Porównanie rozkładu dawki w objętości PTV przy zastosowaniu bolusa wodnego, gumowego i żelowego

Abstract

Author(s): K Patyra, M Mazurkiewicz

Introduction: A comparison of the distributions of the doses in 95% and 100% of planning target volume (PTV) with use of either rubber or jelly or water bolus was made in the study. Water bolus was attached to a fixing frame. Rubber and jelly boluses were fixed typically.

Material and methods: The study involved 23 patients scheduled for radical radiotherapy in the Dept. of Radiotherapy, The Lublin Lands’ Center of Oncology between December 2007 – March 2008. Each patient had a CT imaging of the planned -to-treat region performed with three types of the bolus. The PTV regions were then marked on the CT images and consequently loaded to the radiation planning system. The evaluation of dose distribution in PTV was done with an analysis of the dose histograms of each bolus.

Results: Using a jelly bolus 83% of the planned dose was available in 95% volume of PTV, rubber bolus allowed for 87% of the planned dose in 95% volume of PTV, while application of water bolus gave 98% of the planned dose in 95% volume of PTV.

Conclusions: Application of water bolus in radiotherapy of the head and neck region allows to achieve a significantly higher homogeneity of the dose in both 95% and 100% volume of PTV, in comparison to rubber and jelly boluses.

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