Tomography of curved surfaces
First Claim
Patent Images
1. A device for tomography of an object having a curved surface comprising:
- a source of penetrating radiation;
a detector having a curved shape corresponding to the curved surface; and
a processor system configured to determine an expected distortion for each of a plurality of points in a projection of the curved surface onto the detector, and configured to correct each of the plurality of points in the protection according to the expected distortion of that point by replacing pixel values in the uncorrected projection with corresponding interpolated pixel values at the expected positions.
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Abstract
Disclosed are a method and apparatus for tomography of a curved surface in an object. One embodiment is a method that includes determining an expected distortion for each of a plurality of points in a projection of the curved surface, and correcting each of the plurality of points in the projection according to the expected distortion of that point by replacing pixel values in the uncorrected projection with corresponding interpolated pixel values at the expected positions.
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Citations
34 Claims
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1. A device for tomography of an object having a curved surface comprising:
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a source of penetrating radiation;
a detector having a curved shape corresponding to the curved surface; and
a processor system configured to determine an expected distortion for each of a plurality of points in a projection of the curved surface onto the detector, and configured to correct each of the plurality of points in the protection according to the expected distortion of that point by replacing pixel values in the uncorrected projection with corresponding interpolated pixel values at the expected positions. - View Dependent Claims (2, 3, 4, 5)
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6. A method for tomography of a curved surface in an object, comprising the steps of:
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determining an expected distortion for each of a plurality of points in a projection of the curved surface onto a detector; and
correcting each of the plurality of points in the protection according to the expected distortion of that point by replacing pixel values in the uncorrected projection with corresponding interpolated pixel values at the expected positions. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A device for tomography of a curved surface in an object, comprising:
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means for determining an expected distortion of a plurality of points in a projection of the curved surface on a detector; and
means for correcting the projection according to the expected distortion of at least two of the points; and
means for replacing pixel values in the uncorrected projection with corresponding pixel values at corrected positions. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for tomography of a curved surface in an object, comprising the steps of:
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determining an expected distortion for each of a plurality of points in a projection of the curved surface onto a detector; and
correcting each of the plurality of points in the projection according to the expected distortion of that point, wherein said determining step further comprises the steps of;
for each of the points in the projection, locating a corresponding reference point on a reference surface of the object;
for each of the reference points on the reference surface, finding a corresponding point on the curved surface of the object; and
determining an expected distortion in the projection for each point on the curved surface. - View Dependent Claims (21, 22, 23, 24)
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25. A device for tomography of a curved surface in an object, comprising:
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means for determining an expected distortion of a plurality of points in a projection of the curved surface on a detector; and
means for correcting the projection according to the expected distortion of at least two of the points, wherein the determining means further comprises;
means for designating a reference surface in the object, said reference surface having a shape corresponding to a surface of the detector;
means for determining a deviation from the reference surface for each of the plurality of points on the curved surface; and
means for determining the expected distortion in the projection for each of the points based upon the determined deviation from the reference surface. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A device for tomography of an object having a curved surface comprising:
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a source of penetrating radiation;
a detector having a curved shape corresponding to the curved surface; and
a processor system configured to determine an expected distortion for each of a plurality of points in a projection of the curved surface onto the detector, and configured to correct each of the plurality of points in the projection according to the expected distortion of that point by locating a corresponding reference point on a reference surface of the object for each of the points in the projection, by finding a corresponding point on the curved surface of the object for each of the corresponding reference points on the reference surface, and by determining the expected distortion in the projection for each point on the curved surface.
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33. A computer-readable medium having a program for tomography of a curved surface in an object, the program comprising logic configured to perform the steps of:
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determining an expected distortion of a plurality of points in a projection of the curved surface on a detector; and
correcting the projection according to the expected distortion of at least two of the points, wherein the determining further comprises;
designating a reference surface in the object, said reference surface having a shape corresponding to a surface of the detector;
determining a deviation from the reference surface for each of the plurality of points on the curved surface; and
determining the expected distortion in the projection for each of the points based upon the determined deviation from the reference surface.
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34. A computer-readable medium having a program for tomography of a curved surface in an object, the program comprising logic configured to perform the steps of:
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determining an expected distortion for each of a plurality of points in a projection of the curved surface onto a detector; and
correcting each of the plurality of points in the projection according to the expected distortion of that point by replacing pixel values in the uncorrected projection with corresponding interpolated pixel values at expected positions.
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Specification