how to segmentation mammographic images by seeds region growing

i did this code to convert image to binary and make the digitization so i get it

if true

    x=imread('mdb004.tif');
     x=medfilt2(x);
     x=im2bw(x,0.0706);
     i2=imopen(i,strel('disk',50));
     [bw, n]=bwlabel(i2,4);
     i3=(bw==1);
    image= x.*uint8(i8)
    imshow(i3),figure, imshow(image)
  end

% i didn't know how to segment it by region growing

[Image Analyst]

I don't know what i8 is, but you already seem to have segmented out the breast. What else do you want?