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Intensity correction for MR images (Cohen et al)
| Intensity correction for MR images (Cohen et al) [message #45013] |
Mon, 08 August 2005 07:18 |
pravesh.subramanian
Messages: 21
Registered: August 2005
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Junior Member |
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Hello Group,
I sincerely thank everyone for the prompt replies I have been getting
from time to time.
I have been reading a paper by Cohen et al for intensity Inhomogeneity
correction. It suggests these steps to implement the algorithm:
1. Automatically determine the noise pixels and fill them up with mean
intensity of the non-noise pixels.
(Here, to classify noise pixels, he first smoothes the histogram with
a hanning kernel, then dtermines the first max at lowest signal
intensities and then calculates minimum in the lowest 15% of the
intensities!)
2. smooth the image with a gaussian kernel (we could use fft to operate
in k-space and quicken the process. i need to make a gaussian kernel of
size [192,192]. any idea what is the function for a gaussian kernel?)
3. normalize the original image by this smooth image
Steps 1 and 2 need some more light in the right direction.
Thanks,
Pravesh
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