Polymer gel dosimetry for synchrotron stereotactic radiotherapy and iodine dose-enhancement measurements. - Inserm - Institut national de la santé et de la recherche médicale Accéder directement au contenu
Article Dans Une Revue Physics in Medicine and Biology Année : 2007

Polymer gel dosimetry for synchrotron stereotactic radiotherapy and iodine dose-enhancement measurements.

Résumé

Synchrotron stereotactic radiotherapy (SSR) is a radiotherapy technique that makes use of the interactions of monochromatic low energy x-rays with high atomic number (Z) elements. An important dose-enhancement can be obtained if the target volume has been loaded with a sufficient amount of a high-Z element, such as iodine. In this study, we compare experimental dose measurements, obtained with normoxic polymer gel (nPAG), with Monte Carlo computations. Gels were irradiated within an anthropomorphic head phantom and were read out by magnetic resonance imaging. The dose-enhancement due to the presence of iodine in the gel (iodine concentration: 5 and 10 mg ml(-1)) was measured at two radiation energies (35 and 80 keV) and was compared to the calculated factors. nPAG dosimetry was shown to be efficient for measuring the sharp dose gradients produced by SSR. The agreement between 3D gel dosimetry and calculated dose distributions was found to be within 4% of the dose difference criterion and a distance to agreement of 2.1 mm for 80% of the voxels. Polymer gel doped with iodine exhibited higher sensitivity, in good agreement with the calculated iodine-dose enhancement. We demonstrate in this preliminary study that iodine-doped nPAG could be used for measuring in situ dose distributions for iodine-enhanced SSR treatment.

Dates et versions

inserm-00381459 , version 1 (06-05-2009)

Identifiants

Citer

Caroline Boudou, Irène Troprès, J. Rousseau, Laurent Lamalle, Jean-François Adam, et al.. Polymer gel dosimetry for synchrotron stereotactic radiotherapy and iodine dose-enhancement measurements.. Physics in Medicine and Biology, 2007, 52 (16), pp.4881-92. ⟨10.1088/0031-9155/52/16/011⟩. ⟨inserm-00381459⟩

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