Using variables as image names

My site has 20 fixed pages. I would like to use different images with the name of each page instead of the post headline.

Because I will be forced to make a call for each image in each post, I am looking to hardcode the line of code.

Is it possible to use a variable in the image call, lets say bfa_post_headline, so the call will be something like:
<img src=" $bfa_post_headline" ".jpg">