ISO INTERNATIONAL STANDARD 18939 First edition 2013-11-01 Imaging materials - Digital hard copy for medical imaging Methods of measuring permanence Matériaux pour I'image-Photocopie numerique pour imagerie médicale - Méthodes de mesure de la permanence Reference number ISO 18939:2013(E) LSO @IS02013 IHS under ted without license from IHS Not for Resale IS0 18939:2013(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2013 All righits reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved Not for Resale IS0 18939:2013(E) Contents Page Foreword .iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions 1 4 Physical test methods 4 4.1 General 4 4.2 Layer adhesion .4 4.3 Binder stability test. .6 4.4 Blocking test and image interaction test 5 Test methods for image stability .9 5.1 General. 5.2 Thermal-ageing test (dark stability) .9 5.3 Light chamber test .13 5.4 Image spread test. .16 Annex A (informative) Light stability test conversion of units .19 Annex B (informative) Effect of residual compounds on thermally processed radiographic images. .20 Annex C (informative) Simulated thermal ageing tests .21 Annex D (informative) Greyscale evaluation based on just noticeable differences (JNDs) defined DICOM standard display function (SDF) .22 Annex E (informative) CiE colour space parameters for evaluation of discolouration ..26 Bibliography .27 iii se with I ut license from IHS Not for Resale