Process for the reconstruction of three-dimensional images of an

Details Process for the reconstruction of three-dimensional images of an Process for the reconstruction of three-dimensional images of an

1993-05-21

1995-04-18

Dzierzynski, Paul M.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 25036302, A61B 603, G01N 23083

Patent

active

054085110

ABSTRACT:
Process for the reconstruction of three-dimensional images of an object (3), in which the reconstruction is obtained by calculating sums of projections on planes extracted from a conical attenuation radiation traversing the object, or an emission from the object in accordance with a conical collimation. The bidimensional detector array (4) used for this purpose has a random inclination (.xi.) with respect to the rotation axis defining the mark in which the image is reconstructed as a result of a voluntary choice. Formulas are given making it possible to obtain a limited distortion reconstruction after measuring the displacement parameters of the array and the conical radiation beam. The position errors resulting from construction defects are also taken into account in the calculations after measurement. A parameter measurement protocol and the associated calculation process are also described.

REFERENCES:
patent: 4672651 (1987-06-01), Horiba et al.
patent: 4752691 (1988-06-01), Hawman
patent: 4961208 (1990-10-01), Okada
patent: 5001347 (1991-03-01), Hsieh
patent: 5170439 (1992-12-01), Zeng et al.
patent: 5297035 (1994-03-01), Ichihara
Comparison of Two Three-Dimensional X-Ray Cone-Beam Reconstruction Algorithms With Circular Source Trajectories By: Grangeat et al, Optical Society of America vol. 8, No. 10, Oct. 1991, pp. 1639-1648.
Recentes Evolutions de la Tomographie 3D En Geometrie Conique By: Grangeat et al Treizieme Colloque sur le Traitement du Signal et des Images, Juan-les-Pins Du 16 AU 20 Sep. 1991 pp. 817-820.
Cone-Beam Tomography: Recent Advances and a Tutorial Review By: Bruce D. Smith, 2417 Optical Engineering 29 (1990) May No. 5, Bellingham, Wash. pp. 524-534.
CT Fan Beam Reconstruction With a Nonstationary Axis of Rotation By: Concepcion et al, 8197 IEEE Transactions on Medical Imaging 11 (1992) Mar., No. 1, NY, pp. 111-116.

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