Abstract

Focused beams of negative pions have been developed for dynamic treatments at the Biomedical Facility in Los Alamos. In dynamic treatment, the patient is scanned under a focused pion beam. Using measured depth-dose distributions and off-axis dose distributions, we are able to find a scanning function that allows the best coverage of the target volume. Calculation of dose distributions for dynamic beam treatment plans, both in a water phantom and in a patient, illustrates the superiority of dynamic over static treatments that use broad, essentially parallel beams in shaping the dose distribution to the target volume.

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