Spectral Panel - Intralipid Phantom MuA inaccurate

[ccampb19]

Since water makes up the majority of the intralipid absorption spectrum, I would expect to see a water peak at 970nm. Also, I believe the peak at 700nm is spurious. At least, I don't see this peak in my nigrosin spectra or the lipid spectrum we use, or in my Intralipid measurements. Perhaps it's related to the water problem.

[dcuccia]

Interesting, thanks Chris. What does it look like if you back down nigrosin to near zero, e.g. 0.0001?

[ccampb19]

Hey David. It's the same curve, scaled.

[dcuccia]

Thanks. Looks like water is not in there at all. With an IL vol fraction of 0.01, the water fraction should be 0.99, resulting in an absorption of about 0.05/mm at roughly 970nm.

[ccampb19]

Right, and the water spectrum works in a custom tissue -- but then there's no nigrosin available to add.