Calculating Volume of Tumor

Hie, i am a PG student working on a project detection of tumor from a sequence of MRI slices. After detecting the tumor from the slices, i calculate the volume of tumor. can any one help me out with the code for calculating the volume. i have this code for calculating the volume could u help me understand this code. i didnt understand what does "level" mean. Please helpme understand the code. i am new to MATLAB.

function [tumorvolume,flag] = volumetumor(handles)

% % % handles % % % pause

delxx = handles.delxx;

delyy = handles.delyy;

delzz = handles.delzz;

imagedata = handles.onlytumor;

[nx,ny,nz] = size(imagedata);

level = 3;

tumorvolume = 0.0;

%%imagedata(:,:,1)

for k=1:nz

BW =(imagedata(:,:,k)>level);

 total = bwarea(BW);
tumorvolume =tumorvolume+total*delxx*delyy*delzz;
end
tumorvolume; flag =1;

Answer 1

[Guillaume]

Looks like level is simply threshold for binarisation. Any pixel whose intensity is smaller or equal to level is considered background (set to 0) any pixel above is the tumor (set to 1).

Once each slice has been binarised, its area is calculated with bwarea (read its help to understand how that works, the algorithm is described). It's converted to a volume by multiplying it by delxx*delyy*delzz which I presume is the scale/distance of your images in the x,y,z directions.

[Sayali Lopez]

Thanks a lot for the help