Reconstruction and navigation system for intraoperative brachytherapy using the flab technique for colorectal tumor bed irradiation

Strassmann, G; Walter, S; Kolotas, C; Heyd, R; Baltas, D; Debertshauser, D; Nier, H; Tonus, C; Sakas, G; Zamboglou, N

dc.contributor.author	Strassmann, G	en
dc.contributor.author	Walter, S	en
dc.contributor.author	Kolotas, C	en
dc.contributor.author	Heyd, R	en
dc.contributor.author	Baltas, D	en
dc.contributor.author	Debertshauser, D	en
dc.contributor.author	Nier, H	en
dc.contributor.author	Tonus, C	en
dc.contributor.author	Sakas, G	en
dc.contributor.author	Zamboglou, N	en
dc.date.accessioned	2014-03-01T01:15:51Z
dc.date.available	2014-03-01T01:15:51Z
dc.date.issued	2000	en
dc.identifier.issn	0360-3016	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13771
dc.subject	colorectal cancer	en
dc.subject	intraoperative HDR brachytherapy	en
dc.subject	treatment planning	en
dc.subject	navigation	en
dc.subject.classification	Oncology	en
dc.subject.classification	Radiology, Nuclear Medicine & Medical Imaging	en
dc.subject.other	RECURRENT RECTAL-CANCER	en
dc.subject.other	RADIATION-THERAPY	en
dc.subject.other	LOCALLY RECURRENT	en
dc.subject.other	MANAGEMENT	en
dc.title	Reconstruction and navigation system for intraoperative brachytherapy using the flab technique for colorectal tumor bed irradiation	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0360-3016(00)00492-2	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0360-3016(00)00492-2	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Purpose: To present the development of a new navigation and reconstruction system based on an electromagnetic free-hand tracker and on CT imaging for treatment planning of intraoperative high-dose-rate brachytherapy (IORT-HDRB) in the sacral region. Our aim is to improve accuracy and to enable individualized treatment planning and dose documentation to be performed for IORT-HDRB using a flab technique. Methods and Materials: The material consists of an electromagnetic 3D tracker system, a PC workstation with Microsoft Windows NT 4.0 operating system, and a recognition program for continuous speech. In addition, we designed an external reference system constructed of titanium and Perspex, which is positioned in the pelvis, and a special digitizer pen for reconstruction of the flab geometry. The flab design incorporates a series of silicon 10-mm-diameter spherical pellets. Measurements were made with a pelvic phantom in order to study the accuracy of the system. The reconstruction results are stored and can be exported,ia network or floppy to our different treatment planning systems. Results: Our results for the reconstruction of a flab with six catheters and a total of 100 spherical pellets give mean errors in the range (2.5 +/- 0.6) mm to (3.5 +/- 0.8) mm depending on the positions of the pelvic phantom and transmitter relative to the operation table. These errors are calculated by comparing the reconstruction results of our system with those using a CT-based reconstruction of the flab geometry. For the accuracy of the navigation system for the pelvic phantom, we obtained mean errors in the range (2.2 +/- 0.7) mm to (3.1 +/- 1.0) mm, Conclusions: The new system we have developed enables navigation and reconstruction within the surgical environment with a clinically acceptable level of accuracy. It offers the possibility of individualized treatment planning and effective documentation of the 3D dose distribution in IORT-HDRB using a flab technique. (C) 2000 Elsevier Science Inc.	en
heal.publisher	ELSEVIER SCIENCE INC	en
heal.journalName	INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS	en
dc.identifier.doi	10.1016/S0360-3016(00)00492-2	en
dc.identifier.isi	ISI:000088202600019	en
dc.identifier.volume	47	en
dc.identifier.issue	5	en
dc.identifier.spage	1323	en
dc.identifier.epage	1329	en