Journal of Medical Physics

Year
: 1999  |  Volume : 24  |  Issue : 2  |  Page : 65--68

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


Pratik Kumar1, R C Yadav2, M M Rehani3 
1 
2 
3 

Correspondence Address:
Pratik Kumar


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%.


How to cite this article:
Kumar P, Yadav R, Rehani M. Quality Assurance Tests Of View-Boxes By A Home-Made Light Meter.J Med Phys 1999;24:65-68


How to cite this URL:
Kumar P, Yadav R, Rehani M. Quality Assurance Tests Of View-Boxes By A Home-Made Light Meter. J Med Phys [serial online] 1999 [cited 2021 Dec 4 ];24:65-68
Available from: https://www.jmp.org.in/article.asp?issn=0971-6203;year=1999;volume=24;issue=2;spage=65;epage=68;aulast=Kumar;type=0