MOSFET dosimeters: the role of encapsulation on dosimetric characteristics in mixed gamma-neutron and megavoltage X-ray fields

Rosenfeld, Anatoly B.; Carolan, Martin; Kaplan, G.; Allen, Barry J.; Khivrich, V.I.

doi:10.1109/23.489229

Cited by 58 publications

(38 citation statements)

References 16 publications

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“…In build up region 0-4 mm response of MOSkin less then FOD and both of them under-responded when compared to the ionization chamber, which is related to the large size of FOD used and Farmer IC and error associated with this. Previous comparison of Monte Carlo simulations, ATTIX IC and bare MOSFET response demonstrated perfect agreement 5,10 in a build up region that is supporting assumption above. Table 1 shows the PDD values obtained when the MOSkin, fiber optic dosimeter, and Attix chamber were placed on the surface of the phantom and irradiated at field sizes of 5 5, 10 10, 20 20, and 40 40 cm 2 .…”

Section: Resultssupporting

confidence: 53%

“…They can provide accurate integrated dose readings, but their reading becomes less accurate when the mean energy spectrum of the beam is less than 250 keV. Below 200 keV, the MOSFET begins to over respond and demand calibration in the same field 6,10) This paper aims to investigate the performance of the new MOSkin™ dosimeter and a fiber optic dosimetry system when irradiated on a LINAC. The MOSkin™ was designed at the Centre for Medical Radiation Physics (CMRP), University of Wollongong, Australia, while the fiber optic dosimetry (FOD) system utilizes a BCF-20 scintillating crystal from Saint-Gobain Crystals (Bicron).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of the New MOSkin Detector and Fiber Optic Dosimetry System for Radiotherapy

Kwan

Lee

Yoo

et al. 2008

Journal of Nuclear Science and Technology

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In radiotherapy, interest in real-time dosimetry stems from the desire to monitor the dose delivered to the target volume and the surrounding normal tissue to enable clinicians to track the progress of the treatment, and prevent surrounding tissue from receiving too much radiation dose. In this study, the dosimetric performance of the new MOSkin dosimeter and a Bicron BCF-20 scintillating fiber was compared to depth dose measurements taken with a Farmer-type ionization chamber. The performance of the MOSkin and BCF-20 detectors in the build-up region of the depth dose curve, where the dose gradient is steep, is also compared to readings taken with an Attix chamber. At depths greater than 15 mm, the MOSkin readings deviated from the ion chamber readings by up to 4%, while the fiber optic dosimeter always remained within 3% of the ionization chamber reading. In the build-up region, the MOSkin proved quite capable of measuring the dose at build up when compared to the Attix chamber results, while the fiber optic dosimeter was not able to measure the dose in this region with a high level of precision due to the thick sensitive volume of the scintillating crystal.

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Section: Resultssupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Comparison of the New MOSkin Detector and Fiber Optic Dosimetry System for Radiotherapy

Kwan

Lee

Yoo

et al. 2008

Journal of Nuclear Science and Technology

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“…The energy response of the MOSFET detector for x-ray fields has been addressed previously. 26,27 In Fig. 7 no such discrepancies exist due to the fact that the valley dose is made up from scattered components from the primary beams and therefore the change in energy spectrum is less significant.…”

Section: Resultsmentioning

confidence: 99%

MOSFET dosimetry for microbeam radiation therapy at the European Synchrotron Radiation Facility

et al. 2003

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Preclinical experiments are carried out with ϳ20-30 m wide, ϳ10 mm high parallel microbeams of hard, broad-''white''-spectrum x rays ͑ϳ50-600 keV͒ to investigate microbeam radiation therapy ͑MRT͒ of brain tumors in infants for whom other kinds of radiotherapy are inadequate and/or unsafe. Novel physical microdosimetry ͑implemented with MOSFET chips in the ''edge-on'' mode͒ and Monte Carlo computer-simulated dosimetry are described here for selected points in the peak and valley regions of a microbeam-irradiated tissue-equivalent phantom. Such microbeam irradiation causes minimal damage to normal tissues, possible because of rapid repair of their microscopic lesions. Radiation damage from an array of parallel microbeams tends to correlate with the range of peak-valley dose ratios ͑PVDR͒. This paper summarizes comparisons of our dosimetric MOSFET measurements with Monte Carlo calculations. Peak doses at depths Ͻ22 mm are 18% less than Monte Carlo values, whereas those depths Ͼ22 mm and valley doses at all depths investigated ͑2 mm-62 mm͒ are within 2-13 % of the Monte Carlo values. These results lend credence to the use of MOSFET detector systems in edge-on mode for microplanar irradiation dosimetry.

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“…The macrodosimetric tissue equivalency of silicon or silicon dioxide for integral low Linear Energy Transfer ͑LET͒ photon irradiation is well established. 8 However, methods for converting silicon based microdosimetric measurements to tissue volumes are required.…”

Section: Introductionmentioning

confidence: 99%

Tissue equivalence correction for silicon microdosimetry detectors in boron neutron capture therapy

Bradley

Rosenfeld

1998

Medical Physics

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Reverse-biased silicon p-n junction arrays have been proposed as microdosimetry detectors. The tissue equivalence of such detectors in boron neutron capture therapy ͑BNCT͒ is discussed. A comparison of the range-energy relationships of H, He, C, and Li ions in tissue ͑ICRU-muscle͒ and silicon is given. A simple geometrical scaling ͑ϳ0.63͒ of linear dimensions is required to convert microdosimetric energy deposition measurements performed in silicon to equivalent deposition in tissue. The Monte Carlo technique is used to examine energy deposition for two simple geometrical cases applicable to BNCT.

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MOSFET dosimeters: the role of encapsulation on dosimetric characteristics in mixed gamma-neutron and megavoltage X-ray fields

Cited by 58 publications

References 16 publications

Comparison of the New MOSkin Detector and Fiber Optic Dosimetry System for Radiotherapy

Comparison of the New MOSkin Detector and Fiber Optic Dosimetry System for Radiotherapy

MOSFET dosimetry for microbeam radiation therapy at the European Synchrotron Radiation Facility

Tissue equivalence correction for silicon microdosimetry detectors in boron neutron capture therapy

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