X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1993-08-02
1995-08-29
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, 378 15, 36441316, 36441319, A61B 603, G01N 23083
Patent
active
054467764
ABSTRACT:
Computerized tomography provides three-dimensional imaging by applying cone beam energy to an object to be imaged. The energy passes through the object and is detected. The resulting cone beam data is efficiently processed to provide Radon data on polar grid points on a series of vertical planes. The Radon data is calculated by initially defining a Radon circle on each of the coaxial vertical planes. Radon derivative data is calculated at intersection points between the Radon circle and the radial lines. The values of Radon derivative data are binned according to the nearest grid point or nearest two grid points. Values are stored in the bins for each point in a particular plane until values for all of the planes have been supplied. The values for all the points are recalculated with each of a series of source positions, corresponding to the relative positioning of the source of cone beam energy and the object being imaged. Radon derivative data for each particular derivative point within each of the vertical planes is determined by averaging the Radon derivative data supplied to the bin corresponding to the particular point. After this is done for all of the derivative points, integration is performed along the radial lines corresponding to the grid points in order to give the Radon data R at each grid point. The image is then reconstructed based upon the performance of a three-dimensional inverse Radon transform on the Radon data.
REFERENCES:
patent: 4920491 (1990-04-01), Eberhard et al.
patent: 5032990 (1991-07-01), Eberhard et al.
patent: 5053958 (1991-10-01), Tam
patent: 5068882 (1991-11-01), Eberhard
patent: 5073910 (1991-12-01), Eberhard
patent: 5257183 (1993-10-01), Tam
patent: 5365560 (1994-11-01), Tam
patent: 5404293 (1995-04-01), Weng et al.
"An Inversion Formula for Cone-Beam Recopnstruction", by H. K. Tuy, Siam J. Appl. Math., vol. 43, No. 3, Jun. 1993, pp. 546-552.
"Convolutional Reconstruction From Cone-Beam Projection Data," by G. N. Minerbo, IEEE Transaction on Nuclear Science, vol. NS-26, No. 2, Apr. 1979, pp. 2682-2684.
"Practical Cone-Beam Algorithm", by Feldkamp et al., J. Opt. Soc. Am. A/vol. 1, No. 6, Jun. 194, pp. 612-619.
"Iterative Three-Dimensional Reconstruction from Twin-Cone Beam Projectsion", by M. Schlindwein, IEEE Transactions on Nuclear Science, vol. NS-25, No. 5, Oct. 1978, pp. 1135-1143.
"Cone-Beam Tomography: Recent Advances and a Tutorial Review", by B. D. Smith, Optical Engineering, vol. 29, No. 5, May 1990, pp. 524-534.
"Image reconstruction from Gone-Beam Projections: Necessary and Sufficient Conditions and Reconstruction Methods", by B. D. Smith, IEEE Transactions on Medical Imaging, vol. MI-4, No. 1, Mar. 1985, pp. 14-25.
"Quantitative Cone-Beam Reconstruction", by Hu et al., SPIE vol. 1092 Medical Imaging III: Image Processing (1989), pp. 492-501.
"Analysis of a 3D Imaging System by Reconstruction from X Radiographies in Conical Geometry", by Pierre Grangeat, Doctoral Thesis, pp. 1-303 No date.
Bruce David Vernon
General Electric Company
Porta David P.
Webb II Paul R.
LandOfFree
Tomography with generation of radon data on polar grid points does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tomography with generation of radon data on polar grid points, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tomography with generation of radon data on polar grid points will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1825693