get page template

Greeting all,

Am currently writing a admin page, i’ve have added some custom template and i need to add custom option to them(each page from this layout have a different banner), i have create a special menu for this.

now i need to list all the existing page and filter out only those who uses this specific template?

i’ve done some research but i cant find out where thise parameter is saved
up to now i am only able to list existing pages with “get_pages();”

thanks for all