Image generation via computed tomography system
Among other things, computed tomography (CT) systems and/or techniques for generating projections images of an object(s) under examination via a CT system are provided. The projection images of the object may represent a projection of the entire object or merely a portion of the object, such as a slice of the object. A surface about which the projection image is focused is defined and data yielded from a plurality of views of the object is mapped to the surface. In some embodiments, such a mapping comprises mapping data corresponding to a first view and yielded from a first detector cell to a first point on the surface, mapping data corresponding to the first view and yielded from a second detector cell to a second point on the surface, and/or mapping data corresponding to a second view and yielded from the first detector cell to a third point on the surface.
1. A method for generating a projection image from volumetric data, comprising:
acquiring volumetric data yielded from an examination of an object via radiation;
defining a surface about which a projection image of the object is focused;
for a first view:
determining a first trajectory between a radiation source emitting the radiation during the first view and a predefined location on a first detector cell;
identifying a first intersection between the first trajectory and the surface; and
mapping a first portion of the volumetric data, yielded from the first detector cell and corresponding to the first view, to the first intersection;
for a second view:
determining a second trajectory between the radiation source during the second view and the predefined location on the first detector cell;
identifying a second intersection between the second trajectory and the surface; and
mapping a second portion of the volumetric data, yielded from the first detector cell and corresponding to the second view, to the second intersection; and
generating a projection image based upon the mapping a first portion and the mapping a second portion.
2. The method of claim 1 , comprising:
determining a third trajectory between the radiation source during the first view and a predefined location on a second detector cell;
identifying a third intersection between the third trajectory and the surface; and
mapping a third portion of the volumetric data, yielded from the second detector cell and corresponding to the first view, to the third intersection.
3. The method of claim 2 , the generating comprising generating the projection image based upon the mapping a third portion.
4. The method of claim 1 , the generating comprising:
determining a first characteristic of a first pixel of the projection image based upon the first portion; and
determining a second characteristic of a second pixel of the projection image based upon the second portion.
5. A non-transitory computer-readable storage medium, the computer-readable storage medium including instructions that when executed by a computer, cause the computer to:
acquire volumetric data yielded from an examination of an object via radiation;
define a surface about which a projection image of the object is focused;
for a first view:
determine a first trajectory between a radiation source emitting the radiation during the first view and a predefined location on a first detector cell;
identify a first intersection between the first trajectory and the surface; and
map a first portion of the volumetric data, yielded from the first detector cell and corresponding to the first view, to the first intersection;
for a second view:
determine a second trajectory between the radiation source during the second view and the predefined location on the first detector cell;
identify a second intersection between the second trajectory and the surface; and
map a second portion of the volumetric data, yielded from the first detector cell and corresponding to the second view, to the second intersection; and
generate a projection image based upon the mapping a first portion and the mapping a second portion.
6. The computer-readable storage medium of claim 5 , wherein the instructions, when executed by a computer further cause the computer to:
determine a third trajectory between the radiation source during the first view and a predefined location on a second detector cell;
identify a third intersection between the third trajectory and the surface; and
map a third portion of the volumetric data, yielded from the second detector cell and corresponding to the first view, to the third intersection.
7. The computer-readable storage medium of claim 6 , wherein the instructions, when executed by a computer further cause the computer to: generate the projection image by generating the projection image based upon the mapping a third portion.
8. The computer-readable storage medium of claim 5 , the generating comprising:
determine a first characteristic of a first pixel of the projection image based upon the first portion; and
determine a second characteristic of a second pixel of the projection image based upon the second portion.
9. An imaging system, the imaging system comprising:
a radiation imaging system configured to examine an object via radiation; and
an image generator configured to generate a projection image from volumetric data, the image generator configured to:
acquire volumetric data yielded from an examination of a first object via radiation;
define a surface about which a projection image of the first object is focused;
for a first view:
determine a first trajectory between a radiation source emitting the radiation during the first view and a predefined location on a first detector cell;
identify a first intersection between the first trajectory and the surface; and
map a first portion of the volumetric data, yielded from the first detector cell and corresponding to the first view, to the first intersection;
for a second view:
determine a second trajectory between the radiation source during the second view and the predefined location on the first detector cell;
identify a second intersection between the second trajectory and the surface; and
map a second portion of the volumetric data, yielded from the first detector cell and corresponding to the second view, to the second intersection; and
generate a projection image based upon the mapping a first portion and the mapping a second portion.
10. The imaging system of claim 9 , wherein the image generator is configured to:
determine a third trajectory between the radiation source during the first view and a predefined location on a second detector cell;
identify a third intersection between the third trajectory and the surface; and
map a third portion of the volumetric data, yielded from the second detector cell and corresponding to the first view, to the third intersection.
11. The imaging system of claim 10 , wherein the image generator is configured to generate the projection image based upon the mapping a third portion.
12. The imaging system of claim 10 , wherein the image generator is configured to:
determine a first characteristic of a first pixel of the projection image based upon the first portion; and
determine a second characteristic of a second pixel of the projection image based upon the second portion.