Which laser is used in Laser doppler blood flowmeter?(a) Nd-YAG(b) Argon(c) He-Ne(d) CO2I have been asked this question during an interview.Asked question is from PACS (Picture Archiving and Communication System) in portion Telemedicine Technology of Biomedical Instrumentation

Which laser is used in Laser doppler blood flowmeter?(a) Nd-YAG(b) Arg

1.	Which laser is used in Laser doppler blood flowmeter?(a) Nd-YAG(b) Argon(c) He-Ne(d) CO2I have been asked this question during an interview.Asked question is from PACS (Picture Archiving and Communication System) in portion Telemedicine Technology of Biomedical Instrumentation
Answer» Right option is (c) He-Ne For EXPLANATION: In principle, LIGHT from a low power (5 mW) He–Ne laser is coupled into a quartz fibre and transmitted to the skin. The light is reflected from both the non-moving tissues (reference beam) and moving red blood cells (Doppler-shifted beam). The two beams are received by a plastic fibre and transmitted BACK to a photo-diode where optical heterodyning takes PLACE.

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Which laser is used in Laser doppler blood flowmeter?(a) Nd-YAG(b) Argon(c) He-Ne(d) CO2I have been asked this question during an interview.Asked question is from PACS (Picture Archiving and Communication System) in portion Telemedicine Technology of Biomedical Instrumentation

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