TH‐D‐303A‐07: Dosimetric Impact of Rotational Setup Error in Stereotactic Body Frame Radiation Therapy (SBRT)

Purpose: SBRT uses specialized fixation devices to achieve high dose gradient with minimal margin, however setup errors cannot be totally eliminated. The dosimetric impact of rotational setup error is investigated in the context if translational shifts can compensate for it. Methods and Materials: T...

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Bibliographic Details
Published in:Medical Physics 2009-06, Vol.36 (6), p.2815-2815
Main Authors: Cao, M, Cardenes, H, Fakiris, A, Desrosiers, C, Slessinger, E, Langer, M, Das, I
Format: Article
Language:English
Subjects:
Anatomy
Cancer
Computed tomography
Dosimetry
Image processing
Liver
Lungs
Medical imaging
Radiation therapy
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Summary:Purpose: SBRT uses specialized fixation devices to achieve high dose gradient with minimal margin, however setup errors cannot be totally eliminated. The dosimetric impact of rotational setup error is investigated in the context if translational shifts can compensate for it. Methods and Materials: To simulate patient rotational setup errors, CT images of a phantom and actual clinical SBRT cases (liver: n=3, lung: n=3) were rotated around the body center using an in‐house image processing toolkit. The dosimetric impact of uncorrected roll was quantified by comparing the recalculated dose distribution to the original plan. Manual translational registration was then performed to match the target volumes on the rotated images to the original datasets to simulate translational correction. The original plan was then recalculated using the corrected CT datasets and the resultant dose distributions compared to the original ones. Results: The simulated rotation of phantom results in reduced dose‐volume coverage of CTV and PTV. While minimal for rotations
ISSN:0094-2405
2473-4209
DOI:10.1118/1.3182690