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Proceedings Paper

Summary Of Chrono-Coherent Imaging In Medicine
Author(s): Kenneth G. Spears; Jenifer Serafin; Xinming Zhu; Hans Bjelkhagen
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Paper Abstract

We describe demonstration experiments for a new method of medical diagnostic imaging. The method is called Chrono-Coherent Imaging (CCI) and it can be used in a transmission geometry to form images in the presence of overwhelming scattered light, which blocks conventional image formation. Future applications are for imaging inside the human body where tissue light scattering normally obscures image formation. In a transmission geometry the scattered light will take different time delays to reach a recording medium than will the very weak unscattered light which contains image information. The recording of the image for a series of times is not done as a real image with ultrashort gating devices such as streak cameras or Kerr shutters, but the recording is done coherently like a hologram with the sub-picosecond coherence properties of the laser pulse. By using a time sweep of a reference laser beam on the recording medium, similar to Light-In-Flight Holography, we can make a series of coherent images with a single laser exposure, even in the presence of very large incoherent exposure by the scattered light. These images are much like an X-ray in that cumulati've transmission effects are recorded throughout the object, but in CCI the time series of images has both refractive index and absorption information. Many other features such as tissue selectivity by wavelength tuning, depth enhancement and three dimensional image reconstruction are possible with the new imaging method of CCI.

Paper Details

Date Published: 1 May 1989
PDF: 6 pages
Proc. SPIE 1090, Medical Imaging III: Image Formation, (1 May 1989); doi: 10.1117/12.953187
Show Author Affiliations
Kenneth G. Spears, Northwestern University (United States)
Jenifer Serafin, Northwestern University (United States)
Xinming Zhu, Northwestern University (United States)
Hans Bjelkhagen, Northwestern University (United States)

Published in SPIE Proceedings Vol. 1090:
Medical Imaging III: Image Formation
Samuel J. Dwyer; R. Gilbert Jost; Roger H. Schneider, Editor(s)

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