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Dissertations / Theses on the topic 'Multileaf collimator'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 April 2022

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1

Greer, Peter Brian. "A dual assembly multileaf collimator for radiotherapy." Title page, table of contents and abstract only, 2000. http://web4.library.adelaide.edu.au/theses/09PH/09phg81659.pdf.

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Bibliography: leaves 241-250. A multileaf collimator for radiation therapy has been designed that splits each leaf bank into two vertically displaced assemblies or levels with each level consisting of alternate leaves and leaf spaces. The radiation profiles transmitted for image formation through the collimator design were investigated to examine their dependence on the collimator design features.

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2

Örn, Rafaela. "Measurement and modeling of the Multileaf collimator MLCi2." Thesis, KTH, Fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254434.

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3

Williams, Matthew John Physics Faculty of Science UNSW. "Investigations into static multileaf collimator based intensity modulated radiotherapy." Awarded by:University of New South Wales. Physics, 2005. http://handle.unsw.edu.au/1959.4/20577.

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Intensity Modulated Radiation Therapy (IMRT) is a modern radiotherapy treatment technique used to obtain highly conformal dose distributions. The delivery of IMRT is commonly achieved through the use of a multileaf collimator (MLC). One of the hindrances at present to the widespread use of IMRT is the increased time required for its planning, delivery and verification. In this thesis one particular method of MLC based IMRT, known as Static Multileaf Collimator based IMRT (SMLC-IMRT), has been studied along with methods for improving it???s delivery efficiency. The properties of an MLC comm

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4

Gélinas, Dominic. "Commissioning a dynamic multileaf collimator on a linear accelerator." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0023/MQ50775.pdf.

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5

Krauß, Andreas [Verfasser], and Uwe [Akademischer Betreuer] Oelfke. "Compensation of intra-fractional organ motion through multileaf collimator tracking / Andreas Krauß ; Betreuer: Uwe Oelfke." Heidelberg : Universitätsbibliothek Heidelberg, 2012. http://d-nb.info/1179783794/34.

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6

Inokuchi, Haruo. "Clinical effect of multileaf collimator width on the incidence of late rectal bleeding after high-dose intensity-modulated radiotherapy for localized prostate carcinoma." Kyoto University, 2016. http://hdl.handle.net/2433/215942.

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7

Moreno, Miriam Zarza. "Monte Carlo simulations for dosimetric verification in photon and electron beam radiotherapy." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/7835.

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Dissertação para obtenção do Grau de Doutor em Engenharia Biomédica<br>One of the primary requirements for successful radiotherapy treatments is the accurate calculation of dose distributions in the treatment planning process. Monte Carlo (MC) dose calculation algorithms are currently recognized as the most accurate method to meet this requirement and to increase even further dose accuracy. The improvements in computer processor technology and the development of variance reduction techniques for calculations have led to the recent implementation and use of MC algorithms for radiotherapy tre

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8

Rice, Brandon. "Methods for producing off-axis ratio tables from mini-multileaf collimator shaped circular fields for input into a stereotactic radiosurgery treatment planning system." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010840.

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9

Barker, Jennifer. "A comparison study of multileaf and micro-multileaf collimators /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31188.

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The dosimetric characteristics of a standard Varian 52-leaf multileaf collimator (MLC) and BrainLAB m3 micro-multileaf collimator (micro-MLC) have been investigated for square, rectangular, and irregular fields for 6 MV and 18 MV photon beams provided by a Varian Clinac 2300 C/D linear accelerator (linac). The percentage depth dose data and the conventional collimator factor are unaffected by the addition of MLC or micro-MLC shaped field unless, in the latter case, the tertiary field is much less than the jaw setting. However, relative dose factors for a given MLC or micro-MLC field size depen

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10

Kamath, Srijit. "Algorithms for sequencing multileaf collimators." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0011548.

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11

Morel, Paul. "MSPT : Motion Simulator for Proton Therapy." Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1094/document.

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En proton thérapie, la technique de balayage, permet de traiter efficacement le patient vis à vis de l'irradiation de la tumeur et la protection des tissus sains. Ces bénéfices dosimétriques peuvent cependant être grandement dégradés par les mouvements intra-fraction. Par conséquent, l'étude de méthodes d'atténuation ou d'adaptation est nécessaire. C'est pour cela, que nous avons développé un logiciel ”open-source” de calcul et d'évaluation de dose en 4D, MSPT (Motion Simulator for Proton Therapy), pour la technique de balayage. Son but est de mettre en avant l'impact des mouvements intra-frac

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12

Kamath, Srijit. "Leaf sequencing algorithms for segmented multileaf collimation." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE1001155.

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13

MacKenzie, Marc Alexander. "Intensity modulated arc therapy technique using sliding window dynamic multileaf collimation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0014/NQ59624.pdf.

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14

Marinos, Nikolas L. "Monte Carlo calculations and measurement of photon beams shaped by multileaf collimators in radiation therapy." Thesis, Queen Mary, University of London, 1999. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1747.

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A model based on Monte Carlo techniques is developed to transport ionising radiation through the radiation head of a 6MV linear accelerator fitted with multileaf collimators Major emphasis is given to the detailed geometrical descriptiqn of the multileaf collimator. The model produces dose distributions in water from photon beams defined by the jaws and the multileaf collimator. The model accounts for contaminant electrons in the photon beam, off-axis x-ray radiation originating at the collimator and the transmission and penumbra effects of the side planes and front face of the leaves in the m

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15

Williams, Matthew John. "Investigations into static multileaf collimator based intensity modulated radiotherapy /." 2004. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20050323.104431/index.html.

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16

Rule, Ayron Edward. "Linear accelerator multileaf collimator quality control methodologies in radiotherapy." Thesis, 2016. http://hdl.handle.net/10539/21034.

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A Dissertation submitted to the faculty of science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. May 2016<br>The multileaf collimator (MLC) system introduction into clinical linear accelerators (Linacs), facilitated computer-control and verification of complex treatment, and results in an increase in patient set up speed. An MLC system thus requires a re-evaluation of the quality assurance (QA) requirements for beam collimation. This study investigated, developed, performed and evaluated QA effors for conventional

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17

Lin, Yen-Ling, and 林彥伶. "Leaf Sequence Algorithm for Multileaf Collimator in Intensity Modulated Radiation Therapy." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/31748485805066707106.

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碩士<br>國立清華大學<br>工業工程與工程管理學系<br>96<br>Radiation therapy is a common treatment for some specific tumors in the treatment of cancer now. In recent years, there has been a new development in radiation therapy, which is called intensity modulated radiation therapy (IMRT). The outstanding advantage of IMRT is it can modulate the intensity of the radiation beam effectively, and focus a higher radiation dose on the tumor while minimizing radiation exposure to surrounding normal tissues. Multileaf Collimator (MLC) is one of the essential equipments when IMRT is executed. MLC is composed by several pair

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18

Otto, Karl. "Intensity modulation of therapeutic photon beams using a rotating multileaf collimator." Thesis, 2003. http://hdl.handle.net/2429/14891.

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This thesis describes the development and implementation of a novel method of delivering intensity modulated radiation therapy (IMRT) that provides greater accuracy and spatial resolution than currently available methods. Through improvements in multileaf collimator (MLC) based fluence generation, a dose distribution may be generated that conforms more closely to the tumour target volume. Healthy tissue surrounding the target volume will therefore receive less dose, reducing the probability of side effects and allowing the physician to increase the prescribed tumour dose (dose escalatio

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19

Huang, K. W., and 黃光偉. "Uniformity Study In Dose Delivery With Multileaf Collimator In Radiation Therapy." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/62546453352552155448.

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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>Dose uniformity is directly related to tumor control probability (TCP) and normal tissue complication probability (NTCP). An ideal situation is one in which a uniform high dose is focused on the tumor target region and normal tissue surrounding the target volume receives minimal radiation. Dose distribution and uniformity must take into account the irregular contours and density changes within the body, especially the head, neck, and breast. A physical wedge has been used to compensate for irregular contours during traditional treatment, but a physical wedge

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20

Yao, Chun-Chou, and 姚俊州. "The Physical Properties and Dosimetric Analyses of Multileaf/Cone Collimator for Cyberknife Stereotactic Radiosurgery." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/97vsgg.

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碩士<br>國立高雄應用科技大學<br>電機工程系博碩士班<br>104<br>Purpose: To evaluate and quantify the dosimetric and physical benefits on CyberKnife M6 for stereotactic radiosurgery (SRS). Materials and methods: Three different collimators treatment technologies were analyzed, including the treatment with a dynamic multileaf collimator (MLC), a fixed cone collimator, and a variable aperture collimator (IRIS). We aimed to analyze the physical characteristics of output factors and physical profiles of different field sizes. In order to apply these physical characteristics to clinical treatment, this study used a Rando

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21

Τσολάκη, Ευαγγελία. "Simulation design and characteristics of multileaf collimators at rotational radiotherapy." Thesis, 2008. http://nemertes.lis.upatras.gr/jspui/handle/10889/1748.

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In treatment of cancer using high energetic radiation the problem arises how to irradiate the tumor without damaging the healthy tissue in the immediate vicinity. In order to do this, intensity modulated radiation therapy (IMRT) is used. In this thesis, the general goal is to modulate the homogeneous radiation field delivered by an external accelerator using a multileaf collimator in comparison with beam modifying devices. In order to generate intensity modulated fields in a static mode with multileaf collimators, the heuristic algorithm of Galvin, Chen and Smith is used. This method aims at

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22

Daartz, Juliane [Verfasser]. "Opportunities and limitations of multileaf collimator based intensity modulated proton therapy / presented by Juliane Daartz." 2011. http://d-nb.info/1012848507/34.

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23

Baatar, Davaatseren [Verfasser]. "Matrix decomposition with times and cardinality objectives : theory, algorithms and application to multileaf collimator sequencing / Davaatseren Baatar." 2006. http://d-nb.info/97917595X/34.

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24

Chen, Ho-Hsing, and 陳合興. "Modification of leaf sequences of dynamic multileaf collimator in radiotherapy: respiratory motion target tracking and total body irradiation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/02949380177286448729.

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博士<br>國立清華大學<br>生醫工程與環境科學系<br>101<br>we applied an aperture adaptive technique with a visual guiding system to tackle the problem of respiratory motion. A homemade computer program showing a cyclic respiratory pattern was projected onto the ceiling to visually help the patient adjust their respiration. Once the respiratory motion became regular, the leaf sequence could be synchronized with the target motion. An oscillator was employed to simulate the patient’s breathing pattern. Two simple ﬁelds and one IMRT ﬁeld were measured to verify the accuracy. Preliminary results showed that after appro

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25

"Spinal radiation oncology using a conventional linear accelerator with add-on multileaf collimator and image-guided patient positioning system." 2013. http://library.cuhk.edu.hk/record=b5884491.

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Ngar, Yuen Kan.<br>Thesis (Ph.D.)--Chinese University of Hong Kong, 2013.<br>Includes bibliographical references (leaves 157-159).<br>Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.<br>Abstract also in Chinese.

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26

CHEN, HO-LING, and 陳鶴齡. "Comparison of Varian TrueBeam Linear Accelerator Multileaf Collimator Tongue and Groove Effect Dose Leakage Using Monte Carlo Simulation and Gafchromic EBT3." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/x6z95x.

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碩士<br>慈濟科技大學<br>放射醫學科學研究所<br>107<br>The tongue and groove design of the multi-leaf collimator (MLC) of the linear accelerator (LINAC) may result in the radiation leakage. In this study, the Varian TrueBeamTM phase space particle files were used to construct the Millennium 120 multi-leaf collimator module for Monte Carlo simulations of such tongue and groove effect. The simulations have been carried out in conditions of different energies, field sizes, depths, and two different LINAC modes, i.e., the flattening filter (FF) and the flattening filter free (FFF) modes. The leakages were also measu

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27

Valente, Rui Guilherme da Silva. "Computational methods for beam angle optimization in intensity modulated radiotherapy." Master's thesis, 2018. http://hdl.handle.net/10316/86747.

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Dissertação de Mestrado em Matemática apresentada à Faculdade de Ciências e Tecnologia<br>Este trabalho aborda um problema de otimização relacionado com o tratamento de estruturas tumorais, conhecido por Radioterapia de Intensidade Modulada. Este método de tratamento baseia-se na incidência de radiação raio-X, que visa destruir as células malignas, preservando, na medida do possível, os órgãos vitais circundantes. Este texto analisa este tipo de tratamento e seu planeamento com o objetivo de tornar eficaz sua aplicação.Radioterapia é um tratamento médico que consiste em utilizar radiação ioniz

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28

奥村, 雅彦. "放射線治療用直線加速器におけるdynamic multileaf collimator の限界速度および位置精度評価に関する研究". Thesis, 2011. http://hdl.handle.net/2237/14837.

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29

Tacke, Martin [Verfasser]. "Adaption of high-precision radiotherapy to moving target volumes in real-time using dynamic multileaf collimators / presented by Martin Tacke." 2009. http://d-nb.info/993061729/34.

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