Evaluation of an empirical monitor output estimation in carbon ion radiotherapy

Matsumura, Akihiko; Yusa, K.; Kanai, Tatsuaki; Mizota, Manabu; Ohno, Tatsuya; Nakano, Takashi

doi:10.1118/1.4928145

Cited by 1 publication

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References 23 publications

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“…We maintained this 2D-scanning-field size for all of measurements in this examination of the system. The beam-spot diameter of the monoenergetic beam at the isocenter position was measured in two orthogonal directions by a PinPoint ionization chamber (PTW model 31014) without an absorber (Matsumura et al (2015).…”

Section: Overview Of the Scanning Systemmentioning

confidence: 99%

Development of stereotactic radiosurgery using carbon beams (carbon-knife)

et al. 2018

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The aim of this research is to develop a stereotactic-radiosurgery (SRS) technique using carbon beams to treat small intracranial lesions; we call this device the carbon knife. A 2D-scanning method is adapted to broaden a pencil beam to an appropriate size for an irradiation field. A Mitsubishi slow extraction using third order resonance through a rf acceleration system stabilized by a feed-forward scanning beam using steering magnets with a 290 MeV/u initial beam energy was used for this purpose. Ridge filters for spread-out Bragg peaks (SOBPs) with widths of 5 mm, 7.5 mm, and 10 mm were designed to include fluence-attenuation effects. The collimator, which defines field shape, was used to reduce the lateral penumbra. The lateral-penumbra width at the SOBP region was less than 2 mm for the carbon knife. The penumbras behaved almost the same when changing the air gap, but on the other hand, increasing the range-shifter thickness mostly broadened the lateral penumbra. The physical-dose rates were approximate 6 Gy s and 4.5 Gy s for the 10 × 10 mm and 5 × 5 mm collimators, respectively.

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Section: Overview Of the Scanning Systemmentioning

confidence: 99%