Density of Tungsten Alloy Multileaf Collimator

The average transmission is sensitive to the physical density of the multileaf collimator(MLC). Since in order to make it machinable the be pure tungsten with density of 19.3 g/cm3 will give erroneous results for the calculated transmission. Tungsten material is 90%–95% tungsten plus alloying elements and may vary in density within the range 17–18 g/cm3. In practice, short of dismantling tungsten alloy multi-leaf collimator the tungsten alloy density can be determined for a particular tungsten alloy multi-leaf collimator by matching the calculated direct transmission to the measured direct transmission. Thus, the density becomes the only free parameter in the calculation. To match the measured direct transmission of 1.48% required an assumed tungsten alloy multi-leaf collimator physical density of 17.7 g/cm3. With the density and transmission values for tungsten alloy multi-leaf collimator suggests that variations in the average material density, and consequently the transmission, could be significant among individual tungsten alloy multi-leaf collimators.

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