REDUCING ARTEFACTS IN MRI IMAGE DATA
First Claim
1. A computer-implemented method for reducing artefacts in an MRI image as a result of radiation induced current in collector coils of an MRI apparatus, the method comprising:
- selecting a plurality of pixels in a k-space image prior to generation of the MRI image;
analysing each of the plurality of selected pixels to determine whether a pixel intensity is greater than a predefined global threshold;
for each pixel having pixel intensity greater than the predefined global threshold, determining whether the pixel lies within a signal region of the k-space image or outside of the signal region of the k-space image;
for each pixel that lies outside of the signal region, modifying the pixel intensity to be similar to a background pixel intensity, thereby creating a modified k-space image; and
generating the MRI image based on the modified k-space image.
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Accused Products
Abstract
A computer-implemented method is provided for reducing artefacts in an MRI image as a result of radiation induced current in collector coils of an MRI apparatus. The method comprises the following steps. Selecting a plurality of pixels in a k-space image prior to generation of the MRI image. Analysing each of the plurality of selected pixels to determine whether a pixel intensity is greater than a predefined global threshold. For each pixel having pixel intensity greater than the predefined global threshold, determining whether the pixel lies within a signal region of the k-space image or outside of the signal region of the k-space image. For each pixel that lies outside of the signal region, modifying the pixel intensity to be similar to a background pixel intensity, thereby creating a modified k-space image. Generating the MRI image based on the modified k-space image. A non-transitory computer readable medium and a radiation therapy system configured to implement the method are also provided.
24 Citations
20 Claims
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1. A computer-implemented method for reducing artefacts in an MRI image as a result of radiation induced current in collector coils of an MRI apparatus, the method comprising:
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selecting a plurality of pixels in a k-space image prior to generation of the MRI image; analysing each of the plurality of selected pixels to determine whether a pixel intensity is greater than a predefined global threshold; for each pixel having pixel intensity greater than the predefined global threshold, determining whether the pixel lies within a signal region of the k-space image or outside of the signal region of the k-space image; for each pixel that lies outside of the signal region, modifying the pixel intensity to be similar to a background pixel intensity, thereby creating a modified k-space image; and generating the MRI image based on the modified k-space image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer-readable medium having stored thereon instructions for reducing artefacts in an MRI image as a result of radiation induced current in collector coils of an MRI apparatus, the instructions when executed by a processor cause the processor to:
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select a plurality of pixels in a k-space image prior to generation of the MRI image; analyse each of the plurality of selected pixels to determine whether a pixel intensity is greater than a predefined global threshold; for each pixel having pixel intensity greater than the predefined global threshold, determine whether the pixel lies within a signal region of the k-space image or outside of the signal region of the k-space image; for each pixel that lies outside of the signal region, modify the pixel intensity to be similar to a background pixel intensity, thereby creating a modified k-space image; and generate the MRI image based on the modified k-space image. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A radiation therapy system comprising:
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a radiation source configured to generate a radiation treatment beam; a magnetic resonance imaging (MRI) apparatus configured to acquire image data; and processing structure configured to process the acquired image data to reduce artefacts in an MRI image caused by the radiation treatment beam; the processing structure comprising a processor and memory for storing instructions which, when executed, cause the processor to; select a plurality of pixels in a k-space image prior to generation of the MRI image; analyse each of the plurality of selected pixels to determine whether a pixel intensity is greater than a predefined global threshold; for each pixel having pixel intensity greater than the predefined global threshold, determine whether the pixel lies within a signal region of the k-space image or outside of the signal region of the k-space image; for each pixel that lies outside of the signal region, modify the pixel intensity to be similar to a background pixel intensity, thereby creating a modified k-space image; and generate the MRI image based on the modified k-space image.
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Specification