683 / 879
2
Beam Output Audit (BOA)
0
5
10
15
20
25
underdosage
overdosage
%
loss of local control
exc ss mild to
moderate complications
114 beams in 35 institutions
7-8 %
19-22%
Bentzen, EJC, 36: 615, 2000
Clinical effect in 10% of beams with lowest and highest output