Document Detail


3D optoelectronic analysis of interfractional patient setup variability in frameless extracranial stereotactic radiotherapy.
MedLine Citation:
PMID:  16198068     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: To investigate size and frequency of interfractional patient setup variability in hypofractionated stereotactic extracranial radiotherapy. METHODS AND MATERIALS: Infrared optical 3D tracking of surface markers was applied to quantify setup variability on 51 patients. Isocenter position repeatability was assessed by means of frameless anatomic calibration and was compared with portal image evaluation. Specific data analysis allowed for compensation of patients' breathing movements and for separation of the effects of operator-dependent misalignments and respiration-induced displacements. Effects of patient position (supine vs. prone) and treatment table configuration were investigated. RESULTS: Patient positioning assisted by the optical tracking device allowed reducing displacements of surface control points within the 3-mm range. Errors in isocenter localization were in the range of a few millimeters. This was in agreement with the portal image evaluation. Breathing motion introduced appreciable errors, which increased control points and isocenter 3D variability. This effect was significantly higher than those related to other investigated factors. CONCLUSIONS: The role of infrared optical tracking devices for patient positioning is assessed on a large patient population. Their use in the frame of high-precision radiotherapy is emphasized by the application of related methodologies for breathing phase detection and frameless isocenter localization.
Authors:
Guido Baroni; Cristina Garibaldi; Marco Riboldi; Maria F Spadea; Gianpiero Catalano; Barbara Tagaste; Giampiero Tosi; Roberto Orecchia; Antonio Pedotti
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Publication Detail:
Type:  Journal Article     Date:  2005-09-28
Journal Detail:
Title:  International journal of radiation oncology, biology, physics     Volume:  64     ISSN:  0360-3016     ISO Abbreviation:  Int. J. Radiat. Oncol. Biol. Phys.     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-01-17     Completed Date:  2006-03-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7603616     Medline TA:  Int J Radiat Oncol Biol Phys     Country:  United States    
Other Details:
Languages:  eng     Pagination:  635-42     Citation Subset:  IM    
Affiliation:
Department of Bioengineering, Politecnico di Milano University, Milan, Italy. guido.baroni@polimi.it
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MeSH Terms
Descriptor/Qualifier:
Abdominal Neoplasms / radiotherapy*
Calibration
Dose Fractionation
Humans
Infrared Rays
Pelvic Neoplasms / radiotherapy*
Prone Position
Reproducibility of Results
Respiration
Stereotaxic Techniques*
Supine Position
Thoracic Neoplasms / radiotherapy*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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