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Table 2 Dose to cochlea and heart by radiation delivery technique following craniospinal irradiation for childhood medulloblastoma

From: The clinical case for proton beam therapy

   Radiation delivery technique

Dose to 90% of the cochlea, %

Dose to 50% of the heart volume, %

Conventional x-ray beam

101.2

72.2

Intensity modulated x-ray beam

33.4

29.5

Proton beam

2.4

0.5

  1. Data from St Clair et al. [40].