TOMOGRAPHIC IMAGE GENERATION DEVICE AND METHOD, AND RECORDING MEDIUM
First Claim
1. A tomographic image generation device comprising:
- an image obtaining unit for obtaining a plurality of projection images corresponding to different radiation source positions, the projection images being taken by moving a radiation source relative to a detecting unit and applying radiation to a subject from the different radiation source positions to which the radiation source is moved;
a pixel value projecting unit for projecting pixel values of the projection images on coordinate positions on a desired slice plane of the subject based on a positional relationship between the radiation source position with which each of the projection images is taken and the detecting unit, while preserving the pixel values of the projection images, to obtain slice plane projection images corresponding to the individual projection images;
a positional misalignment correcting unit for correcting positional misalignment between the slice plane projection images; and
a pixel value calculating unit for calculating a pixel value of each coordinate position of interest on the slice plane from the slice plane projection images having been subjected to the correction of the positional misalignment to thereby generate a tomographic image of the slice plane.
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Accused Products
Abstract
An image obtaining unit obtains a plurality of projection images by imaging a subject with different radiation source positions. A pixel value projecting unit projects pixel values of the projection images on coordinate positions on a desired slice plane of the subject based on the positional relationship between the radiation source position with which each projection image is taken and the radiation detector, while preserving pixel values of the projection images, to obtain a plurality of slice plane projection images. A positional misalignment correcting unit corrects positional misalignment between the slice plane projection images. A pixel value calculating unit generates a tomographic image from the slice plane projection images having been subjected to the correction of the positional misalignment.
14 Citations
26 Claims
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1. A tomographic image generation device comprising:
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an image obtaining unit for obtaining a plurality of projection images corresponding to different radiation source positions, the projection images being taken by moving a radiation source relative to a detecting unit and applying radiation to a subject from the different radiation source positions to which the radiation source is moved; a pixel value projecting unit for projecting pixel values of the projection images on coordinate positions on a desired slice plane of the subject based on a positional relationship between the radiation source position with which each of the projection images is taken and the detecting unit, while preserving the pixel values of the projection images, to obtain slice plane projection images corresponding to the individual projection images; a positional misalignment correcting unit for correcting positional misalignment between the slice plane projection images; and a pixel value calculating unit for calculating a pixel value of each coordinate position of interest on the slice plane from the slice plane projection images having been subjected to the correction of the positional misalignment to thereby generate a tomographic image of the slice plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A tomographic image generation method comprising the steps of:
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obtaining a plurality of projection images corresponding to different radiation source positions, the projection images being taken by moving a radiation source relative to a detecting unit and applying radiation to a subject from the different radiation source positions to which the radiation source is moved; projecting pixel values of the projection images on coordinate positions on a desired slice plane of the subject based on a positional relationship between the radiation source position with which each of the projection images is taken and the detecting unit, while preserving the pixel values of the projection images, to obtain slice plane projection images corresponding to the individual projection images; correcting positional misalignment between the slice plane projection images; and calculating a pixel value of each coordinate position of interest on the slice plane from the slice plane projection images having been subjected to the correction of the positional misalignment to thereby generate a tomographic image of the slice plane.
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26. A non-transitory recording medium containing a tomographic image generation program for causing a computer to execute the steps of:
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obtaining a plurality of projection images corresponding to different radiation source positions, the projection images being taken by moving a radiation source relative to a detecting unit and applying radiation to a subject from the different radiation source positions to which the radiation source is moved; projecting pixel values of the projection images on coordinate positions on a desired slice plane of the subject based on a positional relationship between the radiation source position with which each of the projection images is taken and the detecting unit, while preserving the pixel values of the projection images, to obtain slice plane projection images corresponding to the individual projection images; correcting positional misalignment between the slice plane projection images; and calculating a pixel value of each coordinate position of interest on the slice plane from the slice plane projection images having been subjected to the correction of the positional misalignment to thereby generate a tomographic image of the slice plane.
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Specification