title: High-resolution, dual-depth spectral-domain optical coherence tomography with interlaced detection for whole-eye imaging.
abstract: Dual-depth spectral-domain optical coherence tomography (SD-OCT) enables high-resolution in vivo whole-eye imaging. Two orthogonally polarized beams from a source are focused simultaneously on two axial positions of the anterior segment and the retina. For the detector arm, a 1×2 ultrafast optical switch sequentially delivers two spectral interference signals to a single spectrometer, which extends the in-air axial depth range up to 9.44 mm. An off-pivot complex conjugate removal technique doubles the depth range for all anterior segment imaging. The graphics-processing-unit-based parallel signal processing algorithm supports fast two- and three-dimensional image displays. The obtained high-resolution anterior and retinal images are measured biometrically. The dual-depth SD-OCT system has an axial resolution of ∼6.4  μm in air, and the sensitivity is 91.79 dB at 150 μm from the zero-delay line.
authors.forename: Hyung-Jin
authors.initials: HJ
authors.lastname: Kim
authors.forename: Pil Un
authors.initials: PU
authors.lastname: Kim
authors.forename: Min Gyu
authors.initials: MG
authors.lastname: Hyeon
authors.forename: Youngwoon
authors.initials: Y
authors.lastname: Choi
authors.forename: Jeehyun
authors.initials: J
authors.lastname: Kim
authors.forename: Beop-Min
authors.initials: BM
authors.lastname: Kim
mesh_terms: D000465:Algorithms; D001699:Biometry; D005123:Eye / Q000000981:diagnostic imaging*; D006801:Humans; D021621:Imaging, Three-Dimensional; D012031:Refractometry; D012160:Retina; D012680:Sensitivity and Specificity; D041623:Tomography, Optical Coherence / Q000379:methods*