Mammogram - pectoral muscle removal

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ws 2011-10-8

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评论： Image Analyst 2015-3-20

Hi all

I have a problem with removing pectoral muscle on mammogram. After identified pectoral muscle, what should I do next? I found on some paper, they are using loop function to travel up to First zero pixel and then replace all travelled pixels with zero and in some condition is violating for consecutive 5 times, then decrease pole position for next row by 1 and replace all pixels with zero.

Below is my sample code to identified pectoral muscle area:

pect = I;
[x y] = size(I);
thres=173;
for i=1:x
    for j=1:y
        if (pect(i,j)<thres)
            pect(i,j)=0;
        end
    end
end

*Note: I is the mammogram which I have removed "white text" area.

Thank you.

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krishnasai gudavalli 2015-3-20

How to identify the pectoral muscle?

Image Analyst 2015-3-20

Post your image in a new question if my answer below about using thresholding does not work for you.

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回答（2 个）

Image Analyst 2011-10-8

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在 MATLAB Online 中打开

I think you should just do

pect(pect <= thres) = 0;

instead of the loops.

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Image Analyst 2011-10-9

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

ws 2011-10-9

This is the image link: http://imageshack.us/photo/my-images/171/tasko.png/

My task:

1. Image 1 until image 5 are the steps I already done, now I want to find the way to get image 6 and 7.

2. I need image 6 to work with original image to get the final image (image 7).

3. After done this task I will use image7 for segmentation part.

Original image for testing purpose can get it from here: http://peipa.essex.ac.uk/ipa/pix/mias/mdb041.pgm

Thank you.

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Image Analyst 2011-10-9

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You could threshold your image 5 to get a binary image. Then call imclearborder() to get the image of just the breast. Subtract that from the first binary image to get just the pect, which is touching the border. If you have cases where the breast also touches the border you'll have to do something like find the std dev of the regions and assume that the pect is the lower std dev.