DAVIES PHYSICS SPI QUESTIONS AND ANSWERS
- What can you do to enhance the visibility of a specular reflector?
A) Scan w/ the lowest possible frequency
B) Scan w/ oblique incidence
C) Scan w/ perpendicular incidence
D) Increase distance to the reflector
E) Scan w/ an incident angle of 45 degrees - Answers - C) Increase distance to the
reflector
- Acoustic impedance increases w/ which of the following?
A) Increased tissue density
B) Increased propagation speed
C) Increased transducer frequency
D) A & B
E) All the above - Answers - D) A & B
A) Increased tissue density
B) Increased propagation speed
- As a general observation about media in diagnostic sonography, sound propagates
faster in materials w/ greater:
A) Compressibility
B) Acoustic Impedance
C)Stiffness
D) Refractive Index
E) All the above - Answers - C) Stiffness
- Which of the following terms denotes the time it takes for one cycle to occur?
A) Frequency
B) Amplitude
C) Wavelength
D) Period
E) Pressure - Answers - D) Period
- Which of the following would increase the spatial pulse length?
A) Increased PRF
B) Decreased # of transmit pulses per frame
C) Increased # of transmit pulses per second
D) Increased # of transmit pulses per line
E) Increased # of cycles per pulse - Answers - E) Increased # of cycles per pulse
, - In order to display a structure on your sonographic image, the sound beam must be
reflected at the interference. What is required for sound reflection at the interference of
two structures?
A) Oblique incidence at the interference boundary
B) Temperature differences between the two media
C) A difference in the acoustic impedance of the media
D) Different media diameters
E) Different attenuation coefficients - Answers - C) A difference in the acoustic
impedance of the media
- When you change the transmit frequency, which of the following is altered?
A) Displacement amplitude of the particles in the medium
B) Speed at which the sound wave propagates through the medium
C) # of cycles per second
D) Pulses transmitted per second
E) # of electric impulses applied to the transducer per second - Answers - C) # of cycles
per second
- While performing a sonographic exam, you encounter the following interfaces. Which
will produce the weakest reflected signal?
A) Organ parenchyma/fluid
B) Organ parenchyma/air
C) Organ parenchyma /organ parenchyma
D) Organ parenchyma/ bone
E) Organ parenchyma/ ligament - Answers - C) Organ parenchyma /organ parenchyma
- While performing a Doppler U/S examination, you adjust the pulse repetition frequency
to 12 kHz. This can also be expressed as:
A) 0.12 Hz
B) 1200 Hz
C) 1.2 Hz
D) 12,000 Hz
E) 120 MHz - Answers - D) 12,000 Hz
- You are imaging a rounded mass w/ irregular borders. The mass has a much slower
propagation speed than surrounding tissue. What sound-tissue interaction will be
encountered as the U/S propagates through this interface?
A) Refraction
B) Reflection
C) Absorption
- What can you do to enhance the visibility of a specular reflector?
A) Scan w/ the lowest possible frequency
B) Scan w/ oblique incidence
C) Scan w/ perpendicular incidence
D) Increase distance to the reflector
E) Scan w/ an incident angle of 45 degrees - Answers - C) Increase distance to the
reflector
- Acoustic impedance increases w/ which of the following?
A) Increased tissue density
B) Increased propagation speed
C) Increased transducer frequency
D) A & B
E) All the above - Answers - D) A & B
A) Increased tissue density
B) Increased propagation speed
- As a general observation about media in diagnostic sonography, sound propagates
faster in materials w/ greater:
A) Compressibility
B) Acoustic Impedance
C)Stiffness
D) Refractive Index
E) All the above - Answers - C) Stiffness
- Which of the following terms denotes the time it takes for one cycle to occur?
A) Frequency
B) Amplitude
C) Wavelength
D) Period
E) Pressure - Answers - D) Period
- Which of the following would increase the spatial pulse length?
A) Increased PRF
B) Decreased # of transmit pulses per frame
C) Increased # of transmit pulses per second
D) Increased # of transmit pulses per line
E) Increased # of cycles per pulse - Answers - E) Increased # of cycles per pulse
, - In order to display a structure on your sonographic image, the sound beam must be
reflected at the interference. What is required for sound reflection at the interference of
two structures?
A) Oblique incidence at the interference boundary
B) Temperature differences between the two media
C) A difference in the acoustic impedance of the media
D) Different media diameters
E) Different attenuation coefficients - Answers - C) A difference in the acoustic
impedance of the media
- When you change the transmit frequency, which of the following is altered?
A) Displacement amplitude of the particles in the medium
B) Speed at which the sound wave propagates through the medium
C) # of cycles per second
D) Pulses transmitted per second
E) # of electric impulses applied to the transducer per second - Answers - C) # of cycles
per second
- While performing a sonographic exam, you encounter the following interfaces. Which
will produce the weakest reflected signal?
A) Organ parenchyma/fluid
B) Organ parenchyma/air
C) Organ parenchyma /organ parenchyma
D) Organ parenchyma/ bone
E) Organ parenchyma/ ligament - Answers - C) Organ parenchyma /organ parenchyma
- While performing a Doppler U/S examination, you adjust the pulse repetition frequency
to 12 kHz. This can also be expressed as:
A) 0.12 Hz
B) 1200 Hz
C) 1.2 Hz
D) 12,000 Hz
E) 120 MHz - Answers - D) 12,000 Hz
- You are imaging a rounded mass w/ irregular borders. The mass has a much slower
propagation speed than surrounding tissue. What sound-tissue interaction will be
encountered as the U/S propagates through this interface?
A) Refraction
B) Reflection
C) Absorption
