[Nirfast] Extinction parameters

[Stanislaw Wojtkiewicz]

Hi Emmanuel

 

Lipids I believe. It’s all in the file.

As in the excoef.txt file:

 

HbO

deoxyHb

Water

Lipids

LuTex

GdTex

   6.0000000e+02   7.3696000e-01   3.3801592e+00   2.3000000e-04
4.6600000e-04   NaN   NaN

   6.0100000e+02   6.7523960e-01   3.2586989e+00   2.3400000e-04
4.7100000e-04   NaN   NaN

 

 

You don’t need all columns of the excoef.txt. See ‘load_mesh.m’ on how
excoef.txt file is handled.

A hint:

The excoef.txt file saves any and any number of spectra. I.e. you can
use/define your own spectra!

Not all spectra from the ‘excoef.txt’  are used. The ‘*.param’ file is used
to set spectra in use. E.g. ‘cylinder_spec.param’ sets only haemoglobins and
water:

spec

HbO

deoxyHb

Water

S-Amplitude

S-Power

0.01 0.01 0.4 1 1 

0.01 0.01 0.4 1 1 

0.01 0.01 0.4 1 1 

 

 

S.

 

Regards

Stanislaw Wojtkiewicz, PhD

 

---

School of Computer Science

University of Birmingham

B15 2TT

 

From: emmanuel.cosnard at outlook.fr <emmanuel.cosnard at outlook.fr> 
Sent: 19 March 2019 12:00
To: nirfast at public.kitware.com; s.wojtkiewicz at cs.bham.ac.uk
Subject: RE: [Nirfast] Extinction parameters

 

Hi Stanislas, 

 

Thank you very much for your answer. There is still a fourth column for each
line of the .excoef file, and I don't understand to what it corresponds. Do
you know what is the last column about, and how I can fill it?

 

Thank you,

 

Emmanuel

  _____  

De : Stanislaw Wojtkiewicz < <mailto:s.wojtkiewicz at cs.bham.ac.uk>
s.wojtkiewicz at cs.bham.ac.uk>
Envoyé : mardi 19 mars 2019 11:13
À :  <mailto:emmanuel.cosnard at outlook.fr> emmanuel.cosnard at outlook.fr;
<mailto:nirfast at public.kitware.com> nirfast at public.kitware.com
Objet : RE: [Nirfast] Extinction parameters 

 

Hi Emmanuel

 

NIRFAST values are expressed in ln(10)*mm^-1mM^-1 (mM - milli molar (molar -
moles/liter)) for haemoglobins and in mm^-1 for water.

Compare with  <https://omlc.org/spectra/hemoglobin/summary.html>
https://omlc.org/spectra/hemoglobin/summary.html

It’s the same. Also, this website gives you all information needed.

 

Cheers,

S.

 

 

Regards

Stanislaw Wojtkiewicz, PhD

 

---

School of Computer Science

University of Birmingham

B15 2TT

 

From:  <mailto:emmanuel.cosnard at outlook.fr> emmanuel.cosnard at outlook.fr <
<mailto:emmanuel.cosnard at outlook.fr> emmanuel.cosnard at outlook.fr> 
Sent: 19 March 2019 10:41
To:  <mailto:nirfast at public.kitware.com> nirfast at public.kitware.com
Subject: [Nirfast] Extinction parameters

 

Hello,

 

I would like to know how exactly do we compute the extinction parameters for
each wavelength, that are stored in the excoef file? 

 

Thank you and regards,

 

Emmanuel

 

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