[Homer-users] about extinction coefficients?

[Ted Huppert]

The extinction coefficients used in Homer are from:

W. B. Gratzer, Med. Res. Council Labs, Holly Hill, London
N. Kollias, Wellman Laboratories, Harvard Medical School, Boston

and are listed on the Oregon Medical Laser Center's Website:

http://omlc.ogi.edu/spectra/hemoglobin/summary.html


... clearly there are some subtle variations on this spectrum and I will 
impliment David Boas's idea of allowing users to choice which spectrum 
(reference to use)...  I'll probably put in some way to plot the spectrum 
as well.  Look for that in the next release in a few months.  Currently, 
its the values listed in the website above.



By default the Partial Pathlength correction is NOT included.  However, on 
the Filtering>> Advanced Options field, there are two edit fields for the 
pathlength and partial volume correction.  The  checkboxes next to those 
fields must be checked to include these corrections.  This allows the 
users to specify which PPF to use.  These are the corrections for the 
first and second wavelength respectively  (...and possibly more if you 
have such a system).


-Ted











On Tue, 23 Nov 2004, Chunshui Zhao wrote:

> Dear sir£¬
>
> What are the values of extinction coefficients and differential path length factors at wavelengths 690 and 830, as used in Homer?