Thanks vlau and others.
I made something like this and it's working:
I add my.skill47 = 9; to my enemy(the head). The enemys body is scaning the "nodes" and the enemys head is scaning for player.
So when the enemys head is scaning the nodes, they are ignored, because
look at the script:

if (event_type == event_scan)
{
if (you.skill47 == 9)//Scanned by head
{
my.enable_scan = off;
}
else
{
if (you.skill47 == 1234) // Scanned by body
{

And everything is working ... Thanks ...