what does the minus value of pixel mean in MRI
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I got one MRI image. when I read it into MATLAB with the function 'dicomread', I found that the pixel format was int16, some pixels got a minus value. how can I convert the pixel into 0-255?
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Walter Roberson
2015년 11월 6일
What is the Photometric Interpretation set to?
Also is the negative after the rescale? CT images for example often want to use Hounsfield units, which can be negative; see https://www.medicalconnections.co.uk/kb/Hounsfield_Units
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Image Analyst
2015년 11월 6일
Try using mat2gray():
image8bit = uint8(255*mat2gray(double(image16bit)));
This will scale it from min (the negative number) to max -> [0,255]. If you want to get rid of negative numbers in advance, do this:
image16bit(image16bit < 0) = 0;
image8bit = uint8(255*mat2gray(double(image16bit)));
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Image Analyst
2015년 11월 6일
I have no idea why the data is signed instead of uint16, and why there are negative values. Perhaps ask the radiologist who created it.
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