Figure 3: Dynamic MLC fields consist of inclined radiation field. (a) The field geometry is shown. (b) The radiation fluence delivered by a dynamic field. When the beam is on, the leaves move continuously from the 20 cm position to the 17 cm position. (c) The fluence map of the inferior field when the A-leaves move in. (d) The fluence map of the superior field when the B-leaves move in.