Course book Advanced Treatment Planning 2018
MLC geometry: Varian (millenium MLC)
▪ 120 MLC ▪ max field size : 40 x 40 cm
- 20 cm : leaf width = 5mm, outside, 1 cm
20cm
10cm
▪ maximum overtravel in (IMRT) fields is 14.3 cm: - so, if an IMRT field width ≥ 14.3 cm splitting beam - field width ≈ 28 cm splitting again (‘ carriage positions ’)
▪ inter-digitating MLC’s ▪ closing opposing leaf-pairs
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