The key factor determining the fraction of ultrasound reflected at a large inter

Question

The key factor determining the fraction of ultrasound reflected at a large interface is: (not sure)

Depth of the interface

Transducer diameter

Transducer output intensity

Differences in acoustic impedance

Scan mode

Higher frequency transducers have increased:

Thickness

Intensity

Attenuation

Velocity

Wavelength

A 2 MHz transducer has an approximate wavelength of:

0.01m

0.1m

1 mm

1 m

More than 10m

Snell’s law describes the relation between the:

Incidence and transmission angles

Fraunhofer angle and wavelength

Reflection and refraction angle

Focus and transducer curvature

Fresnel zone and wavelength.

The velocity of an ultrasound beam is always

Constant

Proportional to angle

Equal to frequency multiply wavelength

Equal to the velocity of the cells in tissue

3,000,000km/s

The Doppler effect from a moving object depends on all of the following except:

Speed of U/S

Frequency

Angle between beam and object

Object depth

Object speed

Explanation / Answer

Part (a): Option (d): Difference in acoustic impedance

Part (b): Option (c): Attenuation

Part (c): Option (c): ~ 1 mm

Part (d): Option (a): Angle of incidence and refraction

According to chegg guidelines I can answer only 4 parts of above question, so please post other parts seperately. Please rate my answer if you find it helpful, good luck...

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