Optical coherence tomography (OCT) determines the distances of scattering structures by interferometry in order to reconstruct A-scan and B-scan images of three-dimensional objects. In time domain OCT (TD-OCT) the intensity at the output of the interferometer is measured with a point detector, while the optical path length in one interferometer arm is changed . As an approach to avoid moving parts, linear OCT (L-OCT) employs a parallel detection scheme to measure the interference by introducing spatially varying path length differences on an array of individual detectors. According to Fig. 14.1 L-OCT is one of the four basic groups of OCT systems, which can be distinguished by the measured parameter (interference pattern or spectrum) and the type of acquisition (time-dependent point measurement or spatially multiplexed parallel measurement). TD-OCT and L-OCT measure an interference pattern, whereas spectral or Fourier domain OCT (FD-OCT) [2, 3] and swept source OCT (SS-OCT) [2,4], which is also named optical frequency domain imaging (OFDI), measure the cross-correlation spectrum, which is converted to the A-scan by a Fourier transform.
KeywordsOptical Coherence Tomography Interference Pattern Image Sensor Shot Noise Modulation Transfer Function
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