Basic Treatment Planning

What happens?

 Elimination of error A:  Sum of squares: 0²+1²= √1=1 mm  Margin = 2.5*1mm= 2.5 mm  Margin reduction: 5.6-2.5= 3.1mm!  Elimination of error B:  Sum of squares: 2²+0²= √4=2 mm  Margin = 2.5*2mm= 5 mm  Margin reduction: 5.6-5= 0.6 mm!