[Homer-users] Data acquisition via Homer2

[Arthur DiMartino]

Thank you. I will direct your email to the support engineers at TechEn.

 

Best

Buzz DiMartino

President

TechEn, Inc.

 

 

From: homer-users-bounces at nmr.mgh.harvard.edu [mailto:homer-users-bounces at nmr.mgh.harvard.edu] On Behalf Of Hörmetjan Yiltiz
Sent: Sunday, February 01, 2015 3:25 AM
To: homer-users at nmr.mgh.harvard.edu
Subject: [Homer-users] Data acquisition via Homer2

 

Hi,

 

We are using CW6 devices by Techen for our studies using fNIRS in China. The agent company in China provided us with some compiled executables which can be used to configure the source/detector probe maps (SD files) and another one with similar GUI with Homer2 to acquire the fNIRS raw data. 

 

I think this should be a standard way of acquiring the data from CW6 using Homer2. However, they told us that the executable used for acquiring the data is not open sourced (nor free software as in freedom) so that I am unable to inspect the code to understand exactly what happens for the *raw* data just after it is acquired by the detectors.

 

Suppose we have a simple probe as below, with detectors D1, D2 and source SA and SB with 3cm distance between each adjacent combination. The line indicates a channel defined by the SD file.

 

D1 ---  SA   D2 -- SB

    CHN1        CHN2

 

So, detector D2 not only receives light emitted form source SB as expected, it is also able to and will receive light emitted form source SA. So how exactly (it is just said via *intensity modulation* in the User Manual, without the specific parameters and exact algorithm). 

 

This question is not trivial since we are using a probe such as this:

 

D1    D2

  \    /

   \  /

    x

   /  \

  /    \

S1   S2

 

And we are worried whether signals that goes through the same location of the brain will get corrupted by each other. The technician assured us that they won't, yet I still would love to understand how exactly is that achieved.

 

Is it that the sources emits lasers with different intensity or pulses with different frequencies so that after the detectors receive the lights, the signals are decomposed using Fourier transformation or alike?

 

 

​Best

，
========================
He who is worthy to receive his days and nights is worthy to receive* all 
else* from you (and me).
                                                 The Prophet, Gibran Kahlil 

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