TY - GEN
T1 - Microendoscopic holography with flexible fiber bundle
AU - Coquoz, Olivier
AU - Depeursinge, Christian D.
AU - Conde, Ramiro
AU - Haller, Emmanuel B.
PY - 1994
Y1 - 1994
N2 - An in situ holographic technique, involving the use of a flexible miniaturized endoscope (diameter less than 1 mm) coupled to a CCD camera, to record the hologram, has been developed for medical applications. The hologram is formed, by reflection, on the tip of a multimode fiber bundle (MMB), sampled, and then treated electronically. The image is reconstructed numerically, providing more flexibility to the holographic process. Reconstructed images show the capability of the microendoscopic system to restore 3D informations of the observed scene. The limitations of the holographic approach with the microendoscope have been evaluated and discussed in terms of the resolution limit. In particular, the low frequency sampling of the hologram through the MMB is not a limiting factor for the range of observation distance investigated (4 - 10 mm). A good accordance between the experimental results and the theoretical predictions was found by comparing the cut-off frequency obtained. Our results show that, for the considered observation distances, objects of a few micrometers can be clearly identified. The different sources of noise are analyzed and their influence on the quality of the reconstructed image have been quantified.
AB - An in situ holographic technique, involving the use of a flexible miniaturized endoscope (diameter less than 1 mm) coupled to a CCD camera, to record the hologram, has been developed for medical applications. The hologram is formed, by reflection, on the tip of a multimode fiber bundle (MMB), sampled, and then treated electronically. The image is reconstructed numerically, providing more flexibility to the holographic process. Reconstructed images show the capability of the microendoscopic system to restore 3D informations of the observed scene. The limitations of the holographic approach with the microendoscope have been evaluated and discussed in terms of the resolution limit. In particular, the low frequency sampling of the hologram through the MMB is not a limiting factor for the range of observation distance investigated (4 - 10 mm). A good accordance between the experimental results and the theoretical predictions was found by comparing the cut-off frequency obtained. Our results show that, for the considered observation distances, objects of a few micrometers can be clearly identified. The different sources of noise are analyzed and their influence on the quality of the reconstructed image have been quantified.
UR - http://www.scopus.com/inward/record.url?scp=0028750907&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:0028750907
SN - 0819414271
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 466
EP - 474
BT - Proceedings of SPIE - The International Society for Optical Engineering
A2 - Cerullo, Leonard J.
A2 - Heiferman, Kenneth S.
A2 - Liu, Hong
A2 - Podbielska, Halina
A2 - Wist, Abund O.
PB - Publ by Society of Photo-Optical Instrumentation Engineers
T2 - Clinical Applications of Modern Imaging Technology II
Y2 - 23 January 1994 through 23 January 1994
ER -