X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-05-27
2000-08-08
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 62, 378 982, A61B 603, G01N 2304
Patent
active
061012351
ABSTRACT:
The present invention, in one form, includes methods and apparatus for altering the spatial characteristics of a digital image collected in a CT system using a real-time magnification algorithm. In accordance with one embodiment of the algorithm, once the digital image is collected, an enlarged image is generated by interpolating and filtering the original digital image data. In one aspect, two pass linear interpolation and one dimensional filtering is utilized to generate the enlarged image. The first pass performs interpolation in the x direction and the second pass performs interpolation in the y direction. The interpolations in the x and y directions are performed in two steps. Initially, linear interpolation is applied to the original digital image to generate interpolated data. A one dimensional convolution filter is then applied to the interpolated data. Utilizing this process, a high quality enlarged image may be generated for any integer zoom factor. In another aspect of the present invention, a two step procedure of interpolation and two dimensional filtering is utilized. The first step performs bilinear interpolation of the digital image to generate interpolated data. The interpolated data is then filtered by a two dimensional convolution filter.
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Deaven David M.
Mussack Christopher J.
Zavaljevski Aleksandar
Bruce David V.
Cabou Christian G.
General Electric Company
Price Phyllis Y.
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