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IEC_TR_62799-2013.pdf

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1、 IEC/TR 62799 Edition 1.0 2013-09 TECHNICAL REPORT Models for evaluation of thermal hazard in medical diagnostic ultrasonic fields IEC/TR 62799:2013(E)Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or di

2、stribution is permitted.Uncontrolled when printed.THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including phot

3、ocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local

4、 IEC member National Committee for further information.IEC Central Office Tel.:+41 22 919 02 11 3,rue de Varemb Fax:+41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares an

5、d publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been publishe

6、d.Useful links:IEC publications search-www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,replaced and withdrawn publications.IEC Just Published-webstore.iec.ch/justp

7、ublished Stay up to date on all new IEC publications.Just Published details all new publications released.Available on-line and also once a month by email.Electropedia-www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and d

8、efinitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary(IEV)on-line.Customer Service Centre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance,please contact the Cu

9、stomer Service Centre:csciec.ch.Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.IEC/TR 62799 Edition 1.0 2013-09 TECHNICAL REPORT Models for evaluati

10、on of thermal hazard in medical diagnostic ultrasonic fields INTERNATIONAL ELECTROTECHNICAL COMMISSION X ICS 11.040.50 PRICE CODE ISBN 978-2-8322-1099-4 Registered trademark of the International Electrotechnical Commission Warning!Make sure that you obtained this publication from an authorized distr

11、ibutor.Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.2 TR 62799 IEC:2013(E)CONTENTS FOREWORD.4 1 Scope.6 2 Normative references.6 3 Terms and defin

12、itions.6 4 Background.10 4.1 General.10 4.2 Limitations of the existing standard.11 4.2.1 Linear display.11 4.2.2 Equilibrium temperature.12 4.2.3 Tissue parameters.12 4.2.4 Transducer self-heating.12 4.2.5 Safety limits.12 5 Options for improvement of the existing standard.13 5.1 General.13 5.2 Exp

13、onential display of the current TI.13 5.2.1 Theory.13 5.2.2 Illustrative results for the new thermal index display.15 5.2.3 Advantages of the new display.15 5.2.4 Shortcomings of the new display.16 5.3 Replacement of the TI with the thermally equivalent time index(TETI).16 5.3.1 Theory.16 5.3.2 Illu

14、strative results for the TETI.20 5.3.3 Advantages of the TETI.22 5.3.4 Shortcomings of the TETI.22 5.4 Replacement of the TI with the time to threshold(TT).23 5.4.1 Theory.23 5.4.2 Illustrative results for the TT.24 5.4.3 Advantages of the TT.27 5.4.4 Shortcomings of the TT.27 5.5 Replacement of the

15、 TI with the safe use time(SUT).28 5.5.1 Theory.28 5.5.2 Illustrative results for the SUT.30 5.5.3 Advantages of the SUT.33 5.5.4 Shortcomings of the SUT.33 5.6 Replacement of the TI with the thermally equivalent time displayed(TETD).34 5.6.1 Theory.34 5.6.2 Illustrative results for the TETD.35 5.6.

16、3 Advantages of the TETD.38 5.6.4 Shortcomings of the TETD.39 6 Summary.40 7 Recommendations.41 7.1 General.41 7.2 Thermally equivalent time index.41 7.3 Other models.41 Bibliography.42 Copyrighted material licensed to BR Demo by Thomson Reuters(Scientific),Inc.,downloaded on Nov-27-2014 by James Madison.No further reproduction or distribution is permitted.Uncontrolled when printed.TR 62799 IEC:2013(E)3 Figure 1 Comparison of the values of thermal index that would be displayed under the prop

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