X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-04-02
2000-02-15
Bruce, David Vernon
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, 378901, A61B 603
Patent
active
060261420
ABSTRACT:
A system and method extracts object boundaries in computed tomography images that have been corrupted by noise. The system and method find object boundaries in tomography images by finding edges in sinogram data, thereby providing a segmentation method that is insensitive to the image noise introduced by the process of image reconstruction from projections. The boundary-detection system uses projection data, and optionally tomographic image data, to detect the boundaries of objects in tomographic images. The system is of particular value for boundary-detection in images corrupted by reconstruction artifacts, such as CT scans of hospital patients who have implanted metal prostheses. The system is applicable to recovering the boundaries of convex objects, and the convex segments of the boundaries of concave objects (though not the complete boundaries of the concave objects themselves). The system is clinically viable in the sense that this method can be embodied in a practical, real-world system that can be used routinely in hospitals and medical clinics, and relies only on data that are available from standard medical CT scanners, that is the CT images and scout images (and not the original sinogram data).
REFERENCES:
patent: 4888693 (1989-12-01), Tam
Gueziec Andre P.
Kalvin Alan David
Bruce David Vernon
International Business Machines - Corporation
Percello Louis J.
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