Tomographic image obtainment apparatus and method
DCFirst Claim
1. A tomographic image obtainment apparatus, wherein a tomographic image is reconstructed from a plurality of radiographic images obtained by irradiating a subject with radiation from various directions, the apparatus comprising:
- a radiation image detector for obtaining radiographic images of the subject;
a radiation irradiation unit placed so as to face the radiation image detector, the radiation irradiation unit moving to a plurality of positions and irradiating, at the plurality of positions, the subject placed on the radiation image detector with radiation from various directions;
an overlap-degree obtainment means for obtaining the degree of overlap of anatomical structures of the subject; and
an exposure condition setting means for setting, based on the degree of overlap obtained by the overlap-degree obtainment means, a condition of exposure by the radiation irradiation unit at the plurality of positions to obtain the plurality of radiographic images.
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Abstract
When radiographic images are obtained by radiography using a tomographic image obtainment apparatus, the degree of overlap of anatomical structures of a subject is obtained. Further, a condition of exposure, such as angles θ of radiography, is changed based on the degree of overlap. The angles θ of radiography are angles at which a radiation irradiation unit performs radiography at a plurality of positions to obtain a plurality of radiographic images. The tomographic image obtainment apparatus produces a tomographic image by reconstructing the tomographic image from a plurality of radiographic images obtained by irradiating the subject with radiation from various directions.
36 Citations
9 Claims
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1. A tomographic image obtainment apparatus, wherein a tomographic image is reconstructed from a plurality of radiographic images obtained by irradiating a subject with radiation from various directions, the apparatus comprising:
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a radiation image detector for obtaining radiographic images of the subject; a radiation irradiation unit placed so as to face the radiation image detector, the radiation irradiation unit moving to a plurality of positions and irradiating, at the plurality of positions, the subject placed on the radiation image detector with radiation from various directions; an overlap-degree obtainment means for obtaining the degree of overlap of anatomical structures of the subject; and an exposure condition setting means for setting, based on the degree of overlap obtained by the overlap-degree obtainment means, a condition of exposure by the radiation irradiation unit at the plurality of positions to obtain the plurality of radiographic images. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A tomographic image obtainment method, wherein a tomographic image is reconstructed from a plurality of radiographic images obtained by irradiating a subject with radiation from various directions, the method comprising the steps of:
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obtaining the degree of overlap of anatomical structures of the subject in a direction of irradiation; and setting a condition of exposure of the subject based on the obtained degree of overlap.
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Specification