Navigation system for interstitial brachytherapy

Strassmann, G; Kolotas, C; Heyd, R; Walter, S; Baltas, D; Martin, T; Vogt, H; Ioannidis, G; Sakas, G; Zamboglou, N

dc.contributor.author	Strassmann, G	en
dc.contributor.author	Kolotas, C	en
dc.contributor.author	Heyd, R	en
dc.contributor.author	Walter, S	en
dc.contributor.author	Baltas, D	en
dc.contributor.author	Martin, T	en
dc.contributor.author	Vogt, H	en
dc.contributor.author	Ioannidis, G	en
dc.contributor.author	Sakas, G	en
dc.contributor.author	Zamboglou, N	en
dc.date.accessioned	2014-03-01T01:15:44Z
dc.date.available	2014-03-01T01:15:44Z
dc.date.issued	2000	en
dc.identifier.issn	0167-8140	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13690
dc.subject	interstitial brachytherapy	en
dc.subject	navigation system	en
dc.subject	needle positioning	en
dc.subject.classification	Oncology	en
dc.subject.classification	Radiology, Nuclear Medicine & Medical Imaging	en
dc.subject.other	RECONSTRUCTION	en
dc.title	Navigation system for interstitial brachytherapy	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0167-8140(00)00209-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0167-8140(00)00209-7	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Purpose: To develop a computed tomography (CT) based electromagnetic navigation system for interstitial brachytherapy. This is especially designed for situations when needles have to be positioned adjacent to or within critical anatomical structures. In such instances interactive 3D visualisation of the needle positions is essential. Methods and materials: The material consisted of a Polhemus electromagnetic 3D digitizer, a Pentium 200 MHz laptop and a Voice recognition for continuous speech. In addition, we developed an external reference system constructed of Perspex which could be positioned above the tumour region and attached to the patient using a non-invasive fixation method. A specially designed needle holder and patient bed were also developed. Measurements were made on a series of phantoms in order to study the efficacy and accuracy of the navigation system. Results: The mean navigation accuracy of positioning the 20.0 cm length metallic needles within the phantoms was in the range 2.0-4.1 mm with a maximum of 5.4 mm. This is an improvement on the accuracy of a CT-guided technique which was in the range 6.1-11.3 mm with a maximum of 19.4 mm. The mean reconstruction accuracy of the implant geometry was 3.2 mm within a non-ferromagnetic environment. We found that although the needles were metallic this did not have a significant influence. We also found for our experimental setups that the CT table and operation table non-ferromagnetic parts had no significant influence on the navigation accuracy. Conclusions: This navigation system will be a very useful clinical tool for interstitial brachytherapy applications, particularly when critical structures have to be avoided. It also should provide a significant improvement on our existing technique. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCI IRELAND LTD	en
heal.journalName	RADIOTHERAPY AND ONCOLOGY	en
dc.identifier.doi	10.1016/S0167-8140(00)00209-7	en
dc.identifier.isi	ISI:000088159100008	en
dc.identifier.volume	56	en
dc.identifier.issue	1	en
dc.identifier.spage	49	en
dc.identifier.epage	57	en