X-ray flux management device
First Claim
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1. An x-ray filter comprising:
- a 3D cylindrical rotatable filter body formed of x-ray attenuating matter; and
a semi-conical bore formed in the 3D cylindrical rotatable filter body, the semi-conical bore having an elliptically shaped base.
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Abstract
The invention is directed to an x-ray flux management device that adaptively attenuates an x-ray beam to limit the incident flux reaching a subject and radiographic detectors in potentially high-flux areas while not affecting the incident flux and detector measurements in low-flux regions. While the invention is particularly well-suited for CT, the invention is also applicable with other x-ray imaging systems. In addition to reducing the required detector system dynamic range, the present invention provides an added advantage of reducing radiation dose.
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Citations
20 Claims
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1. An x-ray filter comprising:
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a 3D cylindrical rotatable filter body formed of x-ray attenuating matter; and a semi-conical bore formed in the 3D cylindrical rotatable filter body, the semi-conical bore having an elliptically shaped base. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of fabricating a CT imaging system filter comprising:
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providing a cylindrical body of x-ray attenuating material; forming a semi-conical bore having an elliptically shaped base in the cylindrical body; and positioning the cylindrical body between an x-ray detector and an x-ray source. - View Dependent Claims (10, 11, 12, 13, 14)
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15. An x-ray filter assembly comprising:
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a first bowtie filter having an effective beam profile; and a second bowtie filter stacked on top of the first bowtie filter in a first direction parallel to a direction of travel of an x-ray through the first and second bowtie filters; wherein the first and second bowtie filters are laterally translatable in a second direction orthogonal to the first direction to change an effective beam profile during image data acquisition; and wherein the first and second bowtie filters are tiltable to change the attenuation profile such that an x-ray beam passes through both the first bowtie filter and the second bowtie filters. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification