4.6 Article

Design and modeling of a Laue lens for radiation therapy with hard x-ray photons

期刊

PHYSICS IN MEDICINE AND BIOLOGY
卷 66, 期 24, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1361-6560/ac3840

关键词

silicon Laure components; silicon pore optics; radiotherapy; hard x-rays; focused beam; focusing optics

资金

  1. Science Foundation Ireland (SFI) [11/RFP.1/AST/3188, 16/IFA/4320]
  2. SFI [11/RFP.1/AST/3188, 17/CDA/4723, 19/FFP/6777]
  3. EU [871 158]
  4. Science Foundation Ireland (SFI) [16/IFA/4320, 11/RFP.1/AST/3188] Funding Source: Science Foundation Ireland (SFI)

向作者/读者索取更多资源

The study presents a novel optical system for radiation therapy using a Laue lens with Silicon Laue components that concentrate photons to achieve high dose rates at the focal area, leading to simpler and cost-effective treatment units. Monte Carlo simulations show high dose deposition rates in a cylindrical volume with significant dose ratio differences between the surface and the focus. Ongoing work focuses on improving dose rates using newer crystal technologies.
We have designed and modeled a novel optical system composed of a Laue lens coupled to an x-ray tube that produces a focused beam in an energy range near 100 keV (lambda = 12.4 picometer). One application of this system is radiation therapy where it could enable treatment units that are considerably simpler and lower in cost than present technologies relying on linear accelerators. The Laue lens is made of Silicon Laue components which exploit the silicon pore optics technology. The lens concentrates photons to a small region thus allowing high dose rates at the focal area with very much lower dose rates at the skin and superficial regions. Monte Carlo simulations with Geant4 indicate a dose deposition rate of 0.2 Gy min(-1) in a cylindrical volume of 0.7 mm diameter and 10 mm length, and a dose ratio of 72 at the surface (skin) compared to the focus placed 10 cm within a water phantom. Work is ongoing to newer generation crystal technologies to increase dose rate.

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