The ,,Spectral Radar" is an optical sensor for tomography, working in the Fourier domain, rather than in time domain. The scattering amplitude a(z) along one vertical axis from the surface into the bulk can be measured within one exposure. No reference arm scanning is necessary. One important property of optical coherence tomography (OCT) sensors is the dynamic range. We will compare the dynamic range of the spectral radar with standard OCT. The influence of the Fourier transformation on the dynamic range of the Spectral Radar will be discussed. The dinical relevance of the in vivo measurements will be demonstrated.
Spectral radar" combines a white light interferometer with a spectrometer. It is an optical sensor for the acquisition of skin morphology based on OCT techniques. The scattering amplitude along one vertical axis from the surface into the bulk can be measured within one exposure. We will discuss some essentials of signal formation and a new method of signal evaluation that significantly reduces artifacts from some source imperfections. We will further demonstrate new measurements.
Important aims in dermatology are the measurement of pathological alterations of human skin and on the other hand the quantification ofthe influences caused by pharmaceutic and cosmetic products. We present modifications of the well established coherence radar that allow in vivo measurements of human skin in spite of involuntary body movements and bloodflow. The measuring field can be varied from 100 x 100 im2 to 5 x 5 mm2. The measuring time is 5 to 15 s and the longitudinal measuring uncertainty is about 2 m. A fiberoptical implementation allows the separation ofthe sensor head from the mechanical scan. The mobile and compact sensor head can now be freely positioned and adjusted to each part of the patients skin. Disturbances caused by unavoidable movement of the patient can be compensated by modified setups of the coherence radar. We show measurements of clinical and cosmetical relevance.
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