Method for segmenting image data for detecting a liver
First Claim
1. A method for segmenting image data for detecting a liver of a subject under examination, wherein the image data include a number of pixels, each pixel including one signal value allocated thereto, the method comprising:
- determining, as rib pixels, pixels which represent a rib of the subject under examination;
determining pixels which delimit an area inside a rib cage of the subject under examination, with the aid of the determined rib pixels;
determining at least one pixel which represents a pixel of the liver of the subject under examination as a liver pixel, within pixels which are located in an area inside the rib cage;
defining, as background seed points, the determined rib pixels and the determined pixels which delimit the area inside the rib cage;
defining, as liver seed points, the at least one determined liver pixel; and
determining a probability, for each pixel of an area inside the rib cage, as to whether the pixel belongs to the liver or not, with the aid of a Random Walker method, with the aid of the defined liver seed points and with the aid of the defined background seed points.
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Abstract
A method is disclosed for segmenting image data for detecting a liver of a subject under examination. In at least one embodiment, the method includes determining as rib pixels which represent a rib, determining pixels which delimit an area inside the rib cage, determining pixels which represent a pixel of the liver and determining a probability, for each pixel inside the rib cage, as to whether the pixel belongs to the liver or not, with the aid of a Random Walker method.
35 Citations
31 Claims
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1. A method for segmenting image data for detecting a liver of a subject under examination, wherein the image data include a number of pixels, each pixel including one signal value allocated thereto, the method comprising:
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determining, as rib pixels, pixels which represent a rib of the subject under examination; determining pixels which delimit an area inside a rib cage of the subject under examination, with the aid of the determined rib pixels; determining at least one pixel which represents a pixel of the liver of the subject under examination as a liver pixel, within pixels which are located in an area inside the rib cage; defining, as background seed points, the determined rib pixels and the determined pixels which delimit the area inside the rib cage; defining, as liver seed points, the at least one determined liver pixel; and determining a probability, for each pixel of an area inside the rib cage, as to whether the pixel belongs to the liver or not, with the aid of a Random Walker method, with the aid of the defined liver seed points and with the aid of the defined background seed points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31)
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26. A device for segmenting image data for detecting a liver of a subject under examination, wherein the image data include a number of pixels, each pixel being allocated one signal value, the device comprising:
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an element for determining as rib pixels, pixels which represent a rib of the subject under examination; an element for determining pixels which delimit an area inside a rib cage of the subject under examination, with the aid of the determined rib pixels; an element for determining at least one pixel which represents a pixel of the liver as a liver pixel within pixels which are located in the area inside the rib cage; an element for defining, as background seed-points, the rib pixels and the pixels which delimit the area inside the rib cage; an element for defining as liver seed points the determined at least one liver pixel; and an element for determining a probability for each pixel of an area inside the rib cage, of whether the pixel belongs to the liver or not, with the aid of a Random Walker method, with the aid of the defined liver seed points and with the aid of defined the background seed points.
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Specification