publications by Joseph A. Izatt.


Papers Published

  1. Choma, M.A. and Yazdanfar, S. and Izatt, J.A., Wavelet and eigenfrequency spectral analysis of color Doppler optical coherence tomography, Proc. SPIE - Int. Soc. Opt. Eng. (USA), vol. 4956 (2003), pp. 329 - 32 [12.479040] .
    (last updated on 2007/04/13)

    Abstract:
    Optical coherence tomography (OCT) is a depth-resolved imaging modality that uses low coherence interferometry to gate the time-of-flight of backreflected sample light. The heterodyne frequency of the interferometric signal can be up- or downshifted by reflection off of a moving particle (e.g. red blood cells in an artery). This Doppler shift can be resolved with a time-frequency decomposition (TFD) and displayed as a color Doppler-OCT image. Here we compare the in vitro and in vivo performance of three TFDs: the short-time Fourier transform, the Morlet wavelet transform, and the short-time MUSIC transform (STMT). The STMT is a new TFD that incorporates the MUSIC eigenfrequency estimator in a generalized short-time framework. The Morlet transform excels at identifying blood vessels, while the STMT is the most accurate predictor of Doppler shift frequency

    Keywords:
    biomedical optical imaging;blood flow measurement;blood vessels;Doppler measurement;Fourier transforms;image colour analysis;medical image processing;optical tomography;spectral analysis;time-frequency analysis;wavelet transforms;