Method and apparatus for brain perfusion magnetic resonance images
First Claim
1. A method for removing cerebrospinal fluid (CSF) pixels on a brain perfusion parametric image of a subject, with a magnetic resonance imaging system, the subject being administered with a contrast agent, comprising the steps of:
- a) acquiring a series of dynamic magnetic resonance images from the subject'"'"'s brain wherein the dynamic magnetic resonance images comprises at least a signal of CSF and at least a signal of brain matter;
b) calculating a brain perfusion parametric image from the dynamic images;
c) acquiring a CSF/brain-contrast-enhanced image, wherein the CSF/brain-contrast-enhanced image is defined as the signal difference between CSF and brain matter divided by a standard deviation of air background random noise is larger than 3, from the subject'"'"'s brain;
d) applying a segmentation method to the CSF/brain-contrast-enhanced image with or without the use of other images of the subject'"'"'s brain for identifying a plurality of CSF pixels containing the signal of CSF; and
e) removing the CSF pixels identified in the step d), when displaying the brain perfusion parametric image calculated in the step b).
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Abstract
The present invention discloses a method and apparatus for brain perfusion magnetic resonance imaging (MRI) technique with the removal of cerebrospinal fluid (CSF) pixels. This invention utilizes a CSF/brain-contrast-enhanced image, wherein the CSF/brain-contrast-enhanced image is defined as the signal difference between CSF and brain matter divided by a standard deviation of air background random noise is larger than 3, acquired from the subject'"'"'s brain, and applies a segmentation technique to remove the CSF pixels. After removing the CSF pixels on parametric images, the extent of brain tissue with delayed perfusion can be better identified. By using a good region of interest enclosing the correct delayed-perfusion region, the measurement on the tissue volume and perfusion parameters would be more accurate than the area contaminated by CSF pixels.
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Citations
52 Claims
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1. A method for removing cerebrospinal fluid (CSF) pixels on a brain perfusion parametric image of a subject, with a magnetic resonance imaging system, the subject being administered with a contrast agent, comprising the steps of:
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a) acquiring a series of dynamic magnetic resonance images from the subject'"'"'s brain wherein the dynamic magnetic resonance images comprises at least a signal of CSF and at least a signal of brain matter; b) calculating a brain perfusion parametric image from the dynamic images; c) acquiring a CSF/brain-contrast-enhanced image, wherein the CSF/brain-contrast-enhanced image is defined as the signal difference between CSF and brain matter divided by a standard deviation of air background random noise is larger than 3, from the subject'"'"'s brain; d) applying a segmentation method to the CSF/brain-contrast-enhanced image with or without the use of other images of the subject'"'"'s brain for identifying a plurality of CSF pixels containing the signal of CSF; and e) removing the CSF pixels identified in the step d), when displaying the brain perfusion parametric image calculated in the step b). - 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, 26)
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27. An apparatus for removing cerebrospinal fluid (CSF) pixels on a brain perfusion parametric image of a subject, with a magnetic resonance imaging system, the subject being administered with a contrast agent, comprising:
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a) first acquiring mean for acquiring a series of dynamic magnetic resonance images from the subject'"'"'s brain, wherein the dynamic magnetic resonance images comprises at least a signal of CSF and at least a signal of brain matter; b) calculating mean for calculating a brain perfusion parametric image from the dynamic images; c) second acquiring mean for acquiring a CSF/brain-contrast-enhanced image, wherein the CSF/brain-contrast-enhanced image is defined as the signal difference between CSF and brain matter divided by a standard deviation of air background random noise is larger than 3, from the subject'"'"'s brain; d) applying mean for applying a segmentation method to the CSF/brain-contrast-enhanced image with or without the use of other images of the subject'"'"'s brain for identifying a plurality of CSF pixels containing the signal of CSF; and e) removing mean for removing the CSF pixels identified from the applying mean, when displaying the brain perfusion parametric image calculated in the calculating mean. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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Specification