in samples with limited thickness remains a challenge in current OCT applications.

Purpose of the Study:

• To introduce and validate a bidirectional imaging modality for SD-OCT to enhance depth penetration and image characterization.
• To demonstrate the capability of the bidirectional SD-OCT system in visualizing deeper sample structures compared to conventional methods.

Main Methods:

• Development of a bidirectional SD-OCT system utilizing two aligned sample arms and two reference arms.
• Acquisition and analysis of images from various targets including optical resolution targets, Scotch tape, silicon sheets with needles, and a leaf.
• Validation through comparison with images obtained from a standard single-sample arm OCT configuration.

Main Results:

• The bidirectional SD-OCT method successfully increased the ability to characterize depth-enhanced images.
• Demonstrated improved visualization of deep morphological structures in exemplary samples.
• Validated results by comparing with standard single-sample arm OCT, showing advantages in depth-dependent fall-off mitigation.

Conclusions:

• The developed bidirectional SD-OCT imaging modality offers enhanced resolution and depth penetration.
• This technique is suitable for comprehensive cross-sectional imaging of entire samples, particularly those with limited thickness.
• The proposed method has significant potential to improve diagnostic capabilities in various applications.