| 摘要 |
An imaging optical coherence tomography (OCT) apparatus with high transverse and high axial resolution comprises an interferometer of the Michelson, Mach-Zehnder or Kosters type. Light returning in the reference beam path ( 27 ) and the object beam path ( 26 ) interferes and is detected by an image sensor ( 28, 45 ) in the detection beam path ( 25 ). A single electromechanical linear scanner displaces the plane reference mirror ( 34, 51 ), the object imaging lens ( 33, 50 ), and the reference imaging lens ( 35, 52 ) along the optical axis. By providing identical lenses in the reference beam path ( 27 ) and in the object beam path ( 26 ), the geometrical displacement of the measurement focus in the object beam path ( 26 ) is equal to the change in optical length in the reference beam path ( 27 ), thus allowing dynamic coherent focus over the full scanning distance. All optical elements that must be replaced to obtain a different optical magnification can be arranged in an exchangeable cartridge ( 32, 49 ). The OCT image sensor ( 45 ) with its limited lateral resolution may be complemented by an additional high-resolution camera ( 57 ), which is observing the object through a beam splitter or a dichroic mirror in the detection beam path.
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