Oblique view cone beam CT system
First Claim
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1. An oblique-view cone-beam CT system comprising:
- an X-ray source for irradiating an object with X-ray from an oblique direction with respect to a rotational axis of said object;
a detector for detecting projection images resulting from the X-ray irradiation; and
a computer electrically connected to the detector for recording the detected projection images and reconstructing the recorded projection images to provide a 3-dimensional image.
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Abstract
An oblique-view cone-beam CT system comprising an X-ray source for irradiating an object with X-ray from an oblique direction with respect to a rotational axis of said object. A detector is provided for detecting projection images resulting from the X-ray irradiation. A computer electrically connected to the detector is provided for recording the detected projection images and reconstructing the recorded projection images to provide a 3-dimensional image.
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Citations
5 Claims
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1. An oblique-view cone-beam CT system comprising:
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an X-ray source for irradiating an object with X-ray from an oblique direction with respect to a rotational axis of said object;
a detector for detecting projection images resulting from the X-ray irradiation; and
a computer electrically connected to the detector for recording the detected projection images and reconstructing the recorded projection images to provide a 3-dimensional image. - View Dependent Claims (2, 3, 4)
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5. A method of obtaining images of a sample using an oblique-view cone-beam CT system comprising:
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acquiring projection images by positioning a detector to allow a normal line passing through a detection-surface center of the detector to be oriented to a focal point of an X-ray source;
converting the projection images such that the normal line becomes perpendicular to the rotational axis of the sample;
multiplying the converted projection images by a weighting factor depending on the distance between the X-ray and the rotational axis of the sample and image coordinates Y, Z to produce weighted projection data;
fourier-transforming the weighted projection date with respect to the Y coordinate;
processing by a filter function in a frequency domain to perform a convolution; and
back projecting the Fourier-transformed data onto a 3-dimensional reconstruction grid.
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Specification