A spot, defined as a burst of monoenergetic protons in a short time segment, deposits dose nonuniformly in a narrow region.
Data flow for patient treatments using discrete spot scanning proton beam at PTC-H.
Schematic of the scanning proton beam nozzle of the Hitachi ProBeat machine at PTC-H.
Selected pristine Bragg peaks measured in water using a point by point approach.
Integral doses in at the depth of as a function of energy. Circles are measured integral doses; squares are corrected integral doses; and dashed line is the correction factors.
Linearity of the response of the main dose monitor over the range of MUs permitted by the system for 221.8 and proton beams with range of 30.6 and in water, respectively.
FWHM of lateral profiles in air of single pencil beams at the isocenter plane as function of proton nominal energy .
In-plane half lateral profiles of single pencil beams at isocenter plane in air for 72.5, 148.8, and energies. Measurements were performed with a cylindrical ionization chamber (model 31014, PTW-Freiburg, Freiburg, Germany).
In-plane half lateral profile of single pencil beams measured in water for 72.5, 148.8, and . The surface of the water was placed at the isocenter plane.
Example of spot position measurements using radiochromic films.
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