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

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 target refixation. Experimental and clinical results demonstrate the excellent efficacy of <2 min set-up time, themore » desired accuracy and precision of <1 mm in isocenter shifts, and <1 deg. in rotation.« less

Authors:
; ; ; ;  [1];  [2];  [2]
  1. Department of Radiation Oncology and Molecular Radiation Science, Johns Hopkins University School of Medicine (United States) and Department of Radiation Oncology, Henry Ford Health System, Detroit, Michigan 48202 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20775074
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 33; Journal Issue: 2; Other Information: DOI: 10.1118/1.2150778; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ACCURACY; ALIGNMENT; COMPUTER GRAPHICS; COMPUTERIZED TOMOGRAPHY; IMAGES; ITERATIVE METHODS; NMR IMAGING; ORAL CAVITY; PATIENTS; RADIOTHERAPY; ROTATION; TELEVISION CAMERAS

Citation Formats

Li Shidong, Liu Dezhi, Yin Gongjie, Zhuang Ping, Geng, Jason, Department of Radiation Oncology, Henry Ford Health System, Detroit, Michigan 48202 and Genex Technologies, Inc., Kensington, Maryland 20895, and Genex Technologies, Inc., Kensington, Maryland 20895. Real-time 3D-surface-guided head refixation useful for fractionated stereotactic radiotherapy. United States: N. p., 2006. Web. doi:10.1118/1.2150778.
Li Shidong, Liu Dezhi, Yin Gongjie, Zhuang Ping, Geng, Jason, Department of Radiation Oncology, Henry Ford Health System, Detroit, Michigan 48202 and Genex Technologies, Inc., Kensington, Maryland 20895, & Genex Technologies, Inc., Kensington, Maryland 20895. Real-time 3D-surface-guided head refixation useful for fractionated stereotactic radiotherapy. United States. doi:10.1118/1.2150778.
Li Shidong, Liu Dezhi, Yin Gongjie, Zhuang Ping, Geng, Jason, Department of Radiation Oncology, Henry Ford Health System, Detroit, Michigan 48202 and Genex Technologies, Inc., Kensington, Maryland 20895, and Genex Technologies, Inc., Kensington, Maryland 20895. Wed . "Real-time 3D-surface-guided head refixation useful for fractionated stereotactic radiotherapy". United States. doi:10.1118/1.2150778.
@article{osti_20775074,
title = {Real-time 3D-surface-guided head refixation useful for fractionated stereotactic radiotherapy},
author = {Li Shidong and Liu Dezhi and Yin Gongjie and Zhuang Ping and Geng, Jason and Department of Radiation Oncology, Henry Ford Health System, Detroit, Michigan 48202 and Genex Technologies, Inc., Kensington, Maryland 20895 and Genex Technologies, Inc., Kensington, Maryland 20895},
abstractNote = {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 target refixation. Experimental and clinical results demonstrate the excellent efficacy of <2 min set-up time, the desired accuracy and precision of <1 mm in isocenter shifts, and <1 deg. in rotation.},
doi = {10.1118/1.2150778},
journal = {Medical Physics},
number = 2,
volume = 33,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}