tailieunhanh - IMAGING OF THE BREAST – TECHNICAL ASPECTS AND CLINICAL IMPLICATION

Arterial CO2 tension is a powerful modulator of cerebral vascular calibre, CBF and ICP (12-15.) While the mechanisms are incompletely understood, CO2 relaxes pial arterioles by interactions between the endothelium, vascular smooth muscle, pericytes, adjacent neurons and glial cells. Studies supported that cerebral vessels are sensitive to changes in extracellular pH, rather than a direct response to CO2 or bicarbonate. In the limits of physiological PaCO2, 20-60 mmHg, the relationship between PaCO2 and CBF is linear. Therefore, increased PaCO2 results in vasodilation of cerebral vessels and this leads to increase CBF, increase CBV, decrease intracranial compliance and increase ICP. The reverse mechanism is also true for low CO2. | IMAGING OF THE BREAST -TECHNICAL ASPECTS AND CLINICAL IMPLICATION Edited by Laszlo Tabar Imaging of the Breast - Technical Aspects and Clinical Implication Edited by Laszlo Tabar Published by InTech Janeza Trdine 9 51000 Rijeka Croatia Copyright 2012 InTech All chapters are Open Access distributed under the Creative Commons Attribution license which allows users to download copy and build upon published articles even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. After this work has been published by InTech authors have the right to republish it in whole or part in any publication of which they are the author and to make other personal use of the work. Any republication referencing or personal use of the work must explicitly identify the original source. As for readers this license allows users to download copy and build upon published chapters even for commercial purposes as long as the author and publisher are properly credited which ensures maximum dissemination and a wider impact of our publications. Notice Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published chapters. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials instructions methods or ideas contained in the book. Publishing Process Manager Bojan Rafaj Technical Editor Teodora Smiljanic Cover Designer InTech Design Team First published March 2012 Printed in Croatia A free online edition of this book is available at Additional hard copies can be obtained from orders@ Imaging of the Breast - Technical Aspects and Clinical Implication Edited by Laszlo Tabar p. cm. ISBN 978-953-51-0284-7 INTECH