Need help wit vessel analysis

Hi, I'm new to using ImageJ, and I was wondering if anyone has any suggestions for how I can get the vascular density from the attached image. I've tried a few programs, including Vessel Analysis, one made for a specific paper, and AngioTool (which didn't work due to Java issues). Any advice would be greatly appreciated. I also specifically want to calculate the density under the glass circular coverslip on the image.

https://preview.redd.it/t72kvmet9aoh1.jpg?width=3072&format=pjpg&auto=webp&s=bea6430d6b1229e1b9c79e2e303ea4d7010e7662