Segmenting Lungs and nodules in CT images

I am new with Image processing in Matlab, I am trying to segment LUNG and nodules from CT image. I have done initial image enhancement.

I try:

    d1 = dicomread('000000.dcm'); 
  d1ca = imadjust(d1); 

d1nF = wiener2(d1ca);

d1Level  = graythresh(d1nF);
d1sBW = im2bw(d1nF,d1Level); 
sed = strel('diamon',1); 
BWfinal = imerode(d1sBW,sed);
BWfinal = imerode(BWfinal,sed);

BWoutline = bwperim(BWfinal);
Segout = d1nF;
Segout(BWoutline) = 0; 

edgePrewitt = edge(d1nF,'prewitt');

But it's not what I am looking for.

Want to segment Lung, Then detect nodules.

Reference question:

Query in segmenting Nodules in LUNG CT

Want this part:

Segmented lung region from full CT slice using region growing method

Please help me, Try to answer as simple as possible- I am totally new

[jack nn]

hi

for images Like this it is better to use some other method like otsu instead of im2bw().

[Image Analyst]

Jack, if you look in the help for graythresh(), which generates the value the passes into im2bw(), you'll see that graythresh() uses the Otsu method. It might work okay for this image though for most images Otsu is pretty bad. It works best for images with high contrast and bimodal histograms. Anyway, this post is almost 2 years old and I've posted lung segmentation code here before so I won't bother answering since I'm sure it's not a problem for sunil anymore.

[Arslan Hassaan]

Hi,i am facing the same problem can u give me the code or further guideline?