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Rozprawy doktorskie na temat „MOSFET dosimetry”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Siebel, Osmar Franca. "Desenvolvimento de um dosímetro in vivo a MOSFET para aplicações em radioterapia." reponame:Repositório Institucional da UFSC, 2013. https://repositorio.ufsc.br/xmlui/handle/123456789/122778.

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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2013.<br>Made available in DSpace on 2014-08-06T17:21:47Z (GMT). No. of bitstreams: 1 325426.pdf: 6454074 bytes, checksum: 53e8bea408ce70608702b736942b96c2 (MD5) Previous issue date: 2013<br>Na radioterapia (teleterapia), a diferença entre a dose prescrita e a dose recebida pelo paciente deve ser de no máximo 5%. Por esta razão o uso de dosímetros é essencial para atingir esta especificação e garantir o sucesso deste tipo de tratamento contra o cânce

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Pereira, Lenon Mendes. "Caracterização do MOSFET MOskin para dosimetria em tomografia computadorizada." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/14936.

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Submitted by Isaac Francisco de Souza Dias (isaac.souzadias@ufpe.br) on 2016-01-19T18:10:45Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Lenon Mendes Dissertacao Mestrado 2015.pdf: 3797605 bytes, checksum: 7022202de7a4af31595ea4374ab76da7 (MD5)<br>Made available in DSpace on 2016-01-19T18:10:45Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Lenon Mendes Dissertacao Mestrado 2015.pdf: 3797605 bytes, checksum: 7022202de7a4af31595ea4374ab76da7 (MD5) Previous issue date: 2015-05-29<br

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Kotiaho, A. (Antti). "Radiation dose determination using MOSFET and RPL dosimeters in x-ray imaging." Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526222653.

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Abstract Medical x-ray imaging is used to visualise patients’ anatomical structures and in some cases their physiology. X-rays are ionizing radiation, thus their use needs to be optimised, as stochastic effects are assumed to increase linearly with the exposure dose. Imaging protocols need to be optimised to a radiation dose level that follows the as low as reasonably achievable principle without compromising the diagnostic value of the image. Different methods can be used to help in the optimisation process, such as simulations, radiation dose and image quality assessments with dosimeters and

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Amoush, Ahmad A. "Error Analysis of non-TLD HDR Brachytherapy Dosimetric Techniques." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307105202.

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Lemire, Matthieu. "Accurate surface dose measurements in CT examinations using high sensitivity MOSFET dosimeters calibrated by Monte Carlo simulations." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98747.

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The objective of this work is to use MOSFET dosimeters to accurately measure surface dose delivered during CT examinations in various scanning conditions. To achieve this, the behaviour of MOSFETs under kilovoltage x-ray irradiation first needed to be investigated. A dose-to-dose reproducibility of 4.5%, and a mean change in sensitivity response of 10.4% with accumulated dose were measured. A Monte Carlo model of the x-ray source of a PQ5000 CT simulator was built and validated in order to investigate the MOSFET response characteristics and perform dose calculations. An over-response of 10% wa

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Häger, Wille. "Characterization of fading effects of a MOSFET semiconductor dosimeter to be used on an X-ray laser." Thesis, Stockholms universitet, Medicinsk strålningsfysik (tills m KI), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147485.

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In the European XFEL, electrons bunches are accelerated up to 20 GeV and thenenter undulators where coherent X-rays are produced which can be used for imaging atva molecular level. Electrons may stray from the path and hit the permanent magnets inthe undulators. It is well known that ionizing radiation can affect the magnetic characteristics of permanent magnets. The undulators are therefore equipped with a type of semiconductor dosimeters, RADFETs, so that the potential damage from ionizing radiation to the magnets can be measured and corrected for. It is also known that heat will be generate

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Nelligan, Raelene Ann. "Investigation into the dosimetric characteristics of MOSFETs for use for in vivo dosimetry during external beam radiotherapy." Thesis, 2009. http://hdl.handle.net/2440/55292.

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This thesis investigates the response to ionising radiation, of p-type Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) (REM Oxford (UK)) and a reader system developed by the Centre for Medical Radiation Physics, The University of Wollongong, to determine their feasibility for measurements of dose during radiotherapy treatment (in vivo dosimetry (IVD)). Two types of MOSFET probes were used -"single sensitivity", for measuring low doses, and "dual sensitivity", to measure both high and lose doses. Sensitivity, linearity of response with dose, and response changes with accumulated do

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Nelligan, Raelene Ann. "Investigation into the dosimetric characteristics of MOSFETs for use for in vivo dosimetry during external beam radiotherapy." 2009. http://hdl.handle.net/2440/55292.

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This thesis investigates the response to ionising radiation, of p-type Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) (REM Oxford (UK)) and a reader system developed by the Centre for Medical Radiation Physics, The University of Wollongong, to determine their feasibility for measurements of dose during radiotherapy treatment (in vivo dosimetry (IVD)). Two types of MOSFET probes were used -"single sensitivity", for measuring low doses, and "dual sensitivity", to measure both high and lose doses. Sensitivity, linearity of response with dose, and response changes with accumulated do

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Wang, Chu. "Radiation Dose Estimation for Pediatric Patients Undergoing Cardiac Catheterization." Diss., 2015. http://hdl.handle.net/10161/11350.

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<p>Patients undergoing cardiac catheterization are potentially at risk of radiation-induced health effects from the interventional fluoroscopic X-ray imaging used throughout the clinical procedure. The amount of radiation exposure is highly dependent on the complexity of the procedure and the level of optimization in imaging parameters applied by the clinician. For cardiac catheterization, patient radiation dosimetry, for key organs as well as whole-body effective, is challenging due to the lack of fixed imaging protocols, unlike other common X-ray based imaging modalities. </p><p>Pediatric pa

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10

Wu, Tie-Liang, and 吳泰良. "THE STUDY OF MOSFET GAMMA-RAY DOSIMETER." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/00508645211146417841.

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Παπαθανάσης, Χαράλαμπος. "Measurements of periferal dose in five clinical radiotherapy cases with Mosfet detectors in anthropomorphic phantom." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/2545.

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In the current study, we present measurements of peripheral dose that is absorbed by specific radio-sensitive organs outside the radiation field for five clinical cases, and compare them with the corresponding values that are given by ISIS 3D Treatment Planning System, as well as with the values given by a software that can calculate peripheral doses called ‘Peridose’. The measurements were made with MOSFET dosimeters in anthropomorphic phantom.<br>Στην παρούσα εργασία, παρουσιάζουμε μετρήσεις της περιφερειακής δόσης που απορροφάται από συγκεκριμένα ακτινευαίσθητα όργανα εκτός του πεδίου ακτιν

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12

Ribeiro, Tiago Nuno Ramos. "Estudo e implementação de dosimetria com Mosfet em braquiterapia de alta taxa de dose." Master's thesis, 2010. http://hdl.handle.net/10451/5382.

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Tese de mestrado, Engenharia Física, Universidade de Lisboa, Faculdade de Ciências, 2010<br>A dosimetria in vivo em braquiterapia, quando devidamente implementada, produz importantes beneficios, tais como a possibilidade de correccoes de fraccoes de dose, alertar para doses eventualmente excessivas em orgaos de risco, a avaliacao dose-efeito mais precisa, a deteccao de falhas e a comparacao de doses reais com doses planeadas. Estudos recentes mostram o uso de pequenos MOSFET em dosimetria in vivo de braquiterapia com incertezas totais de  8%. As dependencias com dose acumulada, energia e temp

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Morton, Jason. "Clinical implementation of MOSFETs for entrance dose in-vitro dosimetry with high energy photons for external beam radiation therapy." Thesis, 2006. http://hdl.handle.net/2440/37882.

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In external beam radiotherapy quality assurance is carried out on the individual components of the treatment chain. The patient simulating device, planning system and linear accelerators are tested regularly according to set protocols developed by national and international organizations. Even though these individual systems are tested errors can be made in the transfer between systems. The best quality assurance for the system is at the end of the treatment planning chain. In-vivo dosimetry measures the dose to the target volume through indirect measures at the end of the treatment plann

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Morton, Jason. "Clinical implementation of MOSFETs for entrance dose in-vitro dosimetry with high energy photons for external beam radiation therapy." 2006. http://hdl.handle.net/2440/37882.

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In external beam radiotherapy quality assurance is carried out on the individual components of the treatment chain. The patient simulating device, planning system and linear accelerators are tested regularly according to set protocols developed by national and international organizations. Even though these individual systems are tested errors can be made in the transfer between systems. The best quality assurance for the system is at the end of the treatment planning chain. In-vivo dosimetry measures the dose to the target volume through indirect measures at the end of the treatment planning c

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15

Βλαχοπούλου, Βασιλική. "Study of peripheral dose in stereotactic radiotherapy with cyberknife with the use of the mobileMOSFET dose verification system." Thesis, 2011. http://hdl.handle.net/10889/5166.

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The risk of secondary cancer associated with low doses of ionizing radiation, is gaining new interest every day, especially in long term surviving patients. The unavoidable amount of the scattered dose, which is absorbed by radiosensitive tissues/organs away from the irradiated treatment site, known as peripheral dose (PD), is the outcome of secondary irradiation sources while it influences the treatment parameters. Since the associated cancer risk is likely to be much lower but not insignificant from such low doses this may affect the choice of treatment options adopted. In this study, we per

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