New technology enables high precision multislit collimators for microbeam radiation therapy

Bräuer-Krisch, E; Requardt, H; Brochard, T; Berruyer, G; Renier, M; Laissue, J A; Bravin, A (2009). New technology enables high precision multislit collimators for microbeam radiation therapy. Review of scientific instruments, 80(7), p. 74301. Woodbury, N.Y.: American Institute of Physics 10.1063/1.3170035

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During the past decade microbeam radiation therapy has evolved from preclinical studies to a stage in which clinical trials can be planned, using spatially fractionated, highly collimated and high intensity beams like those generated at the x-ray ID17 beamline of the European Synchrotron Radiation Facility. The production of such microbeams typically between 25 and 100 microm full width at half maximum (FWHM) values and 100-400 microm center-to-center (c-t-c) spacings requires a multislit collimator either with fixed or adjustable microbeam width. The mechanical regularity of such devices is the most important property required to produce an array of identical microbeams. That ensures treatment reproducibility and reliable use of Monte Carlo-based treatment planning systems. New high precision wire cutting techniques allow the fabrication of these collimators made of tungsten carbide. We present a variable slit width collimator as well as a single slit device with a fixed setting of 50 microm FWHM and 400 microm c-t-c, both able to cover irradiation fields of 50 mm width, deemed to meet clinical requirements. Important improvements have reduced the standard deviation of 5.5 microm to less than 1 microm for a nominal FWHM value of 25 microm. The specifications of both devices, the methods used to measure these characteristics, and the results are presented.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Pathology

UniBE Contributor:

Laissue, Jean

ISSN:

0034-6748

ISBN:

19655968

Publisher:

American Institute of Physics

Language:

English

Submitter:

Factscience Import

Date Deposited:

04 Oct 2013 15:08

Last Modified:

04 May 2014 23:21

Publisher DOI:

10.1063/1.3170035

PubMed ID:

19655968

Web of Science ID:

000268615700033

URI:

https://boris.unibe.ch/id/eprint/30013 (FactScience: 165768)

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