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Relevant bibliographies by topics / Small field dosimetry / Dissertations / Theses

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Dissertations / Theses on the topic 'Small field dosimetry'

Author: Grafiati

Published: 4 June 2021

Last updated: 29 January 2023

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1

Charles, Paul Henry. "Very small field dosimetry." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/78916/4/Paul_Charles_Thesis.pdf.

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This thesis investigated in detail the physics of small X-ray fields used in radiotherapy treatments. Because of this work, the ability to accurately measure dose from these very small X-ray fields has been improved in several ways. These include scientifically quantifying when highly accurate measurements are required by introducing the concept of a very small field, and by the invention of a new detector that responds the same in very small fields as in normal fields.

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2

Cranmer-Sargison, Gavin. "Small field dosimetry : experimental methods and Monte Carlo simulation in small field radiation therapy dosimetry." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/7762/.

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The goal of the thesis was to investigate, and better define, what the requirements are for accurate small field relative dosimetry. Diode detector selection and experimental techniques were evaluated. EGSnrc Monte Carlo simulations were used to predict diode detector dosimetric parameters and assist in interpreting measured data. An emerging scintillator based detector technology was also tested and methods developed to standardize the reporting of small field dosimetric data. Using careful experimental methods the relative output uncertainty for the smallest square field size of side 0.5 cm

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3

Wong, Christopher James, and chrisjwong@yahoo com au. "High Resolution Polymer Gel Dosimetry for Small and Micro Field Dosimetry, and Development of Innovative Polymer Gel Dosimeters." RMIT University. Medical Sciences, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20091002.161512.

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Current radiotherapy techniques are focused on delivering effective treatments while sparing surrounding healthy tissues. As a result, radiotherapy treatments are using narrower and more tightly conforming therapy techniques. For these treatments to be effective an accurate measure of the dose delivered by these very narrow radiotherapy beams, both in and around the target volume, is required. It is a challenging task for the conventional type dosimeters to determine dose distribution in such small fields. The best example of such fields is microbeam beam radiotherapy (MRT), a developing treat

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4

Qureshi, Aleem. "A Novel Equivalent Squares Formalism for use in Small Field Dosimetry." University of Toledo Health Science Campus / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=mco149338511600157.

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5

Underwood, Ryan John. "Small field dose measurements with Gafchromic film." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47675.

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Purpose: To examine the dosimetric characteristics of Gafchromic EBT3 film when measuring small fields of radiation, and compare it against other common radiation detectors. Methods and Materials: EBT3 film was placed in a solid water phantom and irradiated with 6MV photons, field sizes from 10x10cm2 down to 6x6mm2. The films were scanned with a Vidar DosimetryPRO Advantage Red scanner, and analyzed with RIT113 software. The films were also scanned at different orientations and times to quantify the discrepancies associated with scanning orientation and post-exposure darkening. The same fields

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6

Polston, Gregory K. "A dosimetric model for small-field electron radiation therapy." Muncie, Ind. : Ball State University, 2008. http://cardinalscholar.bsu.edu/366.

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7

Martínez, Rovira Immaculada. "Monte Carlo and experimental small-field dosimetry applied to spatially fractionated synchrotron radiotherapy techniques." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/81470.

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Two innovative radiotherapy (RT) approaches are under development at the ID17 Biomedical Beamline of the European Synchrotron Radiation Facility (ESRF): microbeam radiation therapy (MRT) and minibeam radiation therapy (MBRT). The two main distinct characteristics with respect to conventional RT are the use of submillimetric field sizes and spatial fractionation of the dose. This PhD work deals with different features related to small-field dosimetry involved in these techniques. Monte Carlo (MC) calculations and several experimental methods are used with this aim in mind. The core of thi

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8

Puxeu, Vaqué Josep. "Contributions to new challenges in radiotherapy : from small field dosimetry to stereotactic body radiation therapy." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/663216.

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The use of small Fields has substantially increased in radiotherapy during recent years mainly due to expansion in the use of modulated techniques which are also used at some institutions for Stereotactic Body Radiotherapy (SBRT). The use of modulated techniques in lung SBRT is controversial due to the interplay effect. At the same time, small-volume dosemeters have appeared on the market in an attempt to try to cover new dosimetry necessities. This PhD deals with different features related to small-field dosimetry. It first analyzes the influence of differences between ionization chambers of

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9

Scott, Alison Jane Dalgleish. "Monte Carlo modelling of small field dosimetry : non-ideal detectors, electronic disequilibrium and source occlusion." Thesis, University of Liverpool, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.533947.

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10

Morales, Johnny Estuardo. "Advances in very small x-ray field dosimetry for circular cones used in stereotactic radiosurgery." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/133137/1/Johnny_Morales_Thesis.pdf.

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This project presents recent advances in small field dosimetry for radiosurgery treatments with Brainlab circular cones using 6 MV x-rays. The specific advances included: the use of a new microDiamond detector, the use of radiochromic film and OSLD detectors with an extrapolation technique, skin dose measurements and Monte Carlo simulation of radiosurgery treatments. There is limited published data on the output factor for the 4 mm circular cone. This thesis provides methodology and guidelines on how to perform such difficult measurements.

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11

Courter, Erik Joseph-Leonard. "Use of ClearView Gel Dosimeter for Quality Assurance and Testing of Stereotactic Radiosurgery." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1466417256.

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12

Omar, Artur. "Silicon Diode Dose Response Correction in Small Photon Fields." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-42649.

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<p>Silicon diodes compared to other types of dosimeters have several attractive properties, such as an excellent spatial resolution, a high sensitivity, and clinically practical to use. These properties make silicon diodes a preferred dosimeter for relative dosimetry for several types of measurements in small field dosimetry, e.g., stereotactic treatments and intensity modulated radiotherapy (IMRT). Silicon diodes are, however, limited by an energy dependent response variation in photon beams, resulting in that the diode readout per dose to the phantom medium varies with photon spectral change

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13

Wong, Tony Po Yin, and tony wong@swedish org. "Improving Treatment Dose Accuracy in Radiation Therapy." RMIT University. Applied Sciences, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080104.144139.

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The thesis aims to improve treatment dose accuracy in brachytherapy using a high dose rate (HDR) Ir-192 stepping source and in external beam therapy using intensity modulated radiation therapy (IMRT). For HDR brachytherapy, this has been achieved by investigating dose errors in the near field and the transit dose of the HDR brachytherapy stepping source. For IMRT, this study investigates the volume effect of detectors in the dosimetry of small fields, and the clinical implementation and dosimetric verification of a 6MV photon beam for IMRT. For the study of dose errors in the near field o

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14

Baluti, Florentina. "Monte Carlo Simulations of Chemical Vapour Deposition Diamond Detectors." Thesis, University of Canterbury. Physics and Astronomy, 2009. http://hdl.handle.net/10092/3190.

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Chemical Vapour Deposition (CVD) diamond detectors were modelled for dosimetry of radiotherapy beams. This was achieved by employing the EGSnrc Monte Carlo (MC) method to investigate certain properties of the detector, such as size, shape and electrode materials. Simulations were carried out for a broad 6 MV photon beam, and water phantoms with both uniform and non-uniform voxel dimensions. A number of critical MC parameters were investigated for the development of a model that can simulate very small voxels. For a given number of histories (100 million), combinations of the following paramete

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15

Paskalev, Kamen A. "Dosimetry of very small photon fields." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29463.

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Several dosimetric parameters were measured for three very small radiation fields (1.5, 3, and 5 mm diameter at the machine isocenter) with a small ionization chamber and a new type of radiochromic film. The experiments were carried out on a Clinac-18 linac and the fields were shaped by specially manufactured collimators. When measuring dose profiles, the ionization chamber measurements were first corrected for response variation in off-axis direction, and then deconvolved to eliminate the blur due to the poor resolution of the chamber. The measured data agreed with Monte Carlo simulations wit

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16

Piliero, Maria Antonietta. "Modelling and development of tissue-equivalent dosimeters for small field radiotherapy." Thesis, Swansea University, 2013. https://cronfa.swan.ac.uk/Record/cronfa42465.

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A radiotherapy treatment is a clinical treatment which makes use of ionizing radiation to treat cancerous diseases. However, the ionizing radiation interacting within the cells can lead to DNA damage in both the cancerous and normal tissues. Therefore the exact knowledge of the dose delivered to the patient is essential because it greatly affects the effectiveness of the treatment. Dosimetry is usually performed by air ionization chambers however their use in the dosimetry of small photon beams is limited by their large sensitive volume. The ideal detector has a small, water-equivalent sensiti

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17

Sabino, Talita. "Estudo e validação da dosimetria em condições de não-referência." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-25082011-105058/.

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Com o avanço tecnológico dos equipamentos utilizados em radioterapia tornaram-se possíveis o uso de alguns campos de radiação nomeados como campos pequenos em algumas modalidades especiais de radioterapia. Com isso, a dosimetria dos feixes de radiação também teve de ser revista, pois com estes novos tamanhos de campos, não há condição de referência como aquela dita nos protocolos e diretrizes de dosimetria. Neste trabalho foi realizado um estudo completo sobre os campos pequenos, bem como sua dosimetria, mostrando o comportamento dos detectores nessa nova condição de dosimetria através de uma

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SABINO, TALITA. "Estudo e validação da dosimetria em condições de não-referência." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10012.

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Made available in DSpace on 2014-10-09T12:33:48Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:04:02Z (GMT). No. of bitstreams: 0<br>Dissertação (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP

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19

Underwood, Tracy Sarah Amy. "The dosimetry of small, megavoltage photon fields : correction factors, dose area products and detector designs." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:0266f2b0-93fe-4588-ab42-d7db0f59a3cb.

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In recent years, small fields have come to play a key role in advanced radiotherapy, yet protocols to perform dosimetry under small field conditions are still in their infancy. In 2008, the IAEA and AAPM published a formalism [Med. Phys. 35, 5179-5186] recommending the use of point-dose correction factors. This thesis uses Monte Carlo simulations to demonstrate that the values of these correction factors depend strongly on both detector design and field size, as well as other variables such as detector off-axis position and detector azimuthal angle. Mass density is found to be the principal de

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20

Costa, Nathalia Almeida. "Desenvolvimento e implementação de um objeto simulador para dosimetria de equipamentos Gamma Knife&reg." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-03072018-095701/.

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A radiocirurgia estereotáxica é um procedimento que trata principalmente lesões intracranianas para destruir células tumorais inacessíveis cirurgicamente. O Gamma Knife® é uma unidade de radiocirurgia estereotáxica que trata lesões exclusivamente cerebrais com feixes de 60Co de forma não-invasiva. De forma a garantir a acurácia na entrega da dose, esse tipo de equipamento necessita de detectores adequados para determinar a dose a ser entregue com exatidão. O protocolo da IAEA, TRS 483, é um guia padronizado para procedimentos dosimétricos e indicação de detectores relativos à dosimetria de

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21

Stradiotto, Marco. "A Monte Carlo study to investigate the dosimetric accuracy in the small field regime." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/32683.

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Stereotactic radiosurgery (SRS) is a technique where an external photon beam is used to deliver a high dose of ionizing radiation to a small, localized brain lesion. The treatment fields used in this technique can be of the order of 1 cm for a circular collimated field. Accurate dosimetry of small-field photon beams such as those used in stereotactic radiosurgery is difficult because of the presence of steep dose gradients and lateral electronic disequilibrium (LED). Conventional measurement devices and treatment planning systems (TPS) have difficulty in determining dose accurately for

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22

Benmakhlouf, Hamza. "Key Data for the Reference and Relative Dosimetry of Radiotherapy and Diagnostic and Interventional Radiology Beams." Doctoral thesis, Stockholms universitet, Fysikum, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-114413.

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Accurate dosimetry is a fundamental requirement for the safe and efficient use of radiation in medical applications. International Codes of Practice, such as IAEA TRS-398 (2000) for radiotherapy beams and IAEA TRS-457 (2007) for diagnostic radiology beams, provide the necessary formulation for reference and relative dosimetry and the data required for their implementation. Research in recent years has highlighted the shortage of such data for radiotherapy small photon beams and for surface dose estimations in diagnostic and interventional radiology, leading to significant dosimetric errors tha

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23

Nobecu, Lazola Jethro. "Cobalt teletherapy small field dosimetry." Thesis, 2017. http://hdl.handle.net/10539/23465.

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A research report submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in partial fulfilment of the requirements for the degree of Master of Science in the field of Medical Physics. 2017<br>Aim The aim of this research was to contribute to clinical implementation of the small field dosimetry Code of Practice (CoP) that is due to be published by the International Atomic Energy Agency (IAEA) in collaboration with the American Association of Physicists in Medicine (AAPM) (1). A 6 cm × 6 cm virtual machine-specific reference (fmsr) field was established in a clinic

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24

M'ule, Barbara Chanda. "Small field dosimetry of high-energy electron beams." Thesis, 2009. http://hdl.handle.net/10539/6817.

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ABSTRACT Purpose: A comparative dosimetric study was conducted with four detectors manufactured by PTW-Freiburg (Germany) (Markus – type 23343, Advanced Markus – type 34045, PinPoint – type 31006 and a diode type – 60012) for small field high-energy electron beams. The dosimetry of Intraoperative Radiation Therapy (IORT) is challenging because of the type of tertiary collimation used. The cones increase low energy electron contamination and detectors with low energy dependence and high spatial resolution should be used. Materials and Methods: Dosimetric measurements were made using all

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25

Ko, Hui-Ling, and 柯慧玲. "Dosimetry of Small and Elongated Field Electron Beams for Preventing Arteriovenous Fistula Stenosis." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/23504633157415471977.

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碩士<br>國立陽明大學<br>放射醫學科學研究所<br>90<br>In recent years, more and more end-stage renal disease patients are noted. In 2000, over 300,000 people were being treated for end-stage renal disease in the United States. Hemodialysis is used in over 80% of all patients who undergo dialysis. When suitable anatomy exists, primary arteriovenous fistula remains the procedure of choice for hemodialysis access. Unfortunately, almost 50% of patients who have an arteriovenous grafts placed experience graft failure within 1 to 2 years. Distal (venous) anastomotic neointimal hyperplasia is the usual mechanism of gra

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26

Johnstone, Christopher Daniel. "Microcomputed tomography dosimetry and image quality in preclinical image-guided radiation therapy." Thesis, 2019. http://hdl.handle.net/1828/10789.

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Motivated by the need to standardize preclinical imaging for image-guided radiation therapy (IGRT), we examine the parameters that influence microcomputed tomography (microCT) scans in the realm of image quality and absorbed dose to tissue, including therapy beam measurements of small fields. Preclinical radiation research aims to understand radiation-induced effects in living tissues to improve quality of life. Small targets and low kilovoltage x-rays create challenges that do not arise in clinical radiation therapy. Evidence based on our multi-institutional study reveals a considerable

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27

Alhakeem, Eyad Ali. "Dosimetry at extreme non-charged particle equilibrium conditions using Monte Carlo and specialized dosimeters." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/10123.

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Radiotherapy is used in clinics to treat cancer with highly energetic ionizing particles. The radiation dose can be measured indirectly by means of radiation detectors or dosimeters. The dose deposited in a detector can be related to dose deposited in a point within the patient. In theory, however, this is only possible under charged particle equilibrium (CPE). The motivation behind the dissertation was driven by the difficult, yet crucial, dosimetry in non-CPE regions. Inaccurate dose assessment performed with standard dosimetry using ionization chambers may significantly impact the outcomes

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28

Chu, Che-Hsing, and 朱哲興. "Dosimetry for small photon fields using normoxic polymer gel dosimeter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/04963426953854692441.

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29

Msimang, Zakithi Lungile Mpumelelo. "Accuracy and associated measurement uncertainties in clinical dosimetry data for static small fields." Thesis, 2020. https://hdl.handle.net/10539/31402.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy, 2020<br>Developments in radiotherapy techniques and technologies have contributed to an increase in the use of small fields. Small fields are used in stereotactic treatments and large uniform or non-uniform fields that are composed of small fields such as for intensity modulated radiation therapy (IMRT). Implementation has predated guidance documents for clinical dosimetry. The first international Code of

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30

Haider, Jacob Abraham. "Dosimetry studies of small fields in homogeneous and inhomogeneous media for high energy photons." Thesis, 1995. http://hdl.handle.net/2429/7370.

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Dose decreases rapidly for photon field sizes smaller than the range of the laterally scattered electrons. The reduction in dose leads to dose non-uniformity and the degree of dose non-uniformity depends on the shape of the tumor. The dose reduction due to lateral electronic nonequilibrium increases with increasing photon energy. Small tumors are best treated with lower energy photons. We modified the primary and scatter dose model to include the effect of lateral electronic nonequilibrium. The dose model was verified experimentally for various geometries and is in good agreement with t

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31

Hsin-fa, Liao, and 廖信發. "The study of the miniature plastic scintillating fiber detector ─ A dosimeter for small field radiotherapy application." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/67004676340468207861.

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碩士<br>國立清華大學<br>原子科學系<br>90<br>The purpose of this study is trying to develop a miniature plastic scintillation fiber detecting system used for radiation measurement. The fluorescence light released promptly from the scintillator under the ionizing radiation exposed, therefore, the dose rate can be evaluated by its intensity of the light emitted. The work of the developed detecting system consists mainly (1) to develop a high impendence of high amplification current amplifier, which could convert the very low current signal into readable voltage output, and (2) to constru

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32

Αναστάσης, Βασιλάκης. "Δοσιμετρία μικρών πεδίων". Thesis, 2013. http://hdl.handle.net/10889/7787.

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Στόχος τη ακτινοθεραπείας είναι η χορήγηση της θεραπευτικής δόσης με τη μέγιστη δυνατή ακρίβεια. Αυτό συνεπάγεται τον σωστό καθορισμό της ακτινοβολούμενης περιοχής καθώς και την ακριβή εναπόθεση της δόσης. Αυτή η διπλωματική εργασία ασχολείται με την προσπάθεια για ακριβή υπολογισμό και εναπόθεση της δόσης για πεδία ακτινοβόλησης τα όποια είναι μικρότερα από 5x5cm. Όταν το μέγεθος του πεδίου μικρύνει τότε η μέτρηση και ο υπολογισμός της δόσης με κλασικές μεθόδους δε είναι πλέον ακριβείς καθώς παράγοντες όπως η πλευρική ηλεκτρονική ισορροπία, το μέγεθος και είδος του ανιχνευτή καθ

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Δροσάτου, Καλλιόπη. "Διασφάλιση ποιότητας στη στερεοτακτική ακτινοθεραπεία και δοσιμετρία μικρών πεδίων". Thesis, 2014. http://hdl.handle.net/10889/8361.

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Η στερεοτακτική μέθοδος ακτινοθεραπείας και ακτινοχειρουργικής είναι μια νεότερη μέθοδος της ογκολογίας, που αποδεδειγμένα υπερέχει έναντι της συμβατικής μεθόδου ακτινοβόλησης, ιδιαίτερα όταν συνδυάζεται με τελευταίες τεχνικές ακτινοβόλησης, όπως το IMRT, ArcTherapy and VMAT. Χαρακτηρίζεται δε από ακτινοβόληση με ιδιαίτερα υψηλές δόσεις, συνήθως πολύ μικρών όγκων, της τάξεως του εκατοστού. Εξαιτίας αυτών, είναι επιτακτική η ανάγκη για μέγιστη ακρίβεια και αποφυγή λαθών, καθώς δεν υπάρχουν περιθώρια σφάλματος! Κάθε ακτινοθεραπευτικό κέντρο οφείλει λοιπόν να ακολουθεί ένα ολοκληρωμένο και ιδια

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