PMID: 8949771Jan 1, 1996Paper

The multileaf collimator for fast neutron therapy at Louvain-la-Neuve

Bulletin du cancer. Radiothérapie : journal de la Société française du cancer : organe de la société française de radiothérapie oncologique
Jean-Marc DenisA Wambersie

Abstract

The multileaf collimator of the fast neutron therapy facility at Louvain-la-Neuve is described, as well as some of the physics experiments performed in order to evaluate the attenuation of neutron beams in different materials and thus optimize the composition of the collimator leaves. The multileaf collimator consists of two sets of 22 leaves each, which can be moved independently. They are made of iron and their thickness is 95 cm. Seven borated polyethylene disks are located in the distal part of the leaves in order to absorb more efficiently the low-energy component of the neutron spectrum. The width of the leaves is 1 cm at their distal part. The leaves can move 11 cm outwards and 6 cm inwards from their reference position, and field sizes up to 25.7 x 24.8 cm, as well as irregular field shapes, can be obtained. The inner part of the leaves and their two sides are always focused on the target. The complete multileaf collimator can rotate around the beam axis, from -90 degrees to +90 degrees from the reference position. The width of the penumbra (80-20% isodoses) is 0.64 cm and 1.17 cm at the depth of the maximum buildup and at 10 cm in depth respectively, for a 10 x 10 cm field size. The collimator is adequate for the energ...Continue Reading

References

Aug 1, 1983·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·A BrahmeP Wootton

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Citations

May 27, 2009·Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine·M MikouJ Gueulette
Oct 26, 2000·Physics in Medicine and Biology·J Söderberg, G A Carlsson

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