Journal of Medical Physics
 Home | Search | Ahead of print | Current Issue | Archives | Instructions | Subscription | Login  The official journal of AMPI, IOMP and AFOMP      
 Users online: 739  Home  EMail this page Print this page Decrease font size Default font size Increase font size 
Year : 1999  |  Volume : 24  |  Issue : 2  |  Page : 65-68

Quality Assurance Tests Of View-Boxes By A Home-Made Light Meter

Correspondence Address:
Pratik Kumar

Login to access the Email id

Source of Support: None, Conflict of Interest: None

Rights and PermissionsRights and Permissions

View-box is the last and important but often neglected link in the imaging Process. The quality assurance programme for view-boxes includes the measurement of the intensity of light-output (luminance) in Candella/m2 and the extent of variation in luminance (inhomogeneity) over the front surface of the view-box. An expensive instrument, photometer, is required to conduct both of these tests. Instead, an inexpensive Light Dependent Resistor (LDR) in combination with Ohm-meter may be used. The importance of quality assurance checks is indicated by the fact that majority of view-boxes (37.5%, 36 out of 49) had luminance less than 800 cd/m2, while the recommended level is about 1000 cd/m2 or more. Again, 55% view-boxes (27 out of 49) were found with inhomogeneity in luminance more than 10% while the permissible limit is up to 10%.

Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)

 Article Access Statistics
    PDF Downloaded178    
    Comments [Add]    

Recommend this journal