Tungsten Collimator Rings in Gamma Knife

In a gamma knife machine, a total of 192 60Co sources are arranged in a cylindrical configuration in five concentric tungsten collimator rings. The radiation cavity has been increased by more than 300% compared to previous models. However, due to an improved collimation system (120 mm tungsten collimator rings), the average distance from source to focus is very close to previous models. This results in similar output for the prior 18mm and new 16 mm administrations. This differs substantially from the previous hemispherical arrangements and results in different source to focus distances for each ring varying from 374 to 433 mm. The primary and secondary collimators have been replaced by a single large 120 mm thick tungsten collimator rings.

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