Question

2. Suggest a method to measure hysteresis in a blood flow transducer.

Answer 1

The technique used for measuring hysteresis (lagging retardation effect) in a blood flow transducer is the most common technique. It is used to measure arterial blood flow by using flow probes or sensors.

• This technique can be divided into two categories by using ultrasonic and electromagnetic probes.
• Here, two types of ultrasonic probes are used and the first type of probe measures the flow of blood by employing doppler shifts.
• The second type of probe measures transit time which employs ultrasound wave.
• These probes must be highly accurate to exhibit signal linearity over the range of blood flow.
• They must also exhibit good biocompatibility.
• The reference sample hematogenously delivers microspheres. This can be used to assess blood flow in the entire body.
• The doppler ultrasound also helps in visualizing the blood flow.
• The probe is mechanically coupled to the 'resolver', which gives electrical output and the imaging is done by moving the probe through the skin.
• This develops a 3D image in computer, which gives the measurement of hysteresis.

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