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Magnetic Resonance Compatibility of a Transponder Aimed for Radiotherapy Positioning – A Phantom Study
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Radiology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medical Radiation Science.
Örebro University Hospital, Department of Oncology.
Örebro University Hospital, Department of Oncology.
2017 (English)In: Anticancer Research, ISSN 0250-7005, E-ISSN 1791-7530, Vol. 37, no 9, p. 4993-4996Article in journal (Refereed) Published
Abstract [en]

Background/Aim: Electromagnetic Positioning Systems (EMP) is a new position-ing technique in four-dimensional radiotherapy. Patients with implanted transponders may be referred for magnetic resonance imaging (MRI) making it important to establish the MR safety.

Materials and Methods: Oranges were prepared with transponders and imaged on a 3T MR scanner with different sequences. Computed tomography (CT) was performed as comparison. MR artifacts were assessed. An estimation of the maximum transponder de-flection force and heating was made.

Results: The mean measured displacement of transponders was 0.1 mm (range=0.03-0.3 mm). Artifacts were observed adjacent to transponders using all sequences. The deflection force on the transponder in the gantry was less than 38 mN. No heating was observed.

Conclusion: The absence of any substantial movement, the weak measured deflection force and absence of observed heating speaks for the safe use of MR imaging with transponder 3T. Local artefacts makes evaluation impossible adjacent to transponders.

Place, publisher, year, edition, pages
2017. Vol. 37, no 9, p. 4993-4996
Keyword [en]
Prostate cancer, electromagnetic positioning, four dimensional radiotherapy
National Category
Medical and Health Sciences Cancer and Oncology
Identifiers
URN: urn:nbn:se:uu:diva-333690DOI: 10.21873/anticanres.11911ISI: 000412578200034PubMedID: 28870923OAI: oai:DiVA.org:uu-333690DiVA: diva2:1157459
Available from: 2017-11-16 Created: 2017-11-16 Last updated: 2018-01-12Bibliographically approved

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Wikström, JohanIsacsson, Ulf

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