Magnetic scanning system for heavy ion therapy

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Abstract

Beams of heavy ions have favourable physical and biological properties for the use in radiotherapy. These advantages are most pronoucced if the beam is delivered in a tumor-conform way by active beam scanning. A magnetic scanning technique is used to spread the beam laterally. The range of the particles in tissue is controlled by the variation of the beam energy in the accelerator. Computer simulations were used to compare a discrete scan mode (pixel scan) with a continous scan mode (raster scan). It was found that both methods lead to nearly identical results. The design and technical realization of the magnetic scanning system at GSI combines features of both scan techniques. First results using the lateral beam scanning method as well as the combination of the active energy variation with the magnetic beam scanning are presented.

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    Citation Excerpt :

    Due to the electromagnetic deflection of the pencil beam, these systems are also called pencil-beam scanning systems. The HIT facility in Germany can deliver protons, helium, carbon, and oxygen beams with this technology (Haberer et al., 1993, 2004; Jäkel et al., 2022). Other facilities partially combine these techniques; for a more detailed description, the reader is referred to the review by Schardt et al. (2010), the International Commission on Radiation Units and Measurements (ICRU) Report 93 (ICRU, 2016), and references therein.

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