Optimizing probe design for an implantable perfusion and oxygenation sensor.

Biomed Opt Express · 2011 · PMC3149511 · PMID 21833350

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a decreasing trendno p-value reported

However, past 6-8 mm edge to edge separation the ratio showed a decreasing trend that is due to the system noise since the total intensity at this point is close to the detection limit of our hardware.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.