[Homer-users] Wavelength difference of 5 nm

[Cooper, Robert]

Hi Jonathan,

Amber’s answer is correct I think – the easiest thing to do is to change the SD.Lambda variable in the .nirs file you are using to match what was actually emasured.  That way all downstream Homer processing will be correct.

Best,

Rob

From: homer-users-bounces at nmr.mgh.harvard.edu [mailto:homer-users-bounces at nmr.mgh.harvard.edu] On Behalf Of Williams, Amber
Sent: 19 July 2017 12:45
To: homer-users at nmr.mgh.harvard.edu
Subject: Re: [Homer-users] Wavelength difference of 5 nm

Are you unable to manually change the wavelength in whatever data you're working with? That would be the easiest fix as opposed to changing the Homer code that chooses the extinction coefficients to use.
Amber Williams
Department of Physics
Miami University

On Tue, Jul 18, 2017 at 6:51 PM, Jonathan Perry <walwynperry at gmail.com<mailto:walwynperry at gmail.com>> wrote:
Hello all,

Does anyone know if a change of 5 nm in wavelength will have much of a difference in data acquired for fNIRS?  My understanding is that an appropriate change in extinction coefficient in the Beer Lambert Law would control for this difference.

Is this indeed the case?  I am dealing with a difference between 780nm and 785nm.  I am concerned this may effect the data, but I am unsure.



Jonathan Perry

Master's Student

Department of Engineering Technology

University of Houston

 4734 Calhoun Rd., Room# 123

Houston, TX 77204-4021

Tel: (<tel:%28713%29%20743-4159>512)925-4910<tel:(512)%20925-4910>

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