Design and evaluation of Overhauser enhanced MRI visible markers

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Joensuu, Raimo
dc.date.accessioned 2012-02-10T09:51:41Z
dc.date.available 2012-02-10T09:51:41Z
dc.date.issued 2000-10-27
dc.identifier.isbn 951-22-5202-3
dc.identifier.issn 1456-1174
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2271
dc.description.abstract This thesis deals with the theoretical principles, design and construction of a small-sized marker which is visible in magnetic resonance images. The nuclear magnetic resonance signal emitted by the marker is enhanced by the use of the Overhauser phenomenon. Different marker configurations were designed and constructed. A point-like marker was coupled to the feeding cable by loop and loop-gap geometries, and circuit analogies were presented to the loop-gap geometry and to the Overhauser phenomenon. An elongated, cylindrical marker was realized by constructing a transmission-line marker where a microwave shield and tapered coupling were included in the design. The markers' feasibility in interventional use was demonstrated in phantom and in vitro experiments, and the loop-gap marker was used in high-resolution MR studies. en
dc.format.extent 47, [31]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Helsinki University of Technology, Applied Electronics Laboratory. Series B, Research reports en
dc.relation.ispartofseries 7 en
dc.relation.haspart R. P. Joensuu, R. E. Sepponen, A. E. Lamminen, C.-G. M. Standertskjöld-Nordenstam, Interventional MR imaging: Demonstration of the feasibility of the Overhauser marker enhancement (OMEN) technique. Acta Radiologica 38: 43-46, 1997.
dc.relation.haspart R. P. Joensuu, R. E. Sepponen, A. E. Lamminen, S. E. Savolainen, C.-G. M. Standertskjöld-Nordenstam, High-Accuracy MR tracking of interventional devices: The Overhauser Marker Enhancement (OMEN) technique. Magnetic Resonance in Medicine 40: 914-921, 1998.
dc.relation.haspart R. P. Joensuu, R. E. Sepponen, A. E. Lamminen, C.-G. M. Standertskjöld-Nordenstam, A shielded Overhauser marker for MR tracking of interventional devices. Magnetic Resonance in Medicine 43: 139-145, 2000.
dc.relation.haspart R. P. Joensuu, R. E. Sepponen, T. E. Autti, J. I. Tanttu, A. E. Lamminen, C.-G. M. Standertskjöld-Nordenstam, A sub-voxel sized Overhauser phantom for high-resolution studies in MRI. Report B6, Applied Electronics Laboratory, Helsinki University of Technology, 2000.
dc.subject.other Electrical engineering en
dc.title Design and evaluation of Overhauser enhanced MRI visible markers en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Electrical and Communications Engineering en
dc.contributor.department Sähkö- ja tietoliikennetekniikan osasto fi
dc.subject.keyword interventional MRI en
dc.subject.keyword device visualization en
dc.subject.keyword Overhauser effect en
dc.identifier.urn urn:nbn:fi:tkk-002410
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Applied Electronics Laboratory en
dc.contributor.lab Sovelletun elektroniikan laboratorio fi


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