Set Title from Custom Template

Use global variables to pass values from the template to the header.

// in the template file  

global $my_page_title;  
$my_page_title="field value";  

global $my_meta_description;  
$my_meta_description = 'field value';  

get_header();  

// in the header file  
global $my_page_title;  
global $my_meta_description;  

echo $my_page_title;  
echo $my_meta_description;