"Upper and lower grey level calculation "
"soft tissues: W:350–400 L:20–60 4"
"soft tissues: W:350–400 L:20–60 4"
"When presented with a WW and WL one can calculate the upper and lower grey levels i.e. values over x will be white and values below y will be black."
Expected headings
"Window parameters"
"Window width"
"Wide window"
"Narrow window"
"Window level/centre"
"Upper and lower grey level calculation "
"Typical window width and level values"
"Windowing, also known as grey-level mapping, contrast stretching, histogram modification or contrast enhancement is the process in which the CT image greyscale component of an image is manipulated via the CT numbers; doing this will change the appearance of the picture to highlight particular structures. The brightness of the image is adjusted via the window level. The contrast is adjusted via the window width."