Measurements regarding a combined therapy concept for ophthalmic tumors consisting of brachytherapy and x-rays

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dc.contributor.authorManke, Henning
dc.contributor.authorFluehs, D
dc.contributor.authorStroth, Michelle
dc.contributor.authorBechrakis, N E
dc.contributor.authorFoerster, A M H
dc.contributor.authorAlbrecht, Johannes
dc.date.accessioned2025-09-25T05:50:36Z
dc.date.available2025-09-25T05:50:36Z
dc.date.issued2024-06-26
dc.description.abstractObjective. We present a novel concept to treat ophthalmic tumors which combines brachytherapy and low-energy x-ray therapy. Brachytherapy with 106Ru applicators is inadequate for intraocular tumors with a height of 7 mm or more. This results from a steep dose gradient, and it is unfeasible to deliver the required dose at the tumor apex without exceeding the maximum tolerable sclera dose of usually 1000 Gy to 1500 Gy. Other modalities, such as irradiation with charged particles, may be individually contraindicated. A dose boost at the apex provided by a superficial x-ray therapy unit, performed simultaneously with the brachytherapy, results in a more homogeneous dose profile than brachytherapy alone. This avoids damage to organs at risk. The applicator may also serve as a beam stop for x-rays passing through the target volume, which reduces healthy tissue dosage. This study aims to investigate the suitability of the applicator to serve as a beam stop for the x-rays. Approach. A phantom with three detector types comprising a soft x-ray ionization chamber, radiochromic films, and a self-made scintillation detector was constructed to perform dosimetry. Measurements were performed using a conventional x-ray unit for superficial therapy to investigate the uncertainties of the phantom and the ability of the applicator to absorb x-rays. The manufacturer provided a dummy plaque to obtain x-ray dose profiles without noise from 106Ru decays. Results. The phantom is generally feasible to obtain dose profiles with three different detector types. The interaction of x-rays with the silver of the applicator leads to an increased dose rate in front of the applicator. The dose rate of the x-rays is reduced by up to 90% behind a 106Ru applicator. Therefore, a 106Ru applicator can be used as a beam stop in combined x-ray and brachytherapy treatment.en
dc.identifier.urihttp://hdl.handle.net/2003/43995
dc.language.isoen
dc.relation.ispartofseriesBiomedical physics & engineering express; 10(4)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectBrachytherapyen
dc.subjectRuthenium-106en
dc.subjectX-raysen
dc.subjectOphthalmic tumorsen
dc.subjectChoroidal and uveal melanomaen
dc.subject.ddc530
dc.titleMeasurements regarding a combined therapy concept for ophthalmic tumors consisting of brachytherapy and x-raysen
dc.typeText
dc.type.publicationtypeArticle
dcterms.accessRightsopen access
eldorado.doi.registerfalse
eldorado.secondarypublicationtrue
eldorado.secondarypublication.primarycitationManke, H., Fluehs, D., Stroth, M., Bechrakis, N. E., Foerster, A. M. H., & Albrecht, J. (2024). Measurements regarding a combined therapy concept for ophthalmic tumors consisting of brachytherapy and x-rays. Biomedical physics & engineering express, 10(4), Article 045056. https://doi.org/10.1088/2057-1976/ad3bbb
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1088/2057-1976/ad3bbb

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