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. 2014 Feb 26;41(3):031501. doi: 10.1118/1.4864244

FIG. 1.

FIG. 1.

Cross-sectional view of Elekta MLC head. The leaf banks are mounted in place of the upper collimator in order to fit in the standard head cover. Each of the 80 tungsten leaves is of 7.5 cm thickness, equivalent to approximately two tenth value layers. A leaf has a width of 1 cm and a range of movement 20 cm away from the central axis to 12.5 cm across it. The 3-cm thick Y back-up diaphragm is intended to reduce any leakage through the gaps between the leaves (Ref. 22).