In the name of Godz.Mansouri

Shahid beheshti university of medical science

3 basic application of MLCs

1.To replace conventional blocking

2.Matching the BEV to PTV during an arc rotation of X-ray beam

3.Achieve beam intensity modulation

1.upper jaw replacement

2.lower jaw replacement

3.tertiary MLC

MLC Design

Motion limitation

Motion limitation

Motion limitation

Tungsten alloy(tungestan,Fe,Cu,Ni) is the material of choice for leaf construction because:

High density Hard Inexpensive low coefficients of expansion density of Pure tungsten= 19.3 g/cm3 density of the alloys =17.0- 18.5 g/cm3

Materials and Properties

Mini MLCs

MIMiC

Non conventional MLCs

Thanks for your attention