Since OCT is completely noninvasive, it provides in vivo images without impacting the tissue that is imaged. Therefore it is especially valuable in organs, where traditional microscopic tissue diagnosis by means of biopsy is not available-such as the human eye. Which generates cross-sectional images of tissue with high resolution. Optical coherence tomography (OCT) is a non-contact imaging technique Recent approaches to improve the resolution and the acquisition speed show the ongoing research interest in OCT. New trends show the ability of functional OCT to image flow, polarizing properties of tissue and even mechanical properties like elasticity. Segmentation of features is the basis for automatic depth measurements and standardized measurements to be compared with normative databases. Combining retinal OCT with a confocal scanning laser ophthalmoscope allows for motion tracking during acquisition and to examine the exact same position at any time again. Regardless of the technical realization, axial resolution and imaging range of an OCT system are determined by light source and detector characteristics. Different technical methods are introduced and compared regarding their properties like sensitivity, imaging speed and penetration depth. A scanning OCT beam allows for acquisition of cross-sectional images of the tissue structure. The backscattered light is measured with an interferometric set-up to reconstruct the depth profile of the sample at the selected location. It typically uses light in the near-infrared spectral range which has a penetration depth of several hundred microns in tissue. Optical coherence tomography (OCT) is a non-invasive technique for cross-sectional tissue imaging.
0 Comments
Leave a Reply. |