45 設d代表深度，dm代表最大劑量深度，f1與f2代表不同SSD，則Mayneord F factor為：
(A)F=
(B)F = (f2+dm)/(f1+d)
(C)F = 0.5×((f2+dm)/(f1+d))
(D)F = 2×((f1+d)/(f2+dm))

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統計： A(421), B(14), C(12), D(1), E(0) #1062621