1.4 Mhz Ultra High-speed Ultra Wide-field Swept Source Oct

Abstract

 

Purpose:

 

To investigate 1.4 MHz ultra high-speed ultra wide-field swept source Fourier domain mode locking (FDML) OCT regarding feasibility and its image quality.

 

Methods:

 

A 1050nm swept source FDML OCT was constructed running at 1.4 MHz A-scan rate, which covers approx. 70° field of view. Imaging of normal eyes was performed with the device using 1900x1900 A-scans in approx. 3 seconds. Image results were compared with Spectralis OCT (Heidelberg Engineering, Germany) image quality of the same eyes.

 

Results:

 

The images of 11 normal eyes obtained at an A-scan rate of 1.4 MHz covered a wide field of view, including the complete macula and optic disc. The image quality of the raw OCT scans showed reasonable - but lower - quality versus the processed Heidelberg scans. When averaging 5 scans in X-Y direction, an image quality more comparable to Heidelberg scans was obtained at 1.4 MHz, while yielding an orders of magnitude higher number of 3D data points.

 

Conclusions:

 

3D OCT at 1.4 MHz is feasible by swept source FDML OCT and offers high data density at still reasonable OCT image quality.  

 

Keywords: imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • image processing • imaging/image analysis: clinical