Spot scanning system for proton radiotherapy

Abstract
Spot beam scanning provides a uniform and desirable dose distribution over a large radiation field. A new spot beam scanning system was constructed for a 70 MeV proton beam. The lateral dose distribution was uniform with .+-. 2.5% for an 18 cm2 field. Controlling the dose at each point in the radiation field was possible. This system was satisfactory for delivering a proton beam in the desired field shape and dose level.
Funding Information
  • Ministry of Education and the Ministry of Health and Welfare, Japan

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