Download or read book Adjoint Based Treatment Planning for Brachytherapy written by Vibha Chaswal and published by . This book was released on 2008 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimization of Brachytherapy Treatment Planning Using Adjoint Functions written by Sua Yoo and published by . This book was released on 2003 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Adjoint Method for The Optimization of Brachytherapy and Radiotherapy Patient Treatment Planning Procedures Using Monte Carlo Calculations written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this project is to investigate the use of the adjoint method, commonly used in the reactor physics community, for the optimization of radiation therapy patient treatment plans. Two different types of radiation therapy are being examined, interstitial brachytherapy and radiotherapy. In brachytherapy radioactive sources are surgically implanted within the diseased organ such as the prostate to treat the cancerous tissue. With radiotherapy, the x-ray source is usually located at a distance of about 1-metere from the patient and focused on the treatment area. For brachytherapy the optimization phase of the treatment plan consists of determining the optimal placement of the radioactive sources, which delivers the prescribed dose to the disease tissue while simultaneously sparing (reducing) the dose to sensitive tissue and organs. For external beam radiation therapy the optimization phase of the treatment plan consists of determining the optimal direction and intensity of beam, which provides complete coverage of the tumor region with the prescribed dose while simultaneously avoiding sensitive tissue areas. For both therapy methods, the optimal treatment plan is one in which the diseased tissue has been treated with the prescribed dose and dose to the sensitive tissue and organs has been kept to a minimum.

Download or read book Treatment Planning of High Dose Rate Brachytherapy Mathematical Modelling and Optimization written by Björn Morén and published by Linköping University Electronic Press. This book was released on 2021-01-12 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cancer is a widespread class of diseases that each year affects millions of people. It is mostly treated with chemotherapy, surgery, radiation therapy, or combinations thereof. High doserate (HDR) brachytherapy (BT) is one modality of radiation therapy, which is used to treat for example prostate cancer and gynecologic cancer. In BT, catheters (i.e., hollow needles) or applicators are used to place a single, small, but highly radioactive source of ionizing radiation close to or within a tumour, at dwell positions. An emerging technique for HDR BT treatment is intensity modulated brachytherapy (IMBT), in which static or dynamic shields are used to further shape the dose distribution, by hindering the radiation in certain directions. The topic of this thesis is the application of mathematical optimization to model and solve the treatment planning problem. The treatment planning includes decisions on catheter placement, that is, how many catheters to use and where to place them, as well as decisions for dwell times. Our focus is on the latter decisions. The primary treatment goals are to give the tumour a sufficiently high radiation dose while limiting the dose to the surrounding healthy organs, to avoid severe side effects. Because these aims are typically in conflict, optimization models of the treatment planning problem are inherently multiobjective. Compared to manual treatment planning, there are several advantages of using mathematical optimization for treatment planning. First, the optimization of treatment plans requires less time, compared to the time-consuming manual planning. Secondly, treatment plan quality can be improved by using optimization models and algorithms. Finally, with the use of sophisticated optimization models and algorithms the requirements of experience and skill level for the planners are lower. The use of optimization for treatment planning of IMBT is especially important because the degrees of freedom are too many for manual planning. The contributions of this thesis include the study of properties of treatment planning models, suggestions for extensions and improvements of proposed models, and the development of new optimization models that take clinically relevant, but uncustomary aspects, into account in the treatment planning. A common theme is the modelling of constraints on dosimetric indices, each of which is a restriction on the portion of a volume that receives at least a specified dose, or on the lowest dose that is received by a portion of a volume. Modelling dosimetric indices explicitly yields mixed-integer programs which are computationally demanding to solve. We have therefore investigated approximations of dosimetric indices, for example using smooth non-linear functions or convex functions. Contributions of this thesis are also a literature review of proposed treatment planning models for HDR BT, including mathematical analyses and comparisons of models, and a study of treatment planning for IMBT, which shows how robust optimization can be used to mitigate the risks from rotational errors in the shield placement. Cancer är en grupp av sjukdomar som varje år drabbar miljontals människor. De vanligaste behandlingsformerna är cellgifter, kirurgi, strålbehandling eller en kombination av dessa. I denna avhandling studeras högdosrat brachyterapi (HDR BT), vilket är en form av strålbehandling som till exempel används vid behandling av prostatacancer och gynekologisk cancer. Vid brachyterapibehandling används ihåliga nålar eller applikatorer för att placera en millimeterstor strålkälla antingen inuti eller intill en tumör. I varje nål finns det ett antal så kallade dröjpositioner där strålkällan kan stanna en viss tid för att bestråla den omkringliggande vävnaden, i alla riktningar. Genom att välja lämpliga tider för dröjpositionerna kan dosfördelningen formas efter patientens anatomi. Utöver HDR BT studeras också den nya tekniken intensitetsmodulerad brachyterapi (IMBT) vilket är en variation på HDR BT där skärmning används för att minska strålningen i vissa riktningar vilket gör det möjligt att forma dosfördelningen bättre. Planeringen av en behandling med HDR BT omfattar hur många nålar som ska användas, var de ska placeras samt hur länge strålkällan ska stanna i de olika dröjpositionerna. För HDR BT kan dessa vara flera hundra stycken medan det för IMBT snarare handlar om tusentals möjliga kombinationer av dröjpositioner och inställningar av skärmarna. Planeringen resulterar i en dosplan som beskriver hur hög stråldos som tumören och intilliggande frisk vävnad och riskorgan utsätts för. Dosplaneringen kan formuleras som ett matematiskt optimeringsproblem vilket är ämnet för avhandlingen. De övergripande målsättningarna för behandlingen är att ge en tillräckligt hög stråldos till tumören, för att döda alla cancerceller, samt att undvika att bestråla riskorgan eftersom det kan ge allvarliga biverkningar. Då alla målsättningarna inte samtidigt kan uppnås fullt ut så fås optimeringsproblem där flera målsättningar behöver prioriteras mot varandra. Utöver att dosplanen uppfyller kliniska behandlingsriktlinjer så är också tidsaspekten av planeringen viktig eftersom det är vanligt att den görs medan patienten är bedövad eller sövd. Vid utvärdering av en dosplan används dos-volymmått. För en tumör anger ett dosvolymmått hur stor andel av tumören som får en stråldos som är högre än en specificerad nivå. Dos-volymmått utgör en viktig del av målen för dosplaner som tas upp i kliniska behandlingsriktlinjer och ett exempel på ett sådant mål vid behandling av prostatacancer är att 95% av prostatans volym ska få en stråldos som är minst den föreskrivna dosen. Dos-volymmått utläses ur de kliniskt betydelsefulla dos-volym histogrammen som för varje stråldosnivå anger motsvarande volym som erhåller den dosen. En fördel med att använda matematisk optimering för dosplanering är att det kan spara tid jämfört med manuell planering. Med väl utvecklade modeller så finns det också möjlighet att skapa bättre dosplaner, till exempel genom att riskorganen nås av en lägre dos men med bibehållen dos till tumören. Vidare så finns det även fördelar med en process som inte är lika personberoende och som inte kräver erfarenhet i lika stor utsträckning som manuell dosplanering i dagsläget gör. Vid IMBT är det dessutom så många frihetsgrader att manuell planering i stort sett blir omöjligt. I avhandlingen ligger fokus på hur dos-volymmått kan användas och modelleras explicit i optimeringsmodeller, så kallade dos-volymmodeller. Detta omfattar såväl analys av egenskaper hos befintliga modeller, utvidgningar av tidigare använda modeller samt utveckling av nya optimeringsmodeller. Eftersom dos-volymmodeller modelleras som heltalsproblem, vilka är beräkningskrävande att lösa, så är det också viktigt att utveckla algoritmer som kan lösa dem tillräckligt snabbt för klinisk användning. Ett annat mål för modellutvecklingen är att kunna ta hänsyn till fler kriterier som är kliniskt relevanta men som inte ingår i dos-volymmodeller. En sådan kategori av mått är hur dosen är fördelad rumsligt, exempelvis att volymen av sammanhängande områden som får en alldeles för hög dos ska vara liten. Sådana områden går dock inte att undvika helt eftersom det är typiskt för dosplaner för brachyterapi att stråldosen fördelar sig ojämnt, med väldigt höga doser till små volymer precis intill strålkällorna. Vidare studeras hur små fel i inställningarna av skärmningen i IMBT påverkar dosplanens kvalitet och de olika utvärderingsmått som används kliniskt. Robust optimering har använts för att säkerställa att en dosplan tas fram som är robust sett till dessa möjliga fel i hur skärmningen är placerad. Slutligen ges en omfattande översikt över optimeringsmodeller för dosplanering av HDR BT och speciellt hur optimeringsmodellerna hanterar de motstridiga målsättningarna.

Download or read book Mathematical Modelling of Dose Planning in High Dose Rate Brachytherapy written by Björn Morén and published by Linköping University Electronic Press. This book was released on 2019-04-24 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cancer is a widespread type of diseases that each year affects millions of people. It is mainly treated by chemotherapy, surgery or radiation therapy, or a combination of them. One modality of radiation therapy is high dose-rate brachytherapy, used in treatment of for example prostate cancer and gynecologic cancer. Brachytherapy is an invasive treatment in which catheters (hollow needles) or applicators are used to place the highly active radiation source close to or within a tumour. The treatment planning problem, which can be modelled as a mathematical optimization problem, is the topic of this thesis. The treatment planning includes decisions on how many catheters to use and where to place them as well as the dwell times for the radiation source. There are multiple aims with the treatment and these are primarily to give the tumour a radiation dose that is sufficiently high and to give the surrounding healthy tissue and organs (organs at risk) a dose that is sufficiently low. Because these aims are in conflict, modelling the treatment planning gives optimization problems which essentially are multiobjective. To evaluate treatment plans, a concept called dosimetric indices is commonly used and they constitute an essential part of the clinical treatment guidelines. For the tumour, the portion of the volume that receives at least a specified dose is of interest while for an organ at risk it is rather the portion of the volume that receives at most a specified dose. The dosimetric indices are derived from the dose-volume histogram, which for each dose level shows the corresponding dosimetric index. Dose-volume histograms are commonly used to visualise the three-dimensional dose distribution. The research focus of this thesis is mathematical modelling of the treatment planning and properties of optimization models explicitly including dosimetric indices, which the clinical treatment guidelines are based on. Modelling dosimetric indices explicitly yields mixedinteger programs which are computationally demanding to solve. The computing time of the treatment planning is of clinical relevance as the planning is typically conducted while the patient is under anaesthesia. Research topics in this thesis include both studying properties of models, extending and improving models, and developing new optimization models to be able to take more aspects into account in the treatment planning. There are several advantages of using mathematical optimization for treatment planning in comparison to manual planning. First, the treatment planning phase can be shortened compared to the time consuming manual planning. Secondly, also the quality of treatment plans can be improved by using optimization models and algorithms, for example by considering more of the clinically relevant aspects. Finally, with the use of optimization algorithms the requirements of experience and skill level for the planners are lower. This thesis summary contains a literature review over optimization models for treatment planning, including the catheter placement problem. How optimization models consider the multiobjective nature of the treatment planning problem is also discussed.

Download or read book Khan s Treatment Planning in Radiation Oncology written by Faiz M. Khan and published by Lippincott Williams & Wilkins. This book was released on 2016-05-11 with total page 1475 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique, full-color reference offers a total team approach to radiation oncology treatment planning, incorporating the newest imaging techniques and offering a comprehensive discussion of clinical, physical, biological and technical aspects. A clear focus on the application of physical and clinical concepts to solve treatment planning problems helps you provide effective, state-of-the-art care for cancer patients. With authoritative coverage of the latest in sophisticated radiation oncology treatment modalities, the 4th Edition of Khan’s Treatment Planning in Radiation Oncology is an essential resource for the radiation oncologist, medical physicist, dosimetrist, and radiation therapist.

Download or read book Brachytherapy written by Phillip M. Devlin and published by Lippincott Williams & Wilkins. This book was released on 2007 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the foremost experts in the field, this volume is a comprehensive text and practical reference on contemporary brachytherapy. The book provides detailed, site-specific information on applications and techniques of brachytherapy in the head and neck, central nervous system, breast, thorax, gastrointestinal tract, and genitourinary tract, as well as on gynecologic brachytherapy, low dose rate and high dose rate sarcoma brachytherapy, vascular brachytherapy, and pediatric applications. The book thoroughly describes and compares the four major techniques used in brachytherapy—intracavity, interstitial, surface-dose or mold therapy, and transluminal. Chapters detail particular techniques that are appropriate in specific clinical situations.

Download or read book Handbook of Image Guided Brachytherapy written by Jyoti Mayadev and published by Springer. This book was released on 2017-03-21 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides a clinically relevant, succinct, and comprehensive overview of image-guided brachytherapy. Throughout the last decade, the utility of image guidance in brachytherapy has increased to enhance procedural development, treatment planning, and radiation delivery in an effort to optimize safety and clinical outcomes. Organized into two parts, the book discusses physics and radiobiology principles of brachytherapy as well as clinical applications of image-guided brachytherapy for various disease sites (central nervous system, eye, head and neck, breast, lung, gastrointestinal, genitourinary, gynecologic, sarcoma, and skin). It also describes the incorporation of imaging techniques such as CT, MRI, and ultrasound into brachytherapy procedures and planning. Featuring procedural and anesthesia care, extensive images, contouring examples, treatment planning techniques, and dosimetry for the comprehensive treatment for each disease site, Handbook of Image-Guided Brachytherapy is a valuable resource for practicing radiation oncologists, physicists, dosimetrists, residents, and medical students.

Download or read book Simulation based Low dose rate Brachytherapy Treatment Planning written by Katharina I. Jerg and published by . This book was released on 2024* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Treatment Planning in Radiation Oncology written by Neil M. Woody, MD and published by Demos Medical Publishing. This book was released on 2014-08-14 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a highly practical resource about the specific technical aspects of delivering radiation treatment. Pocket-sized and well organized for ease of use, the book is designed to lead radiation oncology trainees and residents step by step through the basics of radiotherapy planning and delivery for all major malignancies. This new, evidence-based edition retains the valued, practical features of the first edition while incorporating recent advances in the field. Chapters are the result of a joint collaboration between residents and staff radiation oncologists in the Department of Radiation Oncology at the Cleveland Clinic. Sections are organized by body site or systemówhichever is best suited to consistency in presenting planning principles. Also included are such specialized topics as palliative therapy and pediatrics. More than 200 images help to clarify the steps of radiotherapy planning and delivery. Written by and for residents on the "front lines" of their training, it is also a valuable resource for training other professionals in the field such as technologists, nurses, dosimetrists, and others as well as a quick reference for practicing physicians. Key Features of Handbook of Treatment Planning in Radiation Oncology, Second Edition: Provides a consistent, step-by-step approach to effective radiotherapy planning and delivery Presents content in consistent, concise, bulleted format for easy review Includes over 200 color images Explains specific technical aspects of delivering radiation treatment Addresses such specialized topics as palliative therapy and pediatrics New to the Second Edition: Sereotactic body radiation therapy (SBRT) for prostate and GI tumors Intraoperative therapy for GI tumors Volumetric modulated arc therapy (VMAT) for brain tumors New coverage of MRI based planning in simulation

Download or read book Comprehensive Brachytherapy written by Jack Venselaar and published by Taylor & Francis. This book was released on 2012-11-08 with total page 523 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern brachytherapy is one of the most important oncological treatment modalities requiring an integrated approach that utilizes new technologies, advanced clinical imaging facilities, and a thorough understanding of the radiobiological effects on different tissues, the principles of physics, dosimetry techniques and protocols, and clinical expertise. A complete overview of the field, Comprehensive Brachytherapy: Physical and Clinical Aspects is a landmark publication, presenting a detailed account of the underlying physics, design, and implementation of the techniques, along with practical guidance for practitioners. Bridging the gap between research and application, this single source brings together the technological basis, radiation dosimetry, quality assurance, and fundamentals of brachytherapy. In addition, it presents discussion of the most recent clinical practice in brachytherapy including prostate, gynecology, breast, and other clinical treatment sites. Along with exploring new clinical protocols, it discusses major advances in imaging, robotics, dosimetry, Monte Carlo-based dose calculation, and optimization.

Download or read book The Design and Implementation of an MR Based 3 dimensional Stereotactic Brachytherapy Treatment Planning System Using Object Oriented Programming Language written by Donna B. Trotter and published by . This book was released on 1996 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radiotherapy in Practice Brachytherapy written by Peter Hoskin and published by Oxford University Press. This book was released on 2011-01-27 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides practical guidance on the use of brachytherapy. Each chapter gives the reader a solid background in the physics and dosimetry of the technique, followed by practical information on its use in common disease sites.

Download or read book Treatment Planning and Dose Calculation in Radiation Oncology written by Gunilla C. Bentel and published by Elsevier. This book was released on 2014-02-20 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatment Planning and Dose Calculation in Radiation Oncology, Third Edition describes the treatment methods and technical guides as models of contemporary radiation therapy. These models should be modified for each individual patient to yield a best fit to the disease being treated and the radiation sources employed. This book is composed of seven chapters, and begins with an overview of the elements of clinical radiation oncology. The subsequent chapter deals with the production, interaction, and measurement of radiation. These topics are followed by intensive discussions of dose calculation for external beams and pretreatment procedures of radiation therapy. A chapter looks into the principles, apparatus, and dose calculation in brachytherapy. The final chapters describe the principles and practical applications of treatment planning. This book will be of value to radiation oncologists.

Download or read book Brachytherapy written by Yasuo Yoshioka and published by Springer. This book was released on 2018-08-01 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and up-to-date overview of major technical advances and research findings in the field of brachytherapy. Especially research conducted on brachytherapy in Japan has made tremendous strides, offering readers valuable insights into new treatment outcomes, evidence and techniques. In the respective chapters, each author elucidates cutting-edge findings, addressing both the basic and clinical aspects including the application to various cancers, and especially focusing on highly valuable data gleaned in Japan. As such, the book will benefit not only radiation oncologists but also basic researchers, radiation technologists, medical physicists and members of medical staff who are involved in the development and utilization of this advanced therapy.

Download or read book Emerging Technologies in Brachytherapy written by William Y. Song and published by CRC Press. This book was released on 2017-05-19 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: Brachytherapy is continuously advancing. Years of accumulated experience have led to clinical evidence of its benefit in numerous clinical sites such as gynecological, prostate, breast, rectum, ocular, and many other cancers. Brachytherapy continues to expand in its scope of practice and complexity, driven by strong academic and commercial research, by advances in competing modalities, and due to the diversity in the political and economic landscape. It is a true challenge for practicing professionals and students to readily grasp the overarching trends of the field, especially of those technologies and innovative practices that are not yet established but are certainly on the rise. Addressing this challenge, Emerging Technologies in Brachytherapy presents a comprehensive collection of chapters on the latest trending/emerging technologies and expert opinions. It is divided into five broad sections: Section I: Physics of Brachytherapy Section II: Imaging for Brachytherapy Guidance Section III: Brachytherapy Suites Section IV: Is Brachytherapy a Competitive Modality? Section V: Vision 20/20: Industry Perspective Each section has a carefully selected collection of chapters, which covers the spectrum of topics in comprehensive detail. By drawing on recognized experts and key opinion leaders from academia and commercial sectors worldwide (100+ contributors), Emerging Technologies in Brachytherapy provides readers with a wealth of relevant information needed to comprehend the rapidly advancing technologies and trends of today and the prospects for the future.

Download or read book Dosimetry in Brachytherapy An International Code of Practice for Secondary Standards Dosimetry Laboratories and Hospitals written by IAEA and published by International Atomic Energy Agency. This book was released on 2023-12-22 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The brachytherapy process requires consistent reference dosimetry that is traceable to metrological primary standards and common procedures to be followed for reference dosimetry globally. The Code of Practice is addressed to both Secondary Standards Dosimetry Laboratories and hospitals. It fulfills the need for a systematic and internationally unified approach to the calibration and use of vented well-type re-entrant ionisation chambers in determining the strength of brachytherapy sources with intensities measurable by such detectors. The dosimetry formalism as well as common procedures for calibration, reference dosimetry, reference-class instrument assessment and commissioning of the well-type ionisation chamber system are provided.