X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1997-08-18
1999-09-14
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, A61B 603
Patent
active
059533889
ABSTRACT:
An algorithm is created and applied to reconstruct the wavelet coefficients of an image from the Radon transform data for use in computed tomography, with a disclosed method that uses the properties of wavelets to localize the Radon transform such that a local region of the cross section of a body can be reconstructed using almost completely local data to significantly reduce the amount of exposure and computations in X-ray tomography. The described algorithm is based on the observation that for some wavelet bases with sufficiently many vanishing moments, the ramp-filtered version of the scaling function as well as the wavelet function has extremely rapid decay, with the variance of the elements of the nullspace is being negligible in the locally reconstructed image.
REFERENCES:
patent: 4044260 (1977-08-01), Hounsfield
patent: 5576548 (1996-11-01), Clarke et al.
Berenstein Carlos Alberto
Liu K. J. Ray
Rashid-Farrokhi Farrokh
Walnut David Francis
Bruce David Vernon
George Mason University
Porta David P.
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