Information about JPEG-LS is easily found on Google and in a lot of DICOM chapters. However, there are links/pages/readings that mention JPEG-LL, too. However, i have taken a deeper look at the DICOM standard, not a chapter has ever mentioned anything about JPEG-LL, but in a lot of other conformance statements/forums/articles, JPEG-LL has been mentioned...
So, what is the difference between JPEG-LS and JPEG-LL?
I supposed JPEG-LL refers to ITU-T T.81, ISO/IEC IS 10918-1 aka JPEG lossless. While JPEG-LS refers to ITU-T T.87, ISO/IEC IS 14495-1.
Technically speaking JPEG-LL is exactly the same standard as the usual 8bits lossy jpeg as found on internet website. JPEG-LS is much much less common.