Three dimensional image reconstruction from single plane X-ray fluorograms
First Claim
1. A method for the three dimensional image reconstruction of single plane 2-dimensional X-ray image projection of an object having at least one plane of symmetry comprising:
- a) substantially uniformly filling the object with an X-ray contrast agent said contrast agent having a pre-selected concentration and absorption coefficient;
b) irradiating said contrast agent-filled object with X-rays substantially perpendicular to said at least one plane of symmetry of the object;
c) detecting said X-rays transmitted through said contrast agent-filled object to define a 2-dimensional projection image with pixels (x,y) having an intensity related to the absorbance of said contrast agent-filled object;
d) processing said 2-dimensional projection image to reconstruct the 3-dimensional image of said object, said processing including determining a distance D(x,y) travelled by said X-rays in the contrast agent-filled object by dividing the absorbance corresponding to the intensity of each pixel (x,y) by the concentration of the contrast agent within said object and multiplying the result thus obtained by the absorption coefficient of said contrast agent;
dividing said distance D(x,y) by 2 to define a (+z) coordinate (equals to +D(x,y)/2) and a (−
z) coordinate (equals to −
D(x,y)/2) for each pixel (x,y);
such that for each pixel (x,y) there is;
1) a (+z) coordinate=+D(x,y)/2 and 2) a (−
z) coordinate=−
D(x,y)/2;
e) using the x,y,z coordinates thus determined to reconstruct the 3 dimensional image in a 3-dimensional axis system in which the x-y plane is parallel to the plane of symmetry of said object;
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Abstract
A method is provided to reconstruct the three-dimensional image of an X-ray contrast agent-filled object having at least one plane of symmetry using a single plane two-dimensional X-ray projection. The projection is obtained by irradiating the object with X-rays substantially perpendicular to a selected plane of symmetry of the object. The absorbance value of each pixel in the projection, which is related to the distance travelled by the X-ray within the object, is then divided by 2 to define the z coordinates on each side of the x-y plane of symmetry of the object. The z coordinates together with the x,y coordinates of each pixel define the three-dimensional contour of the object.
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Citations
17 Claims
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1. A method for the three dimensional image reconstruction of single plane 2-dimensional X-ray image projection of an object having at least one plane of symmetry comprising:
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a) substantially uniformly filling the object with an X-ray contrast agent said contrast agent having a pre-selected concentration and absorption coefficient;
b) irradiating said contrast agent-filled object with X-rays substantially perpendicular to said at least one plane of symmetry of the object;
c) detecting said X-rays transmitted through said contrast agent-filled object to define a 2-dimensional projection image with pixels (x,y) having an intensity related to the absorbance of said contrast agent-filled object;
d) processing said 2-dimensional projection image to reconstruct the 3-dimensional image of said object, said processing including determining a distance D(x,y) travelled by said X-rays in the contrast agent-filled object by dividing the absorbance corresponding to the intensity of each pixel (x,y) by the concentration of the contrast agent within said object and multiplying the result thus obtained by the absorption coefficient of said contrast agent;
dividing said distance D(x,y) by 2 to define a (+z) coordinate (equals to +D(x,y)/2) and a (−
z) coordinate (equals to −
D(x,y)/2) for each pixel (x,y);
such that for each pixel (x,y) there is;
1) a (+z) coordinate=+D(x,y)/2 and 2) a (−
z) coordinate=−
D(x,y)/2;
e) using the x,y,z coordinates thus determined to reconstruct the 3 dimensional image in a 3-dimensional axis system in which the x-y plane is parallel to the plane of symmetry of said object;
- View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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2. A method for the three dimensional image reconstruction of single plane 2-dimensional X-ray image projection of an object having at least one plane of symmetry comprising:
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a) irradiating said object with X-rays substantially perpendicular to said at least one plane of symmetry of the object;
b) detecting said X-rays transmitted through said object to define a 2-dimensional projection mask image with pixels (x,y) having an intensity related to the absorbance of said object;
c) substantially uniformly filling the object with an X-ray contrast agent said contrast agent having a pre-selected concentration and absorption coefficient;
d) irradiating said contrast agent-filled object with X-rays substantially perpendicular to said at least one plane of symmetry of the object;
e) detecting said X-rays transmitted through said contrast agent-filled object to define a 2-dimensional projection live image with pixels (x,y) having an intensity related to the absorbance of said contrast agent-filled object;
f) subtracting said mask image from said live image to obtain a 2-dimensional final image;
d) processing said 2-dimensional final image to reconstruct the 3-dimensional image of said object, said processing including determining a distance D(x,y) travelled by said X-rays in the contrast agent-filled object by dividing the absorbance corresponding to the intensity of each pixel (x,y) by the concentration of the contrast agent within said object and multiplying the result thus obtained by the absorption coefficient of said contrast agent;
dividing said distance D(x,y) by 2 to define a (+z) coordinate (equals to +D(x,y)/2) and a (−
z) coordinate (equals to −
D(x,y)/2) for each pixel (x,y);
such that for each pixel (x,y) there is;
1) a (+z) coordinate=+D(x,y)/2 and 2) a (−
z) coordinate=−
D(x,y)/2;
e) using the x,y,z coordinates thus determined to reconstruct the 3-dimensional image in a 3-dimensional axis system in which the x-y plane is parallel to the plane of symmetry of said object;
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Specification