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Treatment Possibility of RapidArc Patients on Different Linacs without New Dosimetry by P. Fenoglietto; N. Aillères; S. Siméon; J. Dubois; D. Azria is a Medicine article available to read on EtoBox.

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CTV2 was the contrast enhancing tumor with 15 mm margin and CTV3 was the Vasogenic Edema plus 5 mm margins. As patients were irradiated on tomotherapy unit with daily MV-CT image guidance, no additional margins was added to the CTV and in consequence the PTV's (Planning Target Volumes) were equal to the CTV's. A hypofractionated and accelerated regimen of radiation was used and evaluated with the following prescription: PTV1 received a total dose of 60 Gy in 15 fractions (4 Gy/fraction), PTV2 received a dose of 48 Gy in 15 fractions (3.2 Gy/fraction) and PTV3 received a dose of 40.5 Gy in 15 fractions (2.7Gy/fraction). Normal structures such as Brain, Brainstem, Optic Chiasm, Optic Nerves, Orbit and Lenses were defined. The late effects ''dose equivalent 2 Gy per fraction'' of this hypofractionated regimen have been estimated by using the linear quadratic model. Dosimetric data are reported in a descriptive way using the median values (min-max). Homogeneity index (HI: dose max/dose prescribed), coverage index (CI: dose min/dose prescribed) and a conformation number using the Van't Riet formula have been calculated for the PTV1. Results: The median volume of PTV 60 was 54 cc (12.1-1

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Author

P. Fenoglietto; N. Aillères; S. Siméon; J. Dubois; D. Azria

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0360-3016)

Published

2010

Language

EN

Field

Medicine (Health Sciences)