[Nirfast] Inversed Values for Jacobian Matrix

[Hamid Dehghani]

Dear Zeph
Are you using a spectral mesh?
If so, then the Jacobian is in fact Log amplitude/ua and not
Log amplitude change/log ua
If you are using a single wavelength mesh (standard) than when you use 
the Jacobian function, it gives you two values for J
J.complex = is the amplitude/mua or kappa
J.complete = is the log amplitude/mua or kappa
The plot you show, appears correct to me.
Hamid

On 13/04/2018 04:01, zeph.phillips at gmail.com wrote:
> When I try to construct the Jacobian matrix for continuous wave DOT, I 
> find that my values are inversed than what I expect, according to 
> literature and other figures (if we assume that the each value is the 
> log amplitude change/log ua changes). Thus to get the correct DOT image, 
> I have to multiply these values by a negative one value.
> 
> Has anyone run into this issue? Perhaps I am constructing the Jacobian 
> matrix inappropriately or interpreting it wrong?
> 
> Jacobian Construction:
> J = jacobian(mesh,0,850);
> 
> Optical Properties:
> val.mua=0.018;
> val.mus=0.69;
> val.ri=1.3;
> 
> 
> 
> 
> -- 
> ______________________
> Kind Regards,
> *Zeph Phillips*
> /zeph.phillips at gmail.com/ <mailto:zeph.phillips at gmail.com>
> 
> 
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-- 
--------------------------
Hamid Dehghani, PhD, MIPEM
Professor of Medical Imaging
School of Computer Science
Co-Director, Physical Sciences for Health Doctoral Training Centre
University of Birmingham
B15 2TT
0121 414 8728
https://www.cs.bham.ac.uk/~dehghanh/mi-lab.html