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Who brought out the difficulties in the extraction of useful information from backscattered light intensity from human tissue?

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Who brought out the difficulties in the extraction of useful information from backscattered light intensity from human tissue?

(a) Cohen and Wadsworth

(b) Cohen and Logini

(c) Cohen

(d) Logini

This question was addressed to me in an internship interview.

The above asked question is from Electromyograph (EMG) in chapter Biomedical Recorders of Biomedical Instrumentation

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Correct choice is (a) Cohen and Wadsworth

For explanation: Cohen and Wadsworth (1972) bring out the difficulties in the extraction of useful information from backscattered light intensity from human tissue. There are vast variations of tissue construction and optical properties among various subjects and in different locations on the same subject.

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