Registration of electronic portal images for patient
set-up verification

dc.contributor.author	Ματσόπουλος, Γεώργιος Κ.	el
dc.contributor.author	Ασβεστάς, Παντελής Α.	el
dc.contributor.author	Δελήμπασης, Κωνσταντίνος Κ.	el
dc.contributor.author	Κουλουλίας, Βασίλειος	el
dc.contributor.author	Ουζούνογλου, Νικόλαος Κ.	el
dc.date.accessioned	2015-01-14T11:53:48Z
dc.date.available	2015-01-14T11:53:48Z
dc.date.issued	2015-01-14
dc.identifier.uri	http://hdl.handle.net/11400/4033
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.source	http://iopscience.iop.org/	en
dc.subject	Electronic portal
dc.subject	Digitally reconstructed radiographs
dc.subject	Ηλεκτρονική πύλη
dc.subject	Ψηφιακή ανακατασκευή ακτινογραφίας
dc.title	Registration of electronic portal images for patient set-up verification	en
heal.type	journalArticle
heal.classification	Medicine
heal.classification	Medical physics
heal.classification	Ιατρική
heal.classification	Ιατρική φυσική
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh00006614
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85083001
heal.classificationURI	N/A-Ιατρική
heal.classificationURI	N/A-Ιατρική φυσική
heal.contributorName	Καραΐσκος, Παντελής	el
heal.contributorName	Σάνδηλος, Παναγιώτης	el
heal.identifier.secondary	doi:10.1088/0031-9155/49/14/018
heal.language	en
heal.access	free
heal.recordProvider	Τ.Ε.Ι. Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε.	el
heal.publicationDate	2004
heal.bibliographicCitation	Matsopoulos, G., Asvestas, P., Delibasis, K., Kouloulias, V., Uzunoglu, N. et al. (July 2004). Registration of electronic portal images for patient set-up verification. Physics in Medicine and BiologyInstitute of Physics and Engineering in Medicine. 49(14). pp. 3279-3289. IOP Publishing Ltd. Available from: http://iopscience.iop.org	en
heal.abstract	Images acquired from an electronic portal imaging device are aligned with digitally reconstructed radiographs (DRRs) or other portal images to verify patient positioning during radiation therapy. Most of the currently available computer aided registration methods are based on the manual placement of corresponding landmarks. The purpose of the paper is twofold: (a) the establishment of a methodology for patient set-up verification during radiotherapy based on the registration of electronic portal images, and (b) the evaluation of the proposed methodology in a clinical environment. The estimation of set-up errors, using the proposed methodology, can be accomplished by matching the portal image of the current fraction of the treatment with the portal image of the baseline treatment (reference portal image) using a nearly automated technique. The proposed registration method is tested on a number of phantom data as well as on data from four patients. The phantom data included portal images that corresponded to various positions of the phantom on the treatment couch. For each patient, a set of 30 portal images was used. For the phantom data (for both transverse and lateral portal images), the maximum absolute deviations of the translational shifts were within 1.5 mm, whereas the in-plane rotation angle error was less than 0.5°. The two-way Anova revealed no statistical significant variability both within observer and between-observer measurements (P > 0.05). For the patient data, the mean values obtained with manual and the proposed registration methods were within 0.5 mm. In conclusion, the proposed registration method has been incorporated within a system, called ESTERR-PRO. Its image registration capability achieves high accuracy and both intra- and inter-user reproducibility. The system is fully operational within the Radiotherapy Department of 'HYGEIA' Hospital in Athens and it could be easily installed in any other clinical environment since it requires standardized hardware specifications and minimal human intervention.	en
heal.publisher	IOP Publishing Ltd	en
heal.journalName	Physics in Medicine and BiologyInstitute of Physics and Engineering in Medicine	en
heal.journalType	peer-reviewed
heal.fullTextAvailability	true