Sensitivity encoding magnetic resonance imaging method and system
AssigneeGE Medical Systems Global Technology Company, LLC
InventorsKevin F. King, Elisabeth Angelos
Life of this patent
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Abstract
A method and apparatus are disclosed for deriving an enhanced sensitivity matrix for describing coil sensitivity in a magnetic resonance imaging system. The enhanced sensitivity matrix provides sensitivity information for pixels near the edge of the imaged object such that pixels near the edge for which there was no sensitivity information are associated with a derived sensitivity. Likewise pixels near the edge for which there is measured sensitivity information are instead associated with a derived sensitivity to offset deficient sensitivity measurements near the edge of the object.
Claims38
A method for estimating coil sensitivities in a magnetic resonance imaging system comprising:
- locating an edge pixel within one or more columns or rows of a magnetic resonance image;
- and
- calculating a sensitivity function describing coil sensitivity for the edge pixel based upon two or more fitting pixels inward of the edge pixel.
A method for generating an enhanced sensitivity matrix for an object comprising:
- obtaining an initial calibration image of the object;
- locating at least one object edge within one or more columns or rows of the calibration image, wherein the object edge comprises an object edge pixel;
- calculating a sensitivity function for each object edge based upon the measured sensitivity of two or more fitting pixels located inward of the object edge pixel;
- and
- assigning a respective sensitivity value derived from the sensitivity function to each of one or more outer pixels located outward from the object edge pixel.
A magnetic resonance imaging system capable of estimating coil sensitivities, the system comprising:
- a magnetic resonance scanner capable of generating a calibration image;
- and
- an analysis circuit capable of receiving the calibration image, the analysis circuit processing the image by locating an edge pixel within columns or rows of the image and by calculating a sensitivity function from two or more fitting pixels disposed inward of the edge pixels, wherein the sensitivity function describes coil sensitivities near the edge pixels.
A magnetic resonance imaging system capable of generating an enhanced sensitivity matrix for a subject, the system comprising:
- a magnetic resonance scanner capable of generating a calibration image;
- and
- an analysis circuit capable of receiving the calibration image, the analysis circuit processing the image by locating an edge pixel within columns or rows of the image;
- by calculating a sensitivity function from two or more fitting pixels disposed inward of the edge pixel, wherein the sensitivity function describes coil sensitivity near the edge pixel;
- and by assigning a respective calculated sensitivity derived from the sensitivity function to each of one or more outer pixels disposed outward from the edge pixel.
A magnetic resonance imaging system capable of generating an optimized image for a subject, the system comprising:
- a magnetic resonance scanner capable of generating a diagnostic image and a calibration image;
- an analysis circuit capable of receiving the diagnostic image and the calibration image, the analysis circuit comprising a means for generating an enhanced sensitivity matrix using the calibration image, wherein the analysis circuit corrects the diagnostic image using the enhanced sensitivity matrix to generate a corrected diagnostic image;
- and
- a display circuit capable of receiving the corrected diagnostic image and transmitting the corrected diagnostic image to a suitable display device.
Dependencies are inferred from the claim text.