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- W2092847251 abstract "Abstract Summary: The new polymer gel dosimeter, based on the modification of the VIPAR gel composition, is described for the purpose of radiation dose distribution measurement in radiotherapy. It features increased concentration of the two VIPAR substrates: N‐ vinylpyrrolidone (8%) and gelatine (7.5%) ( N,N ′‐methylenebisacrylamide was maintained at 4%), and the addition of copper sulphate (0.0008%) and ascorbic acid (0.007%) in order to facilitate the preparation through elimination of the need for deoxygenation of the gel. Following the exposure to ionizing radiation, polymerisation and cross‐linking of the new gel monomers occurs retaining the spatial distribution of absorbed dose and causing opacity of the gel. Quantitative parameters of the new gel dose response were studied using magnetic resonance imaging to relate polymerisation induced physicochemical changes of the gel to dose. The dose threshold is found significantly lower than that of the original VIPAR gel. The linear part of measured spin‐spin relaxation rate R 2 (D) ( = 1/T 2 (D)) reaches up to 35 Gy. Its slope and an intercept are slightly higher relative to the original VIPAR. The efficiency of the new polymer gel‐magnetic resonance imaging dosimeter was also tested for dose verification of a 3D dose distribution planned by a commercially available treatment planning software (Eclipse External Beam v.6.5) and delivered by a 6 MV medical linear accelerator. The new polymer gel is proposed to be called, VIPAR nd (after VIPAR‐normoxic‐double)." @default.
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- W2092847251 date "2007-08-01" @default.
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- W2092847251 title "On the Development of the VIPAR Polymer Gel Dosimeter for Three‐Dimensional Dose Measurements" @default.
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- W2092847251 doi "https://doi.org/10.1002/masy.200750850" @default.
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