ULTRASOUND PHYSICS - MOCK EXAM QUESTIONS AND ANSWERS
The duty factor of CW Doppler is 100% - CORRECT ANSWER✅✅✅True
Absence of color on a color Doppler image always indicates a region of no blood flow. - CORRECT
ANSWER✅✅✅False
The SPTA intensity will always be larger than the SATA intensity. - CORRECT ANSWER✅✅✅True
The beam diameter is constant in the near zone. - CORRECT ANSWER✅✅✅False
in a pulse-echo system, the quality factor should be made as large as possible. - CORRECT
ANSWER✅✅✅False
The Doppler shift produces information about speed. - CORRECT ANSWER✅✅✅False, velocity tho
Aliasing is never seen with Continuous Wave Doppler. - CORRECT ANSWER✅✅✅True
Grating lobes are markedly reduced by the use of harmonics. - CORRECT ANSWER✅✅✅True
Smaller transducers produce smaller beam diameters. - CORRECT ANSWER✅✅✅True
The near zone length should be kept as short as possible. - CORRECT ANSWER✅✅✅False
An example of a nonspecular reflector is: - CORRECT ANSWER✅✅✅red blood cells
The beam of an unfocused transducer - CORRECT ANSWER✅✅✅in the Fraunhofer zone
Beams from a phased array transducer are steered by: - CORRECT ANSWER✅✅✅Varying the timing
of pulses to the PZ elements
, Lateral resolution: ________ - CORRECT ANSWER✅✅✅depends on the beam diameter
Reverberation artifacts are a result of: - CORRECT ANSWER✅✅✅the presence of two or more strong
reflecting surfaces
Decreasing the spatial pulse length: - CORRECT ANSWER✅✅✅improves axial resolution
Propagation speed errors result in: - CORRECT ANSWER✅✅✅improper axial position
The Doppler shift frequency is: - CORRECT ANSWER✅✅✅directly proportional to the velocity of the
reflector
If the amplitude is doubled, the intensity is: - CORRECT ANSWER✅✅✅increased by four times
For maximum transfer of energy to occur, the backing material must have: - CORRECT
ANSWER✅✅✅an acoustic Z identical to that of the crystal
The period of an ultrasound wave is: - CORRECT ANSWER✅✅✅the time of one wavelength
Enhancement is caused by: - CORRECT ANSWER✅✅✅weakly attenuating structures
The intensity of the ultrasound beam is usually greater at the focal zone because of: - CORRECT
ANSWER✅✅✅the smaller beam diameter
The attenuation in soft tissue is: - CORRECT ANSWER✅✅✅increased with shorter wavelength
The operating frequency: - CORRECT ANSWER✅✅✅depends on the thickness of the crystal
The duty factor of CW Doppler is 100% - CORRECT ANSWER✅✅✅True
Absence of color on a color Doppler image always indicates a region of no blood flow. - CORRECT
ANSWER✅✅✅False
The SPTA intensity will always be larger than the SATA intensity. - CORRECT ANSWER✅✅✅True
The beam diameter is constant in the near zone. - CORRECT ANSWER✅✅✅False
in a pulse-echo system, the quality factor should be made as large as possible. - CORRECT
ANSWER✅✅✅False
The Doppler shift produces information about speed. - CORRECT ANSWER✅✅✅False, velocity tho
Aliasing is never seen with Continuous Wave Doppler. - CORRECT ANSWER✅✅✅True
Grating lobes are markedly reduced by the use of harmonics. - CORRECT ANSWER✅✅✅True
Smaller transducers produce smaller beam diameters. - CORRECT ANSWER✅✅✅True
The near zone length should be kept as short as possible. - CORRECT ANSWER✅✅✅False
An example of a nonspecular reflector is: - CORRECT ANSWER✅✅✅red blood cells
The beam of an unfocused transducer - CORRECT ANSWER✅✅✅in the Fraunhofer zone
Beams from a phased array transducer are steered by: - CORRECT ANSWER✅✅✅Varying the timing
of pulses to the PZ elements
, Lateral resolution: ________ - CORRECT ANSWER✅✅✅depends on the beam diameter
Reverberation artifacts are a result of: - CORRECT ANSWER✅✅✅the presence of two or more strong
reflecting surfaces
Decreasing the spatial pulse length: - CORRECT ANSWER✅✅✅improves axial resolution
Propagation speed errors result in: - CORRECT ANSWER✅✅✅improper axial position
The Doppler shift frequency is: - CORRECT ANSWER✅✅✅directly proportional to the velocity of the
reflector
If the amplitude is doubled, the intensity is: - CORRECT ANSWER✅✅✅increased by four times
For maximum transfer of energy to occur, the backing material must have: - CORRECT
ANSWER✅✅✅an acoustic Z identical to that of the crystal
The period of an ultrasound wave is: - CORRECT ANSWER✅✅✅the time of one wavelength
Enhancement is caused by: - CORRECT ANSWER✅✅✅weakly attenuating structures
The intensity of the ultrasound beam is usually greater at the focal zone because of: - CORRECT
ANSWER✅✅✅the smaller beam diameter
The attenuation in soft tissue is: - CORRECT ANSWER✅✅✅increased with shorter wavelength
The operating frequency: - CORRECT ANSWER✅✅✅depends on the thickness of the crystal
