Pencil beam scanning dosimetry for large animal irradiation

Liyong Lin, Timothy D. Solberg, Alexandro Carabe, James E. McDonough, Eric Diffenderfer, Jenine K. Sanzari, Ann R. Kennedy, Keith Cengel

Research output: Contribution to journalArticle

Abstract

The space radiation environment imposes increased dangers of exposure to ionizing radiation, particularly during a solar particle event. These events consist primarily of low-energy protons that produce a highly inhomogeneous depth-dose distribution. Here we describe a novel technique that uses pencil beam scanning at extended source-to-surface distances and range shifter (RS) to provide robust but easily modifiable delivery of simulated solar particle event radiation to large animals. Thorough characterization of spot profiles as a function of energy, distance and RS position is critical to accurate treatment planning. At 105 MeV, the spot sigma is 234 mm at 4800 mm from the isocentre when the RS is installed at the nozzle. With the energy increased to 220 MeV, the spot sigma is 66 mm. At a distance of 1200 mm from the isocentre, the Gaussian sigma is 68 mm and 23 mm at 105 MeV and 220 MeV, respectively, when the RS is located on the nozzle. At lower energies, the spot sigma exhibits large differences as a function of distance and RS position. Scan areas of 1400 mm (superior-inferior) by 940 mm (anterior-posterior) and 580 mm by 320 mm are achieved at the extended distances of 4800 mm and 1200 mm, respectively, with dose inhomogeneity <2%. To treat large animals with a more sophisticated dose distribution, spot size can be reduced by placing the RS closer than 70 mm to the surface of the animals, producing spot sigmas below 6 mm.

Original languageEnglish (US)
Pages (from-to)855-861
Number of pages7
JournalJournal of Radiation Research
Volume55
Issue number5
DOIs
StatePublished - Sep 1 2014

Fingerprint

pencil beams
Solar Activity
dosimeters
animals
irradiation
scanning
Radiation
dosage
nozzles
Ionizing Radiation
Protons
extraterrestrial radiation
proton energy
ionizing radiation
hazards
planning
energy
delivery
inhomogeneity
radiation

Keywords

  • large animal
  • pencil beam scanning
  • proton therapy
  • solar particle event
  • total body irradiation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiation
  • Health, Toxicology and Mutagenesis

Cite this

Lin, L., Solberg, T. D., Carabe, A., McDonough, J. E., Diffenderfer, E., Sanzari, J. K., ... Cengel, K. (2014). Pencil beam scanning dosimetry for large animal irradiation. Journal of Radiation Research, 55(5), 855-861. https://doi.org/10.1093/jrr/rru029

Pencil beam scanning dosimetry for large animal irradiation. / Lin, Liyong; Solberg, Timothy D.; Carabe, Alexandro; McDonough, James E.; Diffenderfer, Eric; Sanzari, Jenine K.; Kennedy, Ann R.; Cengel, Keith.

In: Journal of Radiation Research, Vol. 55, No. 5, 01.09.2014, p. 855-861.

Research output: Contribution to journalArticle

Lin, L, Solberg, TD, Carabe, A, McDonough, JE, Diffenderfer, E, Sanzari, JK, Kennedy, AR & Cengel, K 2014, 'Pencil beam scanning dosimetry for large animal irradiation', Journal of Radiation Research, vol. 55, no. 5, pp. 855-861. https://doi.org/10.1093/jrr/rru029
Lin L, Solberg TD, Carabe A, McDonough JE, Diffenderfer E, Sanzari JK et al. Pencil beam scanning dosimetry for large animal irradiation. Journal of Radiation Research. 2014 Sep 1;55(5):855-861. https://doi.org/10.1093/jrr/rru029
Lin, Liyong ; Solberg, Timothy D. ; Carabe, Alexandro ; McDonough, James E. ; Diffenderfer, Eric ; Sanzari, Jenine K. ; Kennedy, Ann R. ; Cengel, Keith. / Pencil beam scanning dosimetry for large animal irradiation. In: Journal of Radiation Research. 2014 ; Vol. 55, No. 5. pp. 855-861.
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