Tomosynthesis in a limited angular range
First Claim
1. A method of forming an X-ray layer image of an object with an X-ray device having an X-ray source and an X-ray detector, comprising the steps of:
- displacing the X-ray source and the X-ray detector in an angular range around the object in order to acquire X-ray projection images; and
forming an X-ray layer image directly from the X-ray projection images without creating an intermediary three-dimensional data set, the formed X-ray layer image being situated in a plane which extends essentially perpendicularly to a bisector of the angular range;
wherein the angular range of displacement is less than 180°
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Abstract
A method and system of forming an X-ray layer image of an object being examined by an X-ray device having an X-ray source and an X-ray detector is described. At least one of the X-ray source and the X-ray detector can be displaced in an angular range around the object in order that X-ray projection images are acquired from different directions. When forming only a single X-ray layer image, or a plurality of X-ray layer images of parallel layers of the object, the time required for the acquisition of the X-ray projection images is notably reduced by forming the X-ray layer image directly from the X-ray projection images, where the resulting X-ray layer image is situated in a plane which extends essentially perpendicularly to the bisector of the angular range of displacement. The angular range of displacement can be less then 180°. The system and method is notably applicable to a C-arm X-ray device, in which the angular range can be chosen at will.
109 Citations
16 Claims
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1. A method of forming an X-ray layer image of an object with an X-ray device having an X-ray source and an X-ray detector, comprising the steps of:
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displacing the X-ray source and the X-ray detector in an angular range around the object in order to acquire X-ray projection images; and
forming an X-ray layer image directly from the X-ray projection images without creating an intermediary three-dimensional data set, the formed X-ray layer image being situated in a plane which extends essentially perpendicularly to a bisector of the angular range;
wherein the angular range of displacement is less than 180°
.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15)
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13. An X-ray device comprising:
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an X-ray source and an X-ray detector, each situated on an opposite side of an object being examined for the acquisition of X-ray projection images of the object, wherein at least one of the X-ray source and the X-ray detector are movable so that X-ray projection images are acquired in an angular range around the object;
an image processing unit for forming an X-ray layer image from the X-ray projection images; and
a control unit for controlling the X-ray device;
wherein only X-ray projection images in an angular range of less than 180°
are acquired in order to form the X-ray layer image; and
wherein the image processing unit forms the X-ray layer image directly from the X-ray projection images without creating an intermediary three-dimensional data set, where the formed X-ray layer image is situated in a plane which extends essentially perpendicularly to a bisector of the angular range. - View Dependent Claims (14)
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16. A method of forming an X-ray layer image of an object with an X-ray device having an X-ray source and an X-ray detector, comprising the steps of:
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displacing the X-ray source and the X-ray detector over a less than 180°
angular range around an object being examined in order to acquire less than 100 X-ray projection images; and
forming at least one X-ray layer image directly from the less than 100 X-ray projection images without creating an intermediary three-dimensional data set, the formed X-ray layer image being situated in a plane which extends essentially perpendicularly to a bisector of the angular range.
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Specification