8 bit raw will only open as 16 bit or higher

I am attempting to open a binary 8 bit .raw CT scan with ImageJ (used both open and import). I know I have the correct height width and number of images. There is no header in the file. When I open it as an 8 bit file it shows up as all black. When I open as 16 bit it gives me four of the image. How can I get it to open it correctly as an 8 bit?