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imginit

Development Team Member
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Posts: 7
 #1 
What is the penetration depth and range for the Moxy? 
Juerg Feldmann

Fortiori Design LLC
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 #2 
I hope for roger but here  an explanation   See picture
Roger

Moderator
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 #3 
The rule of thumb that the penetration depth is about 1/2 of the emitter to detector spacing is a good first approximation but we need to interpret it for Moxy.

Moxy has a 12.5 and a 25 mm emitter to detector spacings that is uses in combination.

The Moxy algorithm assumes the tissue is made up of epidermis, dermis, adipose, and muscle but the thickness of the adipose layer is unknown.  It also assumes that each layer is homogenous.

Moxy reports the SmO2 value for the muscle layer regardless of the adipose layer thickness.  This works well for fat layers up to about 10 to 12 mm thick.  Beyond that, it still measures but the sensitivity to the muscle layer starts to drop off so the accuracy of the readings is questionable.
imginit

Development Team Member
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Posts: 7
 #4 
Roger, just to clarify: 

optode 1 has a range of 0mm-12.5mm?

optode 2 has a range of 0-25mm?

The Moxy subtracts optode 1's info from optode 2 to get information only from 12.5mm-25mm?

Roger

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 #5 
optode 1 has a range of 0mm-12.5mm?  YES

optode 2 has a range of 0-25mm?  YES

The Moxy subtracts optode 1's info from optode 2 to get information only from 12.5mm-25mm?  The mathematician in me has to say "not exactly", but that can be an OK way to think about it.  The sensor uses data from both optodes simultaneously to get high sensitivity to what's going on in the muscle layer.


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