X-ray or gamma ray systems or devices – Specific application – Tomography
Reexamination Certificate
2006-08-07
2009-02-10
Song, Hoon (Department: 2882)
X-ray or gamma ray systems or devices
Specific application
Tomography
C378S062000
Reexamination Certificate
active
07489759
ABSTRACT:
Method and apparatus for X-ray imaging of a body, employing a support to receive a body to be examined, a source emitting a beam of X-rays, a detector irradiated by the beam, a converter for converting the detected intensities into data, a means for turning the mounted mobile support by an angle of rotation about an axis of rotation with respect to the source and the detector and a suitably programmed computer to average the data acquired for a pair of orthogonal angles of rotation to obtain n column and m line mean values for n and m elementary segments of a band of the detector, to construct an initial image (n, m) with the n column and m line mean values, to adjust the coefficient of attenuation in each n×m elementary zone by a method of least squares taking into account the n column and m line mean values regarded as constraints, to repeat the previous stages for data acquired with different pairs of preferably orthogonal angles of rotation, and to average term by term the adjusted images so as to arrive at a synthesis image expressing coefficients of attenuation of the examined body.
REFERENCES:
patent: 3924131 (1975-12-01), Hounsfield
patent: 4412289 (1983-10-01), Yamaguchi
patent: 5414623 (1995-05-01), Lu
patent: 6173034 (2001-01-01), Chao
10 pages entitled Albebraic Reconstruction Techniques Can Be Made Computationally Efficient . . . etc. by Gabor T. Herman et al dated Sep. 1, 1993—pp. 600-609.
16 pages entitled “A Tutorial on Art” by Richard Gordon—dated Jun. 3, 1974, pp. 78-93.
Song Hoon
Sturm & Fix LLP
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