DBS 290: Chapters 1-12 Mid Term Set
UPDATED ACTUAL Questions and
CORRECT Answers
Mechanical wave - CORRECT ANSWER -A type of wave that requires a medium to travel.
Frequency of sound wave - CORRECT ANSWER -If the frequency of a sound wave is 5 MHz, its
period is 0.2 µs.
Diagnostic ultrasound frequencies - CORRECT ANSWER -Typically range from 2-20 MHz.
Wavelength in soft tissue at 3 MHz - CORRECT ANSWER -Approximately 0.5 mm.
Pulse duration - CORRECT ANSWER -Depends on the number of cycles per pulse.
PRF - CORRECT ANSWER -If PRF is 5,000 Hz, PRP is 0.2 ms.
Duty factor of an imaging system - CORRECT ANSWER -Typically <1%.
Axial resolution - CORRECT ANSWER -Improves with shorter SPL.
Lateral resolution - CORRECT ANSWER -Is best at the focus.
Intensity relevant for bioeffects - CORRECT ANSWER -SPTA is most relevant for assessing
bioeffects.
Attenuation coefficient in soft tissue at 6 MHz - CORRECT ANSWER -Is 3 dB/cm.
UPDATED ACTUAL Questions and
CORRECT Answers
Mechanical wave - CORRECT ANSWER -A type of wave that requires a medium to travel.
Frequency of sound wave - CORRECT ANSWER -If the frequency of a sound wave is 5 MHz, its
period is 0.2 µs.
Diagnostic ultrasound frequencies - CORRECT ANSWER -Typically range from 2-20 MHz.
Wavelength in soft tissue at 3 MHz - CORRECT ANSWER -Approximately 0.5 mm.
Pulse duration - CORRECT ANSWER -Depends on the number of cycles per pulse.
PRF - CORRECT ANSWER -If PRF is 5,000 Hz, PRP is 0.2 ms.
Duty factor of an imaging system - CORRECT ANSWER -Typically <1%.
Axial resolution - CORRECT ANSWER -Improves with shorter SPL.
Lateral resolution - CORRECT ANSWER -Is best at the focus.
Intensity relevant for bioeffects - CORRECT ANSWER -SPTA is most relevant for assessing
bioeffects.
Attenuation coefficient in soft tissue at 6 MHz - CORRECT ANSWER -Is 3 dB/cm.
