Fiber-optic detector for real time dosimetry of a micro-planar x-ray beam.

Journal Article (Journal Article)


Here, the authors describe a dosimetry measurement technique for microbeam radiation therapy using a nanoparticle-terminated fiber-optic dosimeter (nano-FOD).


The nano-FOD was placed in the center of a 2 cm diameter mouse phantom to measure the deep tissue dose and lateral beam profile of a planar x-ray microbeam.


The continuous dose rate at the x-ray microbeam peak measured with the nano-FOD was 1.91 ± 0.06 cGy s(-1), a value 2.7% higher than that determined via radiochromic film measurements (1.86 ± 0.15 cGy s(-1)). The nano-FOD-determined lateral beam full-width half max value of 420 μm exceeded that measured using radiochromic film (320 μm). Due to the 8° angle of the collimated microbeam and resulting volumetric effects within the scintillator, the profile measurements reported here are estimated to achieve a resolution of ∼0.1 mm; however, for a beam angle of 0°, the theoretical resolution would approach the thickness of the scintillator (∼0.01 mm).


This work provides proof-of-concept data and demonstrates that the novel nano-FOD device can be used to perform real-time dosimetry in microbeam radiation therapy to measure the continuous dose rate at the x-ray microbeam peak as well as the lateral beam shape.

Full Text

Duke Authors

Cited Authors

  • Belley, MD; Stanton, IN; Hadsell, M; Ger, R; Langloss, BW; Lu, J; Zhou, O; Chang, SX; Therien, MJ; Yoshizumi, TT

Published Date

  • April 2015

Published In

Volume / Issue

  • 42 / 4

Start / End Page

  • 1966 - 1972

PubMed ID

  • 25832087

Pubmed Central ID

  • PMC4376762

Electronic International Standard Serial Number (EISSN)

  • 2473-4209

International Standard Serial Number (ISSN)

  • 0094-2405

Digital Object Identifier (DOI)

  • 10.1118/1.4915078


  • eng