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Quantification of Delivered IMRT Dose Distributions for Mobile Targets by Forster, K.M.; Opp, D.; Zhang, G.; Latifi, K.; Pritz, J.; Shridhar, R.; Dilling, T.; Hoffe, S.; Feygelman, V. is a Medicine article available to read on EtoBox.

What is Quantification of Delivered IMRT Dose Distributions for Mobile Targets about?

retrospective dose calculation on daily volumetric CBCT image sets while accounting for alignment shifts based on MV portal imaging. Materials/Methods: Daily MV planar images were acquired for two H&N patients with the electron apertures in place. The range of electron energies used was 9-15 MeV with cone sizes in the range of 6 x 6 to 15 x 15 cm 2 cones. By comparing positions of bony structure landmarks from MV images to digitally reconstructed radiographs (DRRs), the magnitude of aperture shifts in the coronal plane is determined. Volumetric imaging using the treatment machine on-board imager (CBCT) was also acquired to determine the quality of fit of the bolus device on patient skin and the magnitude of tilt of the device in the sagittal and axial planes with respect to beam axis. To determine the effect of bolus device tilt and misalignment on PTV coverage, daily CBCT images were fused with the reference CT image sets and contours are transferred from the reference CT to the CBCTs. Density overrides of both image sets were performed to avoid CT number dose calculation dependencies. Results: Analysis of daily shifts based on MV imaging, beam aperture misalignment with the inten

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Author

Forster, K.M.; Opp, D.; Zhang, G.; Latifi, K.; Pritz, J.; Shridhar, R.; Dilling, T.; Hoffe, S.; Feygelman, V.

Publisher

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

Published

2010

Language

EN

Field

Medicine (Health Sciences)