Cone-beam CT imaging scheme
First Claim
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1. A method for medical imaging comprising:
- a) performing a multi-detector computed tomography (MDCT) scan of a patient to produce MDCT scan data;
b) reconstructing MDCT image slices from the MDCT scan data;
c) performing a cone-beam computed tomography (CBCT) scan of the patient using a CBCT beam source to produce CBCT scan data, wherein performing the CBCT scan comprises positioning a patterned lead sheet between the CBCT beam source and the patient to partially block x-rays from the CBCT beam source, such that the CBCT scan data is produced from a partially blocked CBCT beam;
d) reconstructing CBCT image slices from the CBCT scan data;
e) performing 3D rigid registration of the MDCT image slices and the CBCT image slices to obtain fused reconstructed images of the patient;
wherein the method further comprises;
storing a scatter distribution for the patient; and
correcting for scatter by using scatter estimates derived from the scatter distribution together with a kernel-based scatter model.
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Abstract
A general imaging scheme is proposed for applications of CBCT. The approach provides a superior CBCT image quality by effective scatter correction and noise reduction. Specifically, in its implementation of CBCT imaging for radiation therapy, the proposed approach achieves an accurate patient setup using a partially blocked CBCT with a significantly reduced radiation dose. The image quality improvement due to the proposed scatter correction and noise reduction also makes CBCT-based dose calculation a viable solution to adaptive treatment planning.
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16 Claims
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1. A method for medical imaging comprising:
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a) performing a multi-detector computed tomography (MDCT) scan of a patient to produce MDCT scan data; b) reconstructing MDCT image slices from the MDCT scan data; c) performing a cone-beam computed tomography (CBCT) scan of the patient using a CBCT beam source to produce CBCT scan data, wherein performing the CBCT scan comprises positioning a patterned lead sheet between the CBCT beam source and the patient to partially block x-rays from the CBCT beam source, such that the CBCT scan data is produced from a partially blocked CBCT beam; d) reconstructing CBCT image slices from the CBCT scan data; e) performing 3D rigid registration of the MDCT image slices and the CBCT image slices to obtain fused reconstructed images of the patient; wherein the method further comprises; storing a scatter distribution for the patient; and correcting for scatter by using scatter estimates derived from the scatter distribution together with a kernel-based scatter model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification