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- W1975381585 abstract "Introduction Two Lung Stereotactic techniques with tumor control position during irradiation are compared. Material and methods The Rapidarc technology allows to homogenize the dose in the PTV while reducing the dose delivered in the OAR. For Lung stereotactic treatment, it creates a decrease of the average dose in the ITV not in compliance with the recommendations and the practices based on an important heterogeneity of dose in the target volume. Besides, the leafs movement does not allow any more the ‘‘on-line” follow-up by the portal imager made during the previous treatments realized by means of static fields. An kV intrafraction imaging technique (IMR) available on Truebeam allows to deliver these treatments while following in a continuous way the tumor position in every respiratory cycle. We analyse the dosimetrics results obtained whith an approach who consist of modulate the homogeneity of dose in the PTV so that the prescription is similar to the previous treatments realized by means of static fields. Results The concerned populations are similar with average volumes (±standard deviation) of PTV of ±9 (15) cc in Rapidarc (20 patients) and 17 (11) cc in static fields (35 patients). The dose heterogeneity imposed inside the PTV generates an increase of 5 % of the conformity index (Viso100 %/VPTV100 %) who remains however slightly better in RA, 1.15 (±0.1) vs 1.17 (±0.1). The average dose in the ITV, 117 (±3)% and in the PTV, 113 (±3)% are identical. The maximal doses in organs at risks are globally reduced by 20% with the possibility to reach more than 40% on the most critical volume. Conclusion A prescription on the average dose in the ITV associated with a coverage of the PTV by an isodose superior to 99% allows in Rapidarc to manage the heterogeneity of dose wished in the target volumes. The intra fraction follow-up by imaging kV without implanted markers allows to control the target position during the duration of the session." @default.
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- W1975381585 date "2013-06-01" @default.
- W1975381585 modified "2023-10-10" @default.
- W1975381585 title "Lung stereotaxy in rapidarc with intra fraction imaging without internal marker" @default.
- W1975381585 doi "https://doi.org/10.1016/j.ejmp.2013.08.024" @default.
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