Spot-size effect reduction
First Claim
1. A radiographic imaging device, comprising:
- an X-ray source for emitting a beam of X-ray radiation toward an object, the X-ray source having a finite focal spot characterized by an X-ray intensity distribution;
a detector assembly for receiving at least part of the X-ray radiation after the X-ray radiation passes through the object and producing a signal in response thereto; and
an image processor for constructing an image from the signal generated by the detector, wherein the image processor filters at least one of the signal and the image using the X-ray intensity distribution for mitigating distortion of the constructed image caused by the finite focal spot size.
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Abstract
A radiographic imaging device includes an X-ray source having a finite focal spot characterized by a determined intensity distribution. The X-ray source emits a beam of X-ray radiation toward an object. A detector assembly receives at least part of the X-ray radiation after it passes through the object. The detector assembly produces a signal in response to the received radiation. An image processor constructs an image from the signal generated by the detector assembly using the determined intensity distribution of the X-ray source. By inverse filtering the aggregated detector image from the detector assembly, the effects of the finite focal spot size of the X-ray source are mitigated, improving the quality of the resulting image.
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Citations
20 Claims
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1. A radiographic imaging device, comprising:
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an X-ray source for emitting a beam of X-ray radiation toward an object, the X-ray source having a finite focal spot characterized by an X-ray intensity distribution;
a detector assembly for receiving at least part of the X-ray radiation after the X-ray radiation passes through the object and producing a signal in response thereto; and
an image processor for constructing an image from the signal generated by the detector, wherein the image processor filters at least one of the signal and the image using the X-ray intensity distribution for mitigating distortion of the constructed image caused by the finite focal spot size. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for mitigating the effect of finite focal spot size in a radiographic imaging device, the radiographic imaging device having an X-ray source having a finite focal spot for emitting X-ray radiation toward an object so that at least part of the X-ray radiation passes through the object, comprising:
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determining the intensity distribution for the X-ray source;
receiving at least part of a beam of X-ray radiation emitted by the X-ray source after the beam of X-ray radiation passes through the object and producing a signal in response thereto;
constructing an image from the signal generated by the detector; and
filtering at least one of the signal and the image using the X-ray intensity distribution for mitigating distortion of the constructed image caused by the finite focal spot size. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for determining the X-ray intensity distribution of an X-ray source of a radiographic imaging device, the X-ray source having a finite focal spot for emitting X-ray radiation, including:
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a scintillation screen placed within the beam of the X-ray radiation, beam of X-ray radiation causing the scintillation screen to emit light having an intensity distribution corresponding to the intensity distribution of the finite focal spot;
an imaging device for detecting the light emitted by the scintillation screen and producing an image signal in response thereto, the image signal containing the intensity distribution; and
a digitizer for converting the image signal into a computer-readable matrix of pixel information. - View Dependent Claims (18, 19, 20)
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Specification