title: Dose distribution of a 125 keV mean energy microplanar x-ray beam for basic studies on microbeam radiotherapy.
abstract: A multislit collimator was designed and fabricated for basic studies on microbeam radiation therapy (MRT) with an x-ray energy of about 100 keV. It consists of 30 slits that are 25 microm high, 30 mm wide, and 5 mm thick in the beam direction. The slits were made of 25 microm-thick polyimide sheets that were separated by 175 microm-thick tungsten sheets. The authors measured the dose distribution of a single microbeam with a mean energy of 125 keV by a scanning slit method using a phosphor coupled to a charge coupled device camera and found that the ratios of the dose at the center of a microbeam to that at midpositions to adjacent slits were 1050 and 760 for each side of the microbeam. This dose distribution was well reproduced by the Monte Carlo simulation code PHITS.
authors.affiliation: National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555, Japan. ohno@nirs.go.jp
authors.forename: Yumiko
authors.initials: Y
authors.lastname: Ohno
authors.forename: Masami
authors.initials: M
authors.lastname: Torikoshi
authors.forename: Masao
authors.initials: M
authors.lastname: Suzuki
authors.forename: Keiji
authors.initials: K
authors.lastname: Umetani
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Imai
authors.forename: Kentaro
authors.initials: K
authors.lastname: Uesugi
authors.forename: Naoto
authors.initials: N
authors.lastname: Yagi
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004867:Equipment Design; D006801:Humans; D009010:Monte Carlo Method; D010758:Phosphorus / Q000737:chemistry; D017785:Photons; D011874:Radiometry / Q000379:methods; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods; D020266:Radiotherapy, Conformal / Q000295:instrumentation*; D012542:Scattering, Radiation; D012984:Software; D017356:Synchrotrons; D014414:Tungsten / Q000737:chemistry; D014965:X-Rays
chemical_list: D010758:Phosphorus; D014414:Tungsten