Multi-MHz retinal OCT
作者： Thomas Klein , Wolfgang Wieser , Lukas Reznicek , Aljoscha Neubauer , Anselm Kampik
DOI: 10.1364/BOE.4.001890
关键词: Optics 、 Laser 、 Coherence (signal processing) 、 Sampling (signal processing) 、 Image quality 、 Optical coherence tomography 、 Fiber Bragg grating 、 Optical cavity 、 Adaptive optics 、 Materials science
摘要: We analyze the benefits and problems of in vivo optical coherence tomography (OCT) imaging human retina at A-scan rates excess 1 MHz, using a 1050 nm Fourier-domain mode-locked (FDML) laser. Different scanning strategies enabled by MHz OCT line are investigated, simple multi-volume data processing approach is presented. In-vivo ocular fundus performed different axial scan up to 6.7 MHz. High quality non-mydriatic retinal over an ultra-wide field achieved combination several key improvements compared previous setups. For FDML laser, long lengths 72 wavelength tuning range chirped fiber Bragg grating laser cavity 419.1 kHz fundamental rate. Very large sets can be acquired with sustained transfer from acquisition card host computer memory, enabling high-quality averaging many frames multiple aligned sets. Three modes investigated: Alignment 24 1.68 rate, ultra-dense transverse sampling 3.35 dual-beam two spots on effective rate
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