Cheon Gyeong Woo, Gehlbach Peter L, Kang Jin U
Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, MD, USA.
Wilmer Eye Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA.
IEEE Photonics Technol Lett. 2016 Sep 15;28(18):1972-1975. doi: 10.1109/LPT.2016.2580588. Epub 2016 Jun 14.
We propose, test and validate a novel Fourier-domain based method for ghost image artifacts reduction in a common-path SSOCT system having multiple adjacent reference planes. Common-path probes with imaging systems containing high-index sapphire ball or other lenses produce multiple fixed references due to Fresnel reflections from the lens surfaces. The multiple reference planes produce multiple and overlapping OCT images. Since such ghost artifacts are the result of the superposition of multiple identical images having different amplitudes and spatial shifts, one can correctly shift and sum the images in the Fourier-domain once the relative amplitude and lateral position between the reference planes are known. This theory and numerical testing are presented to elucidate our method. We then validate the potential effectiveness using OCT imaging experiments.
我们提出、测试并验证了一种基于傅里叶域的新方法，用于在具有多个相邻参考平面的共光路SSOCT系统中减少重影图像伪影。包含高折射率蓝宝石球或其他透镜的成像系统的共光路探头，由于透镜表面的菲涅耳反射会产生多个固定参考。多个参考平面会产生多个重叠的OCT图像。由于这种重影伪像是具有不同幅度和空间偏移的多个相同图像叠加的结果，一旦知道参考平面之间的相对幅度和横向位置，就可以在傅里叶域中正确地对图像进行移位和求和。本文阐述了这一理论和数值测试。然后，我们通过OCT成像实验验证了该方法的潜在有效性。
