Search results for "Nuclear magnetic resonance relaxometry"

showing 2 items of 2 documents

Correlation between ferrous ammonium sulfate concentration, sensitivity and stability of Fricke gel dosimeters exposed to clinical X-ray beams

2014

Abstract This work describes the characterization of various Fricke-Agarose-Xylenol gels (FXG) dosimeters using NMR relaxometry and MRI analysis. Using X-rays from a clinical linear accelerator (LINAC), the gels were irradiated in the dose range from 0 Gy to 20 Gy. The photon sensitivity of the FXGs was measured in terms of NMR relaxation rates; its dependence on radiation dose was determined as a function of ferrous ammonium sulfate contents (from 0.5 mM to 5 mM). Furthermore, the stability of the NMR signal was monitored over several days after irradiation. These measurements were aided by Magnetic Resonance Imaging (MRI) scans which allowed three-dimensional (3D) dose mapping. In order t…

Nuclear and High Energy PhysicsRelaxometryPhotonDosimetermedicine.diagnostic_testChemistrySettore ING-IND/20 - Misure E Strumentazione NucleariDetectorSettore FIS/01 - Fisica SperimentaleMagnetic resonance imagingSignalLinear particle acceleratorSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Nuclear magnetic resonancemedicineIrradiationSettore MED/36 - Diagnostica Per Immagini E RadioterapiaInstrumentationGel dosimeter Agarose Nuclear Magnetic Resonance relaxometryMagnetic Resonance Imaging clinical photons beam
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NMR relaxometry measurements of Fricke gel dosimeters exposed to neutrons

2014

Fricke infused gel matrices offer several features making them suitable for dosimetric applications; among the set here are tissue equivalence, low cost and ease of preparation. Their nuclear magnetic resonance (NMR) relaxation properties can be used as a radiation detector for the dosimetry of beams used in cancer therapy. In recent years neutron capture therapy has been resumed for the treatment of various types of cancer and it requires three-dimensional mapping of the neutron fields. In this work, we investigated this particular application through NMR relaxometry and MR imaging of Fricke gels exposed to neutrons. We analyzed both the R1 and R2 relaxation rates, which relate to the long…

Nuclear magnetic resonance relaxometryRelaxometryRadiationDosimeterChemistryPhysics::Medical PhysicsRelaxation (NMR)FluenceSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)Neutron captureGel dosimeterNuclear magnetic resonanceMagnetic resonance imagingNeutron fluxDosimetryFricke methodNeutronNeutron beam
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