Thanks for your kind reply,
The window center and window width are correct in k-pacs and they are the same as in any other dicom viewer
but the screen shows wrong display in k-pacs and it's different from any other dicom viewer.
what other attribute can affect the screen display in k-pacs?
N.B. I notice that the adjustment of contrast is working in reverse order for that study.
for other study when window center grows up the image become more dark
but for this study when window center grows up the image becomes more white.
Thanks for your help