Tissue and Vascular Oxygenation Dynamics Determined by Optical Approaches and MRI
Tissue and Vascular Oxygenation Dynamics Determined by Optical Approaches and MRI

Author: Mengna Xia

Publisher: ProQuest

Published: 2007

Total Pages:

ISBN-13: 9780549145059

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Tumor oxygenation is a crucial factor to determine the efficiency of non-surgery therapy, such as radiotherapy and chemotherapy. Therefore, various approaches have been applied to tumor in order to improve the tumor oxygen level. Breathing oxygen-rich gas with normobaric or hyperbaric pressure has been demonstrated to overcome hypoxia, but with marginal success. Therefore, the outcome would be improved greatly, if the responsive tumors were identified in priori. Two non-invasive techniques were applied to monitor tumor oxygenation dynamics simultaneously when rats were exposed to hyperoxic gas intervention. 19F MRI provides tumor tissue oxygen tension (pO2) images, while Near Infrared Spectroscopy (NIRS) measures global tumor vascular dynamics. Multiple correlations were examined between the rate and magnitudes of vascular and tissue oxygen responses. In order to extract more physiological information from tumor vascular oxygen measured by NIRS, a mathematical model, modified from the Windkessel model, was used to obtain the tumor blood flow and oxygen consumption rate from hemoglobin concentration. Besides normobaric oxygen intervention, hyperbaric oxygen intervention was also adopted to improve tumor oxygenation because it increases oxygen tension and oxygen delivery to tissue independent of hemoglobin. Two techniques, FOXY(TM) fluorescence quenching oxygen sensor and NIRS, were applied simultaneously to monitor tumor tissue and vascular oxygen during and post hyperbaric oxygen administration, so as to investigate tumor oxygenation achieved with hyperbaric oxygen and the preservation of tumor oxygenation after hyperbaric oxygen intervention. I applied combined administration of doxorubicin and hyperbaric oxygen to tumors and compared the tumor oxygenation dynamics, tumor size, body weight between rats with combined therapy and those with doxorubicin alone. Combined application of MRI and NIRS, and FOXY(TM) oxygen sensor are novel methodology, which are complementary. Simultaneous application gives us a better understanding on the patho-physiology of tumor and response to therapeutic intervention.

High Resolution Imaging in Microscopy and Ophthalmology
High Resolution Imaging in Microscopy and Ophthalmology

Author: Josef F. Bille

Publisher: Springer

Published: 2019-08-13

Total Pages: 411

ISBN-13: 3030166384

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This open access book provides a comprehensive overview of the application of the newest laser and microscope/ophthalmoscope technology in the field of high resolution imaging in microscopy and ophthalmology. Starting by describing High-Resolution 3D Light Microscopy with STED and RESOLFT, the book goes on to cover retinal and anterior segment imaging and image-guided treatment and also discusses the development of adaptive optics in vision science and ophthalmology. Using an interdisciplinary approach, the reader will learn about the latest developments and most up to date technology in the field and how these translate to a medical setting. High Resolution Imaging in Microscopy and Ophthalmology – New Frontiers in Biomedical Optics has been written by leading experts in the field and offers insights on engineering, biology, and medicine, thus being a valuable addition for scientists, engineers, and clinicians with technical and medical interest who would like to understand the equipment, the applications and the medical/biological background. Lastly, this book is dedicated to the memory of Dr. Gerhard Zinser, co-founder of Heidelberg Engineering GmbH, a scientist, a husband, a brother, a colleague, and a friend.

In Vivo Optical Imaging of Brain Function, Second Edition
In Vivo Optical Imaging of Brain Function, Second Edition

Author: Ron D. Frostig

Publisher: CRC Press

Published: 2009-05-06

Total Pages: 0

ISBN-13: 9781420076844

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These are exciting times for the field of optical imaging of brain function. Rapid developments in theory and technology continue to considerably advance understanding of brain function. Reflecting changes in the field during the past five years, the second edition of In Vivo Optical Imaging of Brain Function describes state-of-the-art techniques and their applications for the growing field of functional imaging in the live brain using optical imaging techniques. New in the Second Edition: Voltage-sensitive dyes imaging in awake behaving animals Imaging based on genetically encoded probes Imaging of mitochondrial auto-fluorescence as a tool for cortical mapping Using pH-sensitive dyes for functional mapping Modulated imaging Calcium imaging of neuronal activity using 2-photon microscopy Fourier approach to optical imaging Fully updated chapters from the first edition Leading Authorities Explore the Latest Techniques Updated to reflect continuous development in this emerging research area, this new edition, as with the original, reaches across disciplines to review a variety of non-invasive optical techniques used to study activity in the living brain. Leading authorities from such diverse areas as biophysics, neuroscience, and cognitive science present a host of perspectives that range from a single neuron to large assemblies of millions of neurons, captured at various temporal and spatial resolutions. Introducing techniques that were not available just a few years ago, the authors describe the theory, setup, analytical methods, and examples that highlight the advantages of each particular method.

Measuring Oxidants and Oxidative Stress in Biological Systems
Measuring Oxidants and Oxidative Stress in Biological Systems

Author: Lawrence J. Berliner

Publisher: Springer Nature

Published: 2020-08-08

Total Pages: 237

ISBN-13: 303047318X

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This book describes the methods of analysis and determination of oxidants and oxidative stress in biological systems. Reviews and protocols on select methods of analysis of ROS, RNS, oxygen, redox status, and oxidative stress in biological systems are described in detail. It is an essential resource for both novices and experts in the field of oxidant and oxidative stress biology.

Oxygen Transport to Tissue XXVIII
Oxygen Transport to Tissue XXVIII

Author: David Maguire

Publisher: Springer Science & Business Media

Published: 2007-08-11

Total Pages: 217

ISBN-13: 0387717641

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This multidisciplinary book covers all aspects of oxygen delivery to tissue, including blood flow and its regulation as well as oxygen metabolism as discussed at the 33rd Annual Meeting of the International Society on Oxygen Transport to Tissue (ISOTT) held in Australia in 2005. Special attention is paid to methods of oxygen measurement in living tissue and the application of these technologies to understanding the physiological and biochemical basis for pathology related to tissue oxygenation.

NMR and MRI of Gels
NMR and MRI of Gels

Author: Yves De Deene

Publisher: Royal Society of Chemistry

Published: 2020-07-07

Total Pages: 426

ISBN-13: 1788019202

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Gels are used in a large variety of commercial and scientific products from drug delivery systems and food science to biomedical sensors. They also are invaluable in MRI physics research where they mimic biological tissue and in radiotherapy quality assurance where they are used to capture the three dimensional radiation dose distribution. This unique book discusses the state-of-the-art of NMR and MRI techniques in studying the physics and chemistry of gel systems, in their application as MRI phantoms and as three dimensional radiation dosimeters. The first part of the book will cover the fundamental physical concepts of gels and the NMR techniques to study gel systems. The second part is dedicated to the application of gels in the life sciences and in the medical practice to validate radiotherapy and new MRI techniques. Filling the gap in literature, this volume provides the scientific reader with an extensive overview of possible techniques and methods to study the interesting properties and applications of gels. For the MRI researcher and medical physicist, the book will be a valuable resource in using gel phantoms for validating contemporary MRI techniques and radiotherapy treatments.

Regulation of Tissue Oxygenation, Second Edition
Regulation of Tissue Oxygenation, Second Edition

Author: Roland N. Pittman

Publisher: Biota Publishing

Published: 2016-08-18

Total Pages: 117

ISBN-13: 1615047212

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This presentation describes various aspects of the regulation of tissue oxygenation, including the roles of the circulatory system, respiratory system, and blood, the carrier of oxygen within these components of the cardiorespiratory system. The respiratory system takes oxygen from the atmosphere and transports it by diffusion from the air in the alveoli to the blood flowing through the pulmonary capillaries. The cardiovascular system then moves the oxygenated blood from the heart to the microcirculation of the various organs by convection, where oxygen is released from hemoglobin in the red blood cells and moves to the parenchymal cells of each tissue by diffusion. Oxygen that has diffused into cells is then utilized in the mitochondria to produce adenosine triphosphate (ATP), the energy currency of all cells. The mitochondria are able to produce ATP until the oxygen tension or PO2 on the cell surface falls to a critical level of about 4–5 mm Hg. Thus, in order to meet the energetic needs of cells, it is important to maintain a continuous supply of oxygen to the mitochondria at or above the critical PO2 . In order to accomplish this desired outcome, the cardiorespiratory system, including the blood, must be capable of regulation to ensure survival of all tissues under a wide range of circumstances. The purpose of this presentation is to provide basic information about the operation and regulation of the cardiovascular and respiratory systems, as well as the properties of the blood and parenchymal cells, so that a fundamental understanding of the regulation of tissue oxygenation is achieved.

Functional MRI
Functional MRI

Author: Ramachandran Ramani

Publisher: Oxford University Press

Published: 2019-01-23

Total Pages: 265

ISBN-13: 019029776X

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Functional MRI: Basic Principles and Emerging Clinical Applications provides an overview of the basic principles of fMRI for clinicians with minimal knowledge of the imaging technique and its research potential and clinical applications. The text is divided into two parts, with Section I covering the primary signal measured in fMRI (BOLD), the correlation between neuronal activity and the BOLD signal, and how the data is analyzed and interpreted in fMRI. Section II explores applications of fMRI in cognitive neuroscience and common psychiatric disorders, surgical planning in neurosurgery, anesthesia and the intensive care unit, and more. Timely and highly accessible, this book is a valuable resource for researchers and clinicians interested in understanding what fMRI is, how it works, and its applications.