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Fig. 4 | Radiation Oncology

Fig. 4

From: ITV versus mid-ventilation for treatment planning in lung SBRT: a comparison of target coverage and PTV adequacy by using in-treatment 4D cone beam CT

Fig. 4

a Histogram of the intrafraction baseline displacements observed during beam delivery (vector length) indicating that in 80% of fractions, the baseline displacements were smaller than 6 mm. An analysis of the impact of these baseline displacements on the target coverage is reported in (b) and (c) for the ITV-based PTV and the MidV-based PTV, respectively. d Histogram of the differences in motion amplitude vectors between treatment and planning shows that in 81% of fractions, the motion amplitude vector is consistent with that of planning at +/−4 mm. The impact of these motion amplitude differences on target coverage is reported in (e) and (f) for the ITV-based PTV and the MidV-based PTV, respectively

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Radiation Oncology

ISSN: 1748-717X

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