I’ve spent the past few months absolutely baffled by window width and level. Your video is the first time it has clicked for me! Thank you for making this! I shall be rewatching many times for revision :)
This explanation is the best. Explaining one by one from CT brain, CT lung, CT bones, and CT soft tissue (abdomen) makes me understand so much better regarding WW and WL. Also the explanation on differences in blood appearance in CT brain and CT abdomen is also a great point to avoid confusion for new people like me when studying CT Window. Thanks a lot sir!
what the post-processing image adjustment of the final displayed image determine the range of CT numbers that occupy the full gray scale? window width or window level?
Sorry that you are still having issues. In general the window level is set based on the average CT number of the tissue you are looking at and the window width is set based on the range of values with the material and the neighboring material. So if just soft tissue the window width will be smaller and if bone or air the window width will be larger as more differences.
You are right the width of a window can’t be negative, and the level or center can be. If you draw yourself a number line from -1000 HU to 3000 HU then put a dotted line as the window level at one value. Then draw an arrow centered on the dotted line but crossing it. The length of that line is the window width. The length of a the line cannot be negative but it’s absolute position can be. Does this make sense? Draw it out and let me know
I’ve spent the past few months absolutely baffled by window width and level. Your video is the first time it has clicked for me! Thank you for making this! I shall be rewatching many times for revision :)
Great to hear! Thanks so much for leaving the comment. Pass it on to friends
This explanation is the best. Explaining one by one from CT brain, CT lung, CT bones, and CT soft tissue (abdomen) makes me understand so much better regarding WW and WL. Also the explanation on differences in blood appearance in CT brain and CT abdomen is also a great point to avoid confusion for new people like me when studying CT Window. Thanks a lot sir!
Farhan you’re welcome glad it helped
Best video in the topic!! Thank you so much
You’re welcome thanks so much for the great comment.
thanks man
Happy to help
what the post-processing image adjustment of the final displayed image determine the range of CT numbers that occupy the full gray scale? window width or window level?
The image width is the range of values
cheers for the good video
Cheers to a good comment :)
The window width and widow level settings confuse me more than anything else in CT. I just struggle to understand knowing the setting ranges.
Sorry that you are still having issues. In general the window level is set based on the average CT number of the tissue you are looking at and the window width is set based on the range of values with the material and the neighboring material. So if just soft tissue the window width will be smaller and if bone or air the window width will be larger as more differences.
@@HowRadiologyWorks ok that makes more sense. Thankfully, I passed the registry a couple days ago. Your videos were very helpful
window width is always a positive number whereas window level can be either positive or negative,
Am I right?
You are right the width of a window can’t be negative, and the level or center can be. If you draw yourself a number line from -1000 HU to 3000 HU then put a dotted line as the window level at one value. Then draw an arrow centered on the dotted line but crossing it. The length of that line is the window width. The length of a the line cannot be negative but it’s absolute position can be. Does this make sense? Draw it out and let me know