Correction of spatial artifacts in radiographic images
First Claim
Patent Images
1. A method for correcting spatial artifacts within a composite radiographic image of an object, said method comprising the steps of:
- generating the composite image by assembling a plurality of views of the object imaged by a radiographic scanner, wherein each view represents a different time, relative motion exists between the radiographic scanner and the object, and each view corresponds to a portion of data used to generate the composite image and where each view is no more than two pixels wide in a horizontal direction and many pixels tall in a vertical direction to cover entire height of the object;
estimating a correctional shift profile comprising tailored correctional shifts for at least two of the views;
correcting the views using the corresponding correctional shifts; and
re-generating the image by assembling the corrected views.
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Abstract
The present invention encompasses methods, apparati, and computer-readable media for correcting spatial artifacts in composite radiographic images of an object (1). A method embodiment of the present invention comprises the steps of generating the composite image from a plurality of views of the object (1); estimating a shift profile; and re-generating the image by shifting the views using the shift profile.
5 Citations
26 Claims
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1. A method for correcting spatial artifacts within a composite radiographic image of an object, said method comprising the steps of:
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generating the composite image by assembling a plurality of views of the object imaged by a radiographic scanner, wherein each view represents a different time, relative motion exists between the radiographic scanner and the object, and each view corresponds to a portion of data used to generate the composite image and where each view is no more than two pixels wide in a horizontal direction and many pixels tall in a vertical direction to cover entire height of the object; estimating a correctional shift profile comprising tailored correctional shifts for at least two of the views; correcting the views using the corresponding correctional shifts; and re-generating the image by assembling the corrected views. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for correcting spatial artifacts within a composite radiographic image of an object, said method comprising the steps of:
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generating the composite image by assembling a plurality of views of the object imaged by a radiographic scanner, wherein each view represents a different time, relative motion exists between the radiographic scanner and the object, and each view corresponds to a portion of data used to generate the composite image; estimating a correctional shift profile comprising tailored correctional shifts for at least two of the views; correcting the views using the corresponding correctional shifts; and re-generating the image by assembling the corrected views; wherein the step of estimating a correctional shift profile utilizes an optimization algorithm; and the optimization algorithm is applied to find the correctional shift profile that minimizes a sum of a set of penalty functions such that the optimization algorithm at least approximately satisfies a set of hard constraints, wherein each hard constraint uses a Fourier transform to constrain high frequency components of the shift profile to be within a preselected value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. At least one non-transitory computer-readable medium containing computer program instructions for correcting spatial artifacts within a composite radiographic image of an object, said instructions performing the steps of:
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generating the composite image by assembling a plurality of views of the object imaged by a radiographic scanner, wherein each view represents a different time, relative motion exists between the radiographic scanner and the object, and each view corresponds to a portion of data used to generate the composite image and where each view is no more than two pixels wide in a horizontal direction and many pixels tall in a vertical direction to cover entire height of the object; estimating a correctional shift profile comprising tailored correctional shifts to be applied to at least two of the views; correcting the views using the corresponding correctional shifts; and re-generating the image by assembling the corrected views.
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25. Apparatus for correcting spatial artifacts within a composite radiographic image of an object, said apparatus comprising:
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a radiographic image scanner adapted to produce a plurality of views of the object, wherein each view represents a different time, relative motion exists between the radiographic scanner and the object, and each view corresponds to a portion of data used to generate the composite image and where each view is no more than two pixels wide in a horizontal direction and many pixels tall in a vertical direction to cover entire height of the object; coupled to the radiographic image scanner, means for estimating a correctional shift profile comprising tailored correctional shifts to be applied to at least two of the views; coupled to the estimating means, means for correcting the views using the corresponding correctional shifts; and coupled to the correcting means, means for assembling the corrected views to form a corrected image. - View Dependent Claims (26)
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Specification