TECHNICAL ISO/TR REPORT 21900 First edition 2018-09 Guidance for uncertainty analysis regarding the application of ISO/TS 10974 Lignes directrices pour I'analyse de I'incertitude concernant I'application de I'IS0/TS 10974 Reference number ISO/TR 21900:2018(E) [so International Organization for Standardization Shenzhen Institute of Standards and Technology 9972181 @IS02018 Not for Resale, 2018/12/5 07:24:56 IS0/TR21900:2018(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP401·Ch.deBlandonnet8 CH-1214 Vernier, Geneva Phone:+4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ganizationfor Standardization icensee-Shenzhen Institute o Standards andecISog?i- All rights reserved rious National Standards Bodies IS0/TR 21900:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions ..1 4 Uncertainty background .1 4.1 General ..1 4.2 Method 1 Evaluation .2 4.3 Method 2 Evaluation .3 5 Experiment Uncertainty (uexp) .3 5.1 General .3 5.2 Measurement tool uncertainty (probe) .3 5.3 Probe position uncertainty. .3 5.4 Tissue simulating phantom. 4 5.5 RFfield source. .4 5.6 Phantom position uncertainty 4 5.7 AIMD influence .4 5.8 Overall uexp consideration .4 6 AIMD model uncertainty (uPredict) .5 6.1 Piecewise excitation method for deriving AIMD model ..5 6.2 AIMD model uncertainty (uPredict): Method 1 6.3 AIMD model uncertainty (uPredict): Method 2 ..11 7 Clinical uncertainty (uclinical) .12 8 Uncertainty in conversion to power (upower) ..13 9 Final uncertainty (combination and application) ..13 Bibliography .14 iii =Shenzhen Institute of Standards and Technology 9972181