From Passive to Active Beam Spreading at MGH

J. Flanz, H. Kooy & B. Clasie
The central goal of radiotherapy is to deliver a dose distribution which conforms as closely as possible to the target, without irradiating tissue external to the target. In order to accomplish this for external beam radiotherapy, most of the time, one needs to spread the unmodified beam to the target[for full text, please go to the a.m. URL]