Method for removing streak artifacts in medical images
First Claim
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1. In a medical imaging system a method for removing streak artifacts that extend along the row direction from an image comprised of a plurality of rows of pixels indicating brightness, the steps comprising:
- locating rows of pixels in the image based on brightness values that indicate streak artifacts therein; and
removing the steaks artifacts by replacing all the pixels in each of said located rows of pixels in the image.
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Abstract
An MRI system acquires medical images that may contain streak artifacts. A filtered copy of the acquired image is compared with the acquired image to locate rows containing streak artifacts. Located rows in the acquired image are replaced with filtered rows to remove streak artifacts without affecting the rest of the acquired medical image.
46 Citations
12 Claims
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1. In a medical imaging system a method for removing streak artifacts that extend along the row direction from an image comprised of a plurality of rows of pixels indicating brightness, the steps comprising:
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locating rows of pixels in the image based on brightness values that indicate streak artifacts therein; and removing the steaks artifacts by replacing all the pixels in each of said located rows of pixels in the image. - View Dependent Claims (10, 11, 12)
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2. In a medical imaging system a method for removing streak artifacts that extend along the row direction from an image comprised of a plurality of rows of pixels indicating brightness, the steps compromising:
locating rows of pixals in the image having brightness values that indicate streak artifacts therein by; producing a filtered copy of the image; and comparing rows in the image with corresponding rows in the filtered copy of the image; and removing the steaks artifacts by replacing located rows of pixels in the image. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. In a medical imaging system, a method for removing streak artifacts that extend along the row direction from an image comprised of a plurality of rows of pixels indicating brightness, the steps comprising:
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locating rows of pixels in the image having brightness values that indicate streak artifacts therein by producing a filtered copy of the image and comparing rows in the image with corresponding rows in the filtered copy of the image, wherein said step of producing the filtered copy includes steps of performing a discrete wavelet transform along one axis of the image, performing Fourier threshold filtering along another axis of the image and performing an inverse discrete wavelet transform along said one axis of the image; and removing the steaks artifacts by replacing said located rows of pixels in the image.
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Specification