Physics of Thermal Therapy

Physics of Thermal Therapy
Author: Eduardo Moros
Publisher: Taylor & Francis
Total Pages: 375
Release: 2016-04-19
Genre: Medical
ISBN: 1439848920

The field of thermal therapy has been growing tenaciously in the last few decades. The application of heat to living tissues, from mild hyperthermia to high-temperature thermal ablation, has produced a host of well-documented genetic, cellular, and physiological responses that are being researched intensely for medical applications, particularly fo

Adaptive Phased Array Thermotherapy for Cancer

Adaptive Phased Array Thermotherapy for Cancer
Author: Alan Jeffrey Fenn
Publisher: Artech House
Total Pages: 241
Release: 2009
Genre: Medical
ISBN: 1596933801

From electromagnetic field theory for tissue heating... to simulations of adaptive phased array thermotherapy for deep tumors of the torso... to coverage of arrays for tumors in the head, neck, breast, and chest wall, this timely resource offers you expert guidance in this emerging area.

Deep Localized Hyperthermia with Ultrasound Phased Arrays Using the Pseudoinverse Pattern Synthesis Method

Deep Localized Hyperthermia with Ultrasound Phased Arrays Using the Pseudoinverse Pattern Synthesis Method
Author: Emad S. A. Ebbini
Publisher:
Total Pages: 330
Release: 1990
Genre:
ISBN:

One of the major limitations of hyperthermia as a cancer treatment modality is the lack of heating equipment and techniques capable of consistent therapeutic heating of deep-seated tumors. This thesis introduces a new pattern synthesis method capable of precisely controlling the power deposition level at a set of control points in the treatment volume using ultrasound phased arrays. This method, called the pseudoinverse pattern synthesis method, reduces the pattern synthesis problem to one of estimating the minimum-norm least-square solution to a matrix equation of the form, Hu = p, where u is the array excitation vector, p is the desired complex pressure at the control points, and H is a matrix propagation operator from the surface of the array to the control points. A useful solution to this problem is obtained when the number of control points is less than the number of elements of the array and the matrix H is full rank. This solution, called the minimum-norm solution, allows the array to be focused at several points simultaneously. This multiple-focus approach is important when ultrasound is used as a heating agent as it reduces the spatial-peak temporal-peak intensity required to generate a specified heating pattern. Furthermore, the minimum-norm solution allows the optimization of the array excitation efficiency and the intensity gain at the control points. These quantities are very significant for achieving deep localized heating with phased arrays. In fact, optimization of the intensity gain at the control points generally results in removal of high intensity interference patterns from the synthesized field. The removal of high intensity interference patterns eliminates one of the major disadvantages of multiple focusing. The pseudoinverse pattern synthesis method is introduced and discussed in detail. Simulation results are used to demonstrate its powerful capabilities as a pattern synthesis method. Its generality is demonstrated by the use of several different array structures to synthesize different multiple-focus patterns. Simulation results indicate that direct synthesis of multiple-focus patterns can provide an alternative to single-focus scanning. Finally, measured intensity profiles using a prototype cylindrical-section array agree well with theoretically predicted profiles.

Image-guided Focused Ultrasound Therapy

Image-guided Focused Ultrasound Therapy
Author: Feng Wu
Publisher: CRC Press
Total Pages: 503
Release: 2024-07-31
Genre: Medical
ISBN: 1498711367

Ultrasound has been widely used in diagnostic imaging for a long time. In the past 10 years, image-guided focused ultrasound therapy has seen rapid growth, in biomedical science and engineering, and in clinical medicine. The purpose of this book is to bring internationally renowned authorities and experts in this field together to provide up-to-date and comprehensive reviews of basic physics, biomedical engineering, and clinical applications of focused ultrasound therapy in a widely accessible fashion. Focusing on applications in cancer treatment, this book covers basic principles, practical aspects, and clinical applications of focused ultrasound therapy. It reviews the medical physics and bio-effects of focused ultrasound beams on living tissues, dosimetric methods and measurements, transducer engineering, image guidance and monitoring (including magnetic resonance imaging -- MRI -- and ultrasound), treatment delivery systems, and clinical applications. The book also gives practical guidelines on patient setup, target localisation, treatment planning and image-guided procedures for the treatment in various sites, including the prostate, liver, pancreas, breast, kidney, uterus, bone, and brain. The book discusses major challenges for the use of focused ultrasound energy on living tissues and explores the cellular and physiological responses that can be employed in the fight against cancer from biological, physics and engineering perspectives. It also highlights recent advances, including the treatment of solid tumours using image-guided drug delivery, and the exploitation of microbubbles, nanoparticles, and other cutting-edge techniques. Readers who are interested in learning more about the technique and the clinical applications described in each chapter can find more information in the comprehensive bibliographies provided. This book is suitable for anyone involved in, or looking to become involved in, the research and clinical applications of focused ultrasound therapy, including medical professionals, physicists, biomedical engineers, graduate students and others working in this multidisciplinary field. It offers a balanced and critical assessment of state-of-the-art technologies, major challenges, and an outlook on the future of focused ultrasound therapy. It presents a thorough introduction for those new to the field while providing helpful, up-to-date information and guidelines for readers already using this therapy in clinical and pre-clinical settings. Key Features: Brings together a wide range of world-leading experts in this new field, presenting the latest clinical outcomes of using focused ultrasound for the treatment of benign and malignant diseases Covers the fundamental physics of focused ultrasound therapy and ultrasound-mediated drug delivery, including chapters on the mechanism of sonoporation, microbubble and ultrasound interaction, and their potential clinical applications Introduces clinical guidelines for focused ultrasound therapy, including indications and contraindications, treatment goals, the selection of patients, clinical observation during treatment procedure and follow-up, and characteristics of image changes after treatment