36 Dosimetry with MOSFETs in Endovascular Brachytherapy with beta sources

Todorovic, M.; Thurmann, H.; Schönborn, T.; Schmidt, Rainer

doi:10.1016/s0167-8140(05)81014-x

Cited by 2 publications

(3 citation statements)

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“…Besides the change of the dose rate with increasing SSD, effects such as an increase of scattering and a change in the energy spectrum of the electrons can occur. We proved that the microMOSFET shows less than ±5% energy dependence in the energy range from 1 to 15 MeV as stated by the manufacturer (Drud et al 2005). The energy dependence of the Roos chamber is only influenced by the stopping power correction (according to the manufacturer's data sheet).…”

Section: Dose Rate Dependence In a 12 Mev Electron Beamsupporting

confidence: 55%

Beta dosimetry with microMOSFETs for endovascular brachytherapy

Todorovic¹,

Schönborn²,

Schmidt

2006

Phys. Med. Biol.

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The aim of this study was to investigate if microMOSFETs are suitable for the dosimetry and quality assurance of beta sources. The microMOSFET dosimeters have been tested for their angular dependence in a 6 MeV electron beam. The dose rate dependence was measured with an iridium-192 afterloading source. By varying the source-to-surface distance (SSD) in a 12 MeV electron beam the dose rate dependence in an electron beam was also investigated. To measure a depth dose curve the dose rate at 2, 5, 8 and 12 mm distance from the beta source train axis was determined with the OPTIDOS and the microMOSFET detector. A comparison between the two detector types shows that the microMOSFET is suitable for quality assurance of beta sources for endovascular brachytherapy (EVBT). The homogeneity of the source is checked by measurements at five points (for the 60 mm source at 10, 20, 30, 40 and 50 mm) along the source train. The microMOSFET was then used to evaluate the influence of a common stent type (single layer stainless steel) on the dose distribution in water. The stent led to a dose inhomogeneity of +/-8.5%. Additionally the percentage depth dose curves with and without a stent were compared. The depth dose curves show good agreement which means that the stent does not change the beta spectrum significantly.

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Section: Dose Rate Dependence In a 12 Mev Electron Beamsupporting

confidence: 55%

Beta dosimetry with microMOSFETs for endovascular brachytherapy

Todorovic¹,

Schönborn²,

Schmidt

2006

Phys. Med. Biol.

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“…While dose evaluations by computer simulation and by using dedicated phantoms are commonly employed in most cases, in vivo dose monitoring is not routinely performed in diagnostic techniques. Till now, Mosfets, thermoluminescent dosimeters (TLD), diodes, and in some cases, electronic portal imaging devices (EPID) are commonly employed in therapy techniques [2][3][4][5][6][7][8][9][10][11][12]. Many drawbacks are known for these devices, particularly for radiotherapy applications: Mosfets suffer of low reproducibility and low radiation hardness; radiation hardness of diodes also appears to be poor; TLD have a low reproducibility and dose assessment is strongly delayed in time.…”

Section: Introductionmentioning

confidence: 99%

“…Many drawbacks are known for these devices, particularly for radiotherapy applications: Mosfets suffer of low reproducibility and low radiation hardness; radiation hardness of diodes also appears to be poor; TLD have a low reproducibility and dose assessment is strongly delayed in time. Moreover, due to their macroscopic dimensions, such dosimeters generally do not allow the direct in vivo determination of the dose imparted to inner organs, although very recent studies seem to open the perspective of the use of Mosfets in brachytherapy and in intensity modulated radiotherapy (IMRT) of oropharynx and nasopharynx [8][9][10]. Finally, except for diodes, dosimeters nowadays do not allow a direct "real time" dose evaluation.…”

Section: Introductionmentioning

confidence: 99%

Ce-doped SiO 2 optical fibers for remote radiation sensing and measurement

Chiodini

Vedda

Fasoli

et al. 2009

Fiber Optic Sensors and Applications VI

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Scintillating materials, able to convert energy of ionizing radiation into light in the visible-UV interval, are presently used in a wide class of applications such as medical imaging, industrial inspection, security controls and high energy physics detectors.In the last few years we studied and developed a new radiation sensor based on silica-glass fiber-optic technology. In its simplest configuration such device is composed by a short portion (about 10 mm) of scintillating fiber coupled to a photomultiplier through a suitably long passive silica fiber. In this work, we present new results concerning the characterization of silica based Ce and Eu doped fibers glasses obtained by a modified sol-gel method and drawn by a conventional drawing tower for optical fibers. The radioluminescence of Eu doped fibers is rather weak; moreover it displays a marked sensitivity increase during subsequent irradiations, preventing the use of such fibers in dosimetry. On the other hand Ce-doped fibers show very high radiation hardness, signal stability and reproducibility, and high sensitivity to radiations with energies from 10 keV to several tens of MeV. Numerous tests with photons (X and gamma rays), electrons, and protons have already been successfully performed. At the early stage of its market introduction it is the smallest radiation sensor, also compared to MOSFET and diode technology and it appears to be the ideal choice for in vivo measurements in medical field or remote sensing.

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36 Dosimetry with MOSFETs in Endovascular Brachytherapy with beta sources

Cited by 2 publications

References 0 publications

Beta dosimetry with microMOSFETs for endovascular brachytherapy

Beta dosimetry with microMOSFETs for endovascular brachytherapy

Ce-doped SiO 2 optical fibers for remote radiation sensing and measurement

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