The key factor determining the fraction of ultrasound reflected at a large interface is:
- 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 multiplied by wavelength
- Equal to the velocity of the cells in tissue
- 3,000,000 km/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