overlay mask on sequence of mri images to mark out tumor ROI

I created a mask based on one frame to mark out my ROI region.

segment_mask = poly2mask(xi, yi, 256, 256);

Is there a way I can overlay this mask onto my sequence of frames stored in a 3d array(256 x 256 x #of frames)?

Answer 1

[Daniel M]

maskedImg = imgArray.*segment_mask;
% segment_mask is size [256,256]
% maskedImg is same size as imgArray 
[256, 256, #of frames]

If you are using an older version of Matlab you may have to use bsxfun().

[Image Analyst]

Like this:

% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedImage3d = bsxfun(@times, image3d, cast(mask, 'like', image3d));