Download or read book Evaluation of a Deterministic Boltzmann Solver for Radiation Therapy Dose Calculations Involving High density Hip Prostheses written by Samantha A. M. Lloyd and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Acuros External Beam (Acuros XB) is a new radiation dose calculation algorithm available as part of Varian Medical Systems' radiotherapy treatment planning system, ECLIPSE. Acuros XB calculates dose distributions by finding the deterministic solution to the linear Boltzmann transport equation which governs the transport of particles or radiation through matter. Among other things, Acuros XB claims an ability to accurately model dose perturbations due to increased photon and electron scatter within a high-density volume, such as a hip prosthesis. Until now, the only way to accurately model high-density scatter was with a Monte Carlo simulation which gives the stochastic solution to the same transport equation, but is time and computationally expensive. In contrast, Acuros XB solves the transport equation at time scales appropriate for clinical use. An evaluation of Acuros XB for radiation dose calculations involving high-density objects was undertaken using EGSnrc based Monte Carlo as the benchmark. Calculations were performed for geometrically ideal virtual phantoms, water tank phantoms containing cylindrical steel rods and hip prostheses, and for a clinical prostate treatment plan involving a unilateral prosthetic hip. The anisotropic analytical algorithm (AAA), a convolution-superposition algorithm used for treatment planning at the British Columbia Cancer Agency's Vancouver Island Center, was also used to illustrate the limitations of current radiotherapy planning tools. In addition, to verify the qualitative properties of dose perturbations due to high-density volumes, film measurements were taken and compared to Monte Carlo, Acuros XB and AAA data. Dose distributions calculated with Acuros XB agree very well with distributions calculated with Monte Carlo. Gamma-analyses performed at 2% and 2 mm using Monte Carlo as the reference dose were within tolerance for 92-99% of voxels considered. AAA, on the other hand, was within tolerance for 61-97% of voxels considered under the same gamma-constraints. For the clinical prostate plan, AAA produced localized dose underestimates that were absent when calculated by Acuros XB. As well, both Monte Carlo and Acuros XB showed very good agreement with the film measurements, while AAA showed large discrepancies at and beyond the location of measured dose perturbations. Acuros XB has been shown to handle does perturbations due to high-density volumes as well as Monte Carlo, at clinically appropriate time scales, and better than the current algorithm used for treatment planning at the Vancouver Island Center.
Download or read book Evaluation of a Deterministic Boltzmann Solver for Radiation Therapy Dose Calculations Involving High density Hip Prostheses written by Samantha A. M. Lloyd and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Walter and Miller s Textbook of Radiotherapy Radiation Physics Therapy and Oncology E Book written by R Paul Symonds and published by Elsevier Health Sciences. This book was released on 2019-07-11 with total page 641 pages. Available in PDF, EPUB and Kindle. Book excerpt: Walter and Miller’s Textbook of Radiotherapy is a key textbook for therapeutic radiography students as well as trainee clinical and medical oncologists, clinical physicists and technologists. The book is divided into 2 sections. The first section covers physics and provides a comprehensive review of radiotherapy physics. This section is designed to be non-physicist friendly, to simply and clearly explain the physical principles upon which radiotherapy and its technology are based. The second section is a systematic review by tumour site giving an up to date summary of radiotherapy practice. The title also covers the place of chemotherapy, surgery and non-radiotherapy treatments as well as the principles of cancer patient treatment including supportive care and palliative treatments. It is a comprehensive must-have resource for anyone studying therapeutic radiotherapy. Highly illustrated in full colour including 350 photographs. Clearly and simply explains the fundamental physics for clinicians Gives an up to date summary of radiotherapy practice organised by tumour site making it very easy to navigate. Describes the wide range of devices and clearly explains the principles behind their operation. Comprehensively explains the calculation models of dose predictions for treatment preparation. Heavy emphasis on how clinical trials have influenced current practice. Shows how radiobiological knowledge has influenced current practice such as the fractionation regimens for breast and prostate cancer Proton therapy; machines, dose measurement, covering the clinical advantages and pitfalls of this treatment modality. New radiotherapy modalities such as stereotactic radiotherapy, types of intensity modulated radiotherapy and imaged guided radiotherapy are comprehensively covered as are recent advances in chemotherapy and molecular targeted therapy. In depth coverage of dose measurement and new devices.
Download or read book Development of Fast Deterministic Solvers for the Boltzmann Equation written by Truong Nguyen and published by . This book was released on 2015 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas flows in hyper-sonic air breathing engines and rocket thrusters and flows of particles into vacuum contain regions where the distribution of particle velocities deviates significantly from the Maxwellian distribution. The gas in these regions is said to be in the non-continuum state and its evolution is best described using kinetic equations. The most physically accurate model of non-continuum gas is given by the Boltzmann kinetic equation. However, because of the very high computational costs associated with the evaluation of the collision integral, solution of the Boltzmann equation is used sparingly. Simpler approximate models are often desired in simulations of non-continuum flows in multidimensional applications. However, validating simpler models may be not easy when experimental data is not available. The goal of thesis is to develop novel capabilities for high-fidelity simulation of non-continuum flows with guaranteed accuracy. We will address the our goal by developing fast solvers for the Boltzmann equation using sparse Galerkin approximations of the velocity distribution function and by evaluating accuracy of these solvers using parallel fully deterministic discontinuous Galerkin (DG) Boltzmann solver.
Download or read book Deterministic Solvers for the Boltzmann Transport Equation written by Sung-Min Hong and published by Springer. This book was released on 2011-07-31 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book covers all aspects from the expansion of the Boltzmann transport equation with harmonic functions to application to devices, where transport in the bulk and in inversion layers is considered. The important aspects of stabilization and band structure mapping are discussed in detail. This is done not only for the full band structure of the 3D k-space, but also for the warped band structure of the quasi 2D hole gas. Efficient methods for building the Schrödinger equation for arbitrary surface or strain directions, gridding of the 2D k-space and solving it together with the other two equations are presented.
Download or read book On Study of Deterministic Conservative Solvers for the Nonlinear Boltzmann and Landau Transport Equations written by Chenglong Zhang and published by . This book was released on 2014 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Boltzmann Transport Equation (BTE) has been the keystone of the kinetic theory, which is at the center of Statistical Mechanics bridging the gap between the atomic structures and the continuum-like behaviors. The existence of solutions has been a great mathematical challenge and still remains elusive. As a grazing limit of the Boltzmann operator, the Fokker-Planck-Landau (FPL) operator is of primary importance for collisional plasmas. We have worked on the following three different projects regarding the most important kinetic models, the BTE and the FPL Equations. (1). A Discontinuous Galerkin Solver for Nonlinear BTE. We propose a deterministic numerical solver based on Discontinuous Galerkin (DG) methods, which has been rarely studied. As the key part, the weak form of the collision operator is approximated within subspaces of piecewise polynomials. To save the tremendous computational cost with increasing order of polynomials and number of mesh nodes, as well as to resolve loss of conservations due to domain truncations, the following combined procedures are applied. First, the collision operator is projected onto a subspace of basis polynomials up to first order. Then, at every time step, a conservation routine is employed to enforce the preservation of desired moments (mass, momentum and/or energy), with only linear complexity. The asymptotic error analysis shows the validity and guarantees the accuracy of these two procedures. We applied the property of "shifting symmetries" in the weight matrix, which consists in finding a minimal set of basis matrices that can exactly reconstruct the complete family of collision weight matrix. This procedure, together with showing the sparsity of the weight matrix, reduces the computation and storage of the collision matrix from O(N3) down to O(N2). (2). Spectral Gap for Linearized Boltzmann Operator. Spectral gaps provide information on the relaxation to equilibrium. This is a pioneer field currently unexplored form the computational viewpoint. This work, for the first time, provides numerical evidence on the existence of spectral gaps and corresponding approximate values. The linearized Boltzmann operator is projected onto a Discontinuous Galerkin mesh, resulting in a "collision matrix" The original spectral gap problem is then approximated by a constrained minimization problem, with objective function the Rayleigh quotient of the "collision matrix" and with constraints the conservation laws. A conservation correction then applies. We also study the convergence of the approximate Rayleigh quotient to the real spectral gap. (3). A Conservative Scheme for Approximating Collisional Plasmas. We have developed a deterministic conservative solver for the inhomogeneous Fokker-Planck-Landau equations coupled with Poisson equations. The original problem is splitted into two subproblems: collisonless Vlasov problem and collisonal homogeneous Fokker-Planck-Landau problem. They are handled with different numerical schemes. The former is approximated using Runge-Kutta Discontinuous Galerkin (RKDG) scheme with a piecewise polynomial basis subspace covering all collision invariants; while the latter is solved by a conservative spectral method. To link the two different computing grids, a special conservation routine is also developed. All the projects are implemented with hybrid MPI and OpenMP. Numerical results and applications are provided.
Download or read book Introduction to Radiological Physics and Radiation Dosimetry written by Frank Herbert Attix and published by John Wiley & Sons. This book was released on 2008-09-26 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: A straightforward presentation of the broad concepts underlying radiological physics and radiation dosimetry for the graduate-level student. Covers photon and neutron attenuation, radiation and charged particle equilibrium, interactions of photons and charged particles with matter, radiotherapy dosimetry, as well as photographic, calorimetric, chemical, and thermoluminescence dosimetry. Includes many new derivations, such as Kramers X-ray spectrum, as well as topics that have not been thoroughly analyzed in other texts, such as broad-beam attenuation and geometrics, and the reciprocity theorem. Subjects are layed out in a logical sequence, making the topics easier for students to follow. Supplemented with numerous diagrams and tables.
Download or read book Intensity Modulated Radiation Therapy written by Indra Jeet Das and published by Iph001. This book was released on 2020-12-29 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intensity modulated radiation therapy (IMRT) has become standard of care for most cancer sites that are managed by radiation therapy. This book documents the evolution of this technology over 35 years to the current level of volumetric arc modulated therapy (VMAT). It covers every aspect of this radiation treatment technology, including the fundamentals of IMRT/VMAT, basic principles and advanced processes for implementation. The physics of IMRT is followed by the clinical application in major disease sites such as central nervous system, head and neck, breast, lung, prostate and cervix. It also provides updated references on each component of IMRT/VMAT. This book is written by leading experts in the field with extensive clinical experience in the practice and implementation of this technology. Key Features Provides comprehensive coverage of IMRT for radiation therapy students, dosimetrists, physicists, medical residents and radiation professionals Includes up-to-date descriptions of current instrumentation and practises Diagrams and images are included throughout to illustrate fundamental concepts and aid understanding Provides extensive references for further reading
Download or read book An Introduction to Medical Physics written by Muhammad Maqbool and published by Springer. This book was released on 2017-11-11 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book begins with the basic terms and definitions and takes a student, step by step, through all areas of medical physics. The book covers radiation therapy, diagnostic radiology, dosimetry, radiation shielding, and nuclear medicine, all at a level suitable for undergraduates. This title not only describes the basics concepts of the field, but also emphasizes numerical and mathematical problems and examples. Students will find An Introduction to Medical Physics to be an indispensible resource in preparations for further graduate studies in the field.
Download or read book Diagnostic Radiology Physics written by International Atomic Energy Agency and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is aimed at students and teachers involved in programmes that train medical physicists for work in diagnostic radiology. It provides a comprehensive overview of the basic medical physics knowledge required in the form of a syllabus for the practice of modern diagnostic radiology. This makes it particularly useful for graduate students and residents in medical physics programmes. The material presented in the publication has been endorsed by the major international organizations and is the foundation for academic and clinical courses in both diagnostic radiology physics and in emerging areas such as imaging in radiotherapy.
Download or read book The Modern Technology of Radiation Oncology written by Jake Van Dyk and published by Medical Physics Publishing Corporation. This book was released on 1999 with total page 1106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Details technology associated with radiation oncology, emphasizing design of all equipment allied with radiation treatment. Describes procedures required to implement equipment in clinical service, covering needs assessment, purchase, acceptance, and commissioning, and explains quality assurance issues. Also addresses less common and evolving technologies. For medical physicists and radiation oncologists, as well as radiation therapists, dosimetrists, and engineering technologists. Includes bandw medical images and photos of equipment. Paper edition (unseen), $145.95. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Cybernetics Cognition and Machine Learning Applications written by Vinit Kumar Gunjan and published by Springer Nature. This book was released on 2021-03-30 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes the original, peer reviewed research articles from the 2nd International Conference on Cybernetics, Cognition and Machine Learning Applications (ICCCMLA 2020), held in August, 2020 at Goa, India. It covers the latest research trends or developments in areas of data science, artificial intelligence, neural networks, cognitive science and machine learning applications, cyber physical systems and cybernetics.
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 Spinal Cord Injury SCI Repair Strategies written by Giuseppe Perale and published by Woodhead Publishing. This book was released on 2019-10-30 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spinal Cord Injury (SCI) Repair Strategies provides researchers the latest information on potential regenerative approaches to spinal cord injury, specifically focusing on therapeutic approaches that target regeneration, including cell therapies, controlled drug delivery systems, and biomaterials. Dr. Giuseppe Perale and Dr. Filippo Rossi lead a team of authoritative authors in academia and industry in this innovative reference on the field of regenerative medicine and tissue engineering. This book presents all the information readers need to understand the current and potential array of techniques, materials, applications and their benefits for spinal cord repair. Covers current and future repair strategies for spinal cord injury repair Focuses on key research trends, clinics, biology and engineering Provides fundamentals on regenerative engineering and tissue engineering
Download or read book Melanoma written by Adam I. Riker and published by Springer. This book was released on 2018-06-06 with total page 653 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text serves as a very useful clinical guide and realistic approach to the clinical management of melanoma. Primary care physicians, specialists from varying areas of medical practice and numerous other healthcare providers will find this text to be quite useful as a standard daily reference and use in the office setting. It provides a clear and concise source of information in order to make real-life, evidence-based decisions for all aspects of management for cutaneous melanoma. This book also provides the latest breakthroughs in melanoma research, ranging from recent discoveries in genomics and epigenetics, to newly identified genes that have been selectively targeted for the development of a personalized approach to treatment. All chapters are written by specialists and true experts within their respective fields, incorporating the latest scientific, clinical and evidence-based medicine for melanoma (and non-melanoma skin cancers). This up-to-date information can be easily applied and translated to the clinical setting for the melanoma patient.
Download or read book Medical Image Computing and Computer Assisted Intervention MICCAI 2002 written by Takeyoshi Dohi and published by Springer. This book was released on 2003-06-30 with total page 855 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fifth international Conference in Medical Image Computing and Computer Assisted Intervention (MICCAI 2002) was held in Tokyo from September 25th to 28th, 2002. This was the first time that the conference was held in Asia since its foundation in 1998. The objective of the conference is to offer clinicians and scientists the opportunity to collaboratively create and explore the new medical field. Specifically, MICCAI offers a forum for the discussion of the state of art in computer-assisted interventions, medical robotics, and image processing among experts from multi-disciplinary professions, including but not limited to clinical doctors, computer scientists, and mechanical and biomedical engineers. The expectations of society are very high; the advancement of medicine will depend on computer and device technology in coming decades, as they did in the last decades. We received 321 manuscripts, of which 41 were chosen for oral presentation and 143 for poster presentation. Each paper has been included in these proceedings in eight-page full paper format, without any differentiation between oral and poster papers. Adherence to this full paper format, along with the increased number of manuscripts, surpassing all our expectations, has led us to issue two proceedings volumes for the first time in MICCAI’s history. Keeping to a single volume by assigning fewer pages to each paper was certainly an option for us considering our budget constraints. However, we decided to increase the volume to offer authors maximum opportunity to argue the state of art in their work and to initiate constructive discussions among the MICCAI audience.
Download or read book Electrophoretic Deposition of Nanomaterials written by James H. Dickerson and published by Springer Science & Business Media. This book was released on 2011-09-18 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of contemporary basic research, emerging technology, and commercial and industrial applications associated with the electrophoretic deposition of nanomaterials. This presentation of the subject includes an historical survey, the underlying theory of electrophoresis, dielectrophoresis, and the colloidal deposition of materials. This is followed by an assessment of the experimental equipment and procedures for electrophoretic and dielectrophoretic aggregation, manipulation, and deposition of nanoparticles, nanotubes, and other nanomaterials. Additional chapters explore the specific science and technology of electrophoretic film formation, using widely studied and application-driven nanomaterials, such as carbon nanotubes, luminescent nanocrystals, and nano-ceramics. The concluding chapters explore industrial applications and procedures associated with electrophoretic deposition of nanomaterials.
