Document Detail

3D optoelectronic analysis of interfractional patient setup variability in frameless extracranial stereotactic radiotherapy.
MedLine Citation:
PMID:  16198068     Owner:  NLM     Status:  MEDLINE    
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.
Guido Baroni; Cristina Garibaldi; Marco Riboldi; Maria F Spadea; Gianpiero Catalano; Barbara Tagaste; Giampiero Tosi; Roberto Orecchia; Antonio Pedotti
Related Documents :
23936818 - Transcriptomic profiling of the four adenosine receptors in human leukocytes of heart f...
9803048 - Dyspnea in the advanced cancer patient.
20639238 - Cerebrovascular accidents in adult patients with congenital heart disease.
7072588 - Clinical confirmation of ecg criteria for left atrial rhythm.
15792678 - Incidence of heparin-pf4 complex antibody formation and heparin-induced thrombocytopeni...
23364388 - Mild cognitive impairment in moderate to severe copd: a preliminary study.
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    
Department of Bioengineering, Politecnico di Milano University, Milan, Italy.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Abdominal Neoplasms / radiotherapy*
Dose Fractionation
Infrared Rays
Pelvic Neoplasms / radiotherapy*
Prone Position
Reproducibility of Results
Stereotaxic Techniques*
Supine Position
Thoracic Neoplasms / radiotherapy*

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

Previous Document:  Distinctive clinical course and pattern of relapse in adolescents with medulloblastoma.
Next Document:  Prognostic factors predicting functional outcomes, recurrence-free survival, and overall survival af...