Removing an object from an image

Hi, I am trying to remove the pectoral muscle from a mammogram image. I did this by converting it to binary doing the the following:

img2=img<150;
imclearborder(img2); %since the pectoral muscle is usually at the border of the image

This removes the pectoral muscle from the image. But I now need to convert the resulting image without the pectoral muscle back to grayscale. Can anyone advise me on how to do this please?

The first image shows a binary version of the mammogram with the pectoral muscle in the top left hand corner. The second image shows the binary image with the pectoral muscle removed. I need to convert this image back to graysclae.

Answer 1

[Image Analyst]

outputImage = originalGrayscaleImage .* uint8(binaryImage);