[Bug] WindowLevel resets when direction changes (discussed in OHIF Office Hours meeting)

[julianlinaress]

Describe the Bug

So more than once I've come across series in which direction of the image changes between slices, which maybe is not supposed to happen (video for example). Looking at the source code in StackViewport.ts I see that _updateActorToDisplayImageId(image) is used to

"check if we can reuse the vtkImageData that is in place ... If we cannot reuse it, create a new actor, remove the old one, and reset the camera"

And one of the data atributes used to compare is direction, which of course changes in this case for many slices, and ends up resetting the WindowLevel values. I assume this is the desired behaviour but what would be a good way to go around it? Maybe some sort of viewport configuration?

anonymized_mr.zip
Note: Serie "Axial t1_qtse" changes direction between slices The other one is for reference

Recording.2025-02-06.143038.-.Trim.mp4

Steps to Reproduce

1. Change window/level
2. Stack scroll

The current behavior

Window level resets when direction changes

The expected behavior

Be able to avoid window/level reset

OS

Windows 11

Node version

v22.11.0

Browser

Chrome 133.0.6943.53

[sedghi]

This is fixed now, try again

[julianlinaress]

Fixed indeed, thank you!