Method and system for masking cone beam projection data generate

Details Method and system for masking cone beam projection data generate Method and system for masking cone beam projection data generate

1994-12-27

1996-04-02

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

36441315, A61B 603

Patent

active

055047920

ABSTRACT:
The present invention discloses a method and system for performing three-dimensional computerized tomography imaging of a region of interest of an object. In the present invention, a scanning trajectory is provided about the object. The scanning trajectory includes a first scanning circle, a second scanning circle, and a helical scanning path connecting the first scanning circle and the second scanning circle. The scanning trajectory is then sampled with a plurality of cone beam source positions. Cone beam energy is emitted along the scanning trajectory from each of the plurality of cone beam source positions towards a portion of the object. Cone beam energy passing through the object is acquired on a detector as cone beam projection data. The cone beam projection data is then masked with a plurality of masks. Each of the masks remove cone beam projection data that is outside the region of interest of the object and retain cone beam projection data that is within the region of interest of the object. An image of the region of interest of the object is reconstructed from the masked cone beam projection data.

REFERENCES:
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patent: 5257183 (1993-10-01), Tam
patent: 5390111 (1995-02-01), Tam
patent: 5461650 (1995-10-01), Tam
"Image Reconstruction from Cone-Beam Projections: Necessary and Sufficient Conditions and Reconstruction Methods" by Bruce D. Smith, IEEE Trans on Medical Imaging, vol. MI-4, No. 1, Mar. 1985, pp. 14-25.
"Three-Dimensional Helical-Scan Computed Tomography Using Cone-Beam Projections", by Hiroyuki Kudo, et al, Systems and Computers in Japan, vol. 23, No. 12, 1992, pp. 75-82.
"Cone-Beam Tomography: Recent Advances and a Tutorial Review", by Bruce D. Smith, Optical Engineering, May 1990, vol. 29, No. 5, pp. 524-534.

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