Combining 2D plots laying in 3D image

Hello together,

I'm quite new in Using Matlab, so this may is a easy question:

I got an intensity profile of a grey image, so the mean(..) function is related to the three different color channels.

I have to get the curve of a crossline through the image, so

x = [1 866];
y = [379 379]

after loading the matrix

my code is:

x = [1 866];
y = [379 379];
Dose_medfilt = medfilt2(mean(Dose, 3), [5, 5]);    %medfilt2 is for making the curve smooth for every value, looking at 5 pixels arround)
improfile(mean(Dose_medfilt, 3), x, y);     
grid on

Since the image has also a y direction, i have to extract 11 dose profiles (from [374 374] until [384 384]) and take the mean curve of it.

Can anyone tell me how to do this?