Otsu segmentation on Head and Neck PET image

Operating system: Windows 11 home
Slicer version:Slicer 4.13.0-2021-12-22
Is it advisable to use otsu method to segment tumour (marked in blue) on PET images? If it is possible, please guide me to the relevant resources (a tutorial preferably) on how to apply the otsu method to this image. I tried otsu method, but not sure whether I did it right.

If there are any other methods that would work on this image please suggest that too pointing to relevant documents.

Thanks in advance.

Otsu threshold is not typically used for this. 40-43% of maximum SUV value is used instead. There have been a few discussions about this, for example: