Physics medical imaging 2.0 0.0 / 5 ? PhysicsMedical physicsA2/A-levelOCR Created by: abbin003Created on: 07-02-20 07:56 How do you generate ultrasound in an ultrasound transducer Use a high frequency and alternating p.d. Which you apply across opposite faces of the crystal 1 of 6 How do you produce an intense ultrasound signal Choose the same frequency as the natural frequency of oscillation of the crystal 2 of 6 What happens when you send ultrasound pulses into the body of the patient Each pulse of ultrasound will be partly reflected and partly transmitted at the boundary between any two different tissues 3 of 6 Define acoustic impedance The product of the density of the substance and the speed of ultrasound in that substance 4 of 6 What's the equation for acoustic impedance Z=pc 5 of 6 Why do we smear coupling gel with acoustic impedance similar to that of the skin onto the skin and transducer To overcome the problem of the air-skin boundary having 99.9. % of incident ultrasound reflected 6 of 6
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