PMID: 16532957Mar 15, 2006Paper

Real-time 3D-surface-guided head refixation useful for fractionated stereotactic radiotherapy

Medical Physics
S LiJason Geng

Abstract

Accurate and precise head refixation in fractionated stereotactic radiotherapy has been achieved through alignment of real-time 3D-surface images with a reference surface image. The reference surface image is either a 3D optical surface image taken at simulation with the desired treatment position, or a CT/MRI-surface rendering in the treatment plan with corrections for patient motion during CT/MRI scans and partial volume effects. The real-time 3D surface images are rapidly captured by using a 3D video camera mounted on the ceiling of the treatment vault. Any facial expression such as mouth opening that affects surface shape and location can be avoided using a new facial monitoring technique. The image artifacts on the real-time surface can generally be removed by setting a threshold of jumps at the neighboring points while preserving detailed features of the surface of interest. Such a real-time surface image, registered in the treatment machine coordinate system, provides a reliable representation of the patient head position during the treatment. A fast automatic alignment between the real-time surface and the reference surface using a modified iterative-closest-point method leads to an efficient and robust surface-guided t...Continue Reading

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Citations

Mar 28, 2008·International Journal of Biomedical Imaging·R PosadaP Aletti
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Nov 19, 2019·Journal of Applied Clinical Medical Physics·Everardo Flores-MartinezGwe-Ya Kim
Oct 24, 2020·Journal of Applied Clinical Medical Physics·Elizabeth L CovingtonRichard A Popple

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