Computed tomography based on linear scanning
First Claim
Patent Images
1. An imaging method, comprising:
- positioning an X-ray source on a first side of a subject to be imaged such that the X-ray source faces the subject;
positioning a detector on a second side of the subject such that the detector faces the subject;
linearly translating the X-ray source and the detector by simultaneously moving the X-ray source and the detector in opposite or approximately opposite directions while the X-ray source supplies X-rays and the detector acquires tomographic data of the subject; and
reconstructing a Computed Tomography (CT) image based on the tomographic datawherein linearly translating the X-ray source and the detector is performed twice, andwherein a first path traveled by the X-ray source during the first linear translation step is orthogonal to a second path traveled b the X-ray source during the second linear translation step.
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Abstract
Imaging methods and imaging systems are provided. Methods and systems of the subject invention can include linearly translating a source and a detector. The source and the detector can be moved in opposite or approximately opposite directions. Acquired data can be used to reconstruct a tomographic image by using, for example, a compressive sensing technique.
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Citations
20 Claims
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1. An imaging method, comprising:
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positioning an X-ray source on a first side of a subject to be imaged such that the X-ray source faces the subject; positioning a detector on a second side of the subject such that the detector faces the subject; linearly translating the X-ray source and the detector by simultaneously moving the X-ray source and the detector in opposite or approximately opposite directions while the X-ray source supplies X-rays and the detector acquires tomographic data of the subject; and reconstructing a Computed Tomography (CT) image based on the tomographic data wherein linearly translating the X-ray source and the detector is performed twice, and wherein a first path traveled by the X-ray source during the first linear translation step is orthogonal to a second path traveled b the X-ray source during the second linear translation step. - View Dependent Claims (2, 3, 4)
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5. An imaging method, comprising:
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positioning an X-ray source on a first side of a subject to be imaged such that the X-ray source faces the subject; positioning a detector on a second side of the subject such that the detector faces the subject; linearly translating the X-ray source and the detector by simultaneously moving the X-ray source and the detector in opposite or approximately opposite directions while the X-ray source supplies X-rays and the detector acquires tomographic data of the subject; and reconstructing a Computed Tomography (CT) image based on the tomographic data, wherein reconstructing a CT image based on the tomographic data comprises; modeling the acquired data as a linear matrix equation (b) based on a pixel basis; modeling the CT image to be reconstructed as a linear matrix equation (X) based on a pixel basis; and performing the following algorithm; step 1—
input data;
b and let X=0step 2—
calculate the current image;step 3—
minimize the total variation (TV) of the current image X; andstep 4—
no to step 2 until a stopping criterion is met,wherein step 2—
calculate the current image comprises calculating the image using the following equation; - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An imaging system, comprising:
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a main stage for a subject to be imaged; a first X-ray source positioned to face the subject being imaged and configured to linearly translate while providing X-rays; a first detector positioned to face the subject being imaged and to face the first X-ray source, and configured to linearly translate while acquiring tomographic data of the subject being imaged; a frame comprising a first motorized linear stage and a second motorized linear stage; a second X-ray source positioned to face the subject being imaged and configured to linearly translate while providing X-rays; and a second detector positioned to face the subject being imaged and to face the second X-ray source, and configured to linearly translate while acquiring tomographic data of the subject being imaged, wherein the imaging system is configured such that the first X-ray source and the first detector simultaneously move in opposite or approximately opposite directions while the first X-ray source supplies X-rays and the first detector acquires tomographic data, wherein the first X-ray source is mounted on the first motorized linear stage, wherein the first detector is mounted on the second motorized linear stage, wherein the first motorized linear stage is configured to move the first X-ray source linearly, wherein the second motorized linear stage is configured to move the first detector linearly in a direction that is opposite or approximately opposite to the direction in which the first X-ray source is moving, wherein the imaging system is configured such that the second X-ray source and the second detector simultaneously move in opposite or approximately opposite directions while the second X-ray source supplies X-rays and the second detector acquires tomographic data, wherein the frame further comprises a third motorized linear stage and a fourth motorized linear stage, wherein the second X-ray source is mounted on the third motorized linear stage, wherein the second detector is mounted on the fourth motorized linear stage, wherein the third motorized linear stage is configured to move the second X-ray source linearly, wherein the fourth motorized linear stage is configured to move the second detector linearly in a direction that is opposite or approximately opposite to the direction in which the second X-ray source is moving, and wherein the main stage is configured to allow the subject to lie down while being imaged. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification