risky path for cassini probe?

the cassini probe is going to pass between the F and G rings,
this will no doubt bring some fantastic imaging opportunities but
isnt it a little risky? whats the chances of an impact? im sure Nasa have
done their home work but even so some risk must be there.

I believe the voyager was to pass through the rings but they decided aganst
it for the same reason im not sure where abouts though.

Simon