X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1996-11-27
1998-09-01
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, A61B 603
Patent
active
058021337
ABSTRACT:
A method of X-ray computerized tomography whereby a scanner in which an X-ray source for irradiating an X-ray in a cone-beam shape to an object and a two-dimensional detector for detecting the X-ray transmitted through the object are installed is rotated around the object and a projection angle is changed and a distribution of X-ray attenuation coefficients of the object is reconstructed from the transmitted X-ray images obtained at a plurality of projection angles. This method has the steps of: (1) measuring a first transmitted X-ray image measured in a state in which a contrast medium is injected into the object, a second transmitted X-ray image measured in a state in which no contrast medium is injected into the object, and a third transmitted X-ray image measured in a state in which no object is positioned in the apparatus; (2) calculating a first projection image from a difference between logarithms of the first and second transmitted X-ray images obtained at the same projection angle, calculating a second projection image from a difference between logarithms of the second and third transmitted X-ray images obtained at the same projection angle, and simultaneously reconstructing a first reconstructed image from the first projection image and a second reconstructed image from the second projection image in parallel; and (3) composing the first and second reconstructed images, thereby forming a composed image.
REFERENCES:
patent: 4672651 (1987-06-01), Horiba et al.
patent: 5383231 (1995-01-01), Yamagishi
"Practical cone-beam algorithm", L.A., Feldkamp et al, Optical Society of America, vol. 1, No. 6, 1984, pp.612-619.
"Effects of scattered x-rays on cone-beam 3-D CT images ", Magazine of The Institute of Medical Image Information, vol. 12, No. 12, 1995.
"Effects of Scattered X-rays on cone-beam 3-D CT images ", SPIC vol. 2163, Phys. of Med. Image, 1994, p. 184.
"Three-Dimensional Imaging-Cone-Beam 3D CT", T. Saito, Med. Imag. Tech. vol. 13, No. 3, May 1995, p. 183.
Kawai Hiroyuki
Sekihara Kensuke
Bruce David Vernen
Hitachi Medical Corporation
Porta David P.
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