DMS 216 PHYSICS EXAM QUESTIONS
COMPLETE WITH 100% VERIFIED
ANSWERS
\.A Sound wave is created by transducer, reflects off an object, and returns to the
transducer. The depth of the reflector is 10 cm in soft tissue. What is the go return
time? - ANSWERS✔-130 microseconds
\.A Sound wave is created by transducer, reflects off an object, and returns to the
transducer. The go return time is 26 µs. What is the depth of the reflector? -
ANSWERS✔-2cm
\.A Sound wave is created by transducer, reflects off an object, and returns to the
transducer. The go return time is 26 µs. What is the total distance that the port
traveled? - ANSWERS✔-4cm
\.The maximum imaging depth during an ultrasound exam is 10 cm. The
sonographer adjust the imaging death to 20 cm. What happens to pulse repetition
period? - ANSWERS✔-It is doubled
\.The maximum imaging depth during an ultrasound exam is 10 cm. Sonographer
adjust the imaging that to 20 cm. What happens to pulse repetition frequency? -
ANSWERS✔-It is halved
,\.The imaging depth during an ultrasound exam is 10cm. The sonographer adjust
the imaging depth to 5 cm. What happens to Pulse repetition period? -
ANSWERS✔-It is halved
\.A sound wave is created by transducer, reflects of an object, and returns to the
transducer. The imaging depth is 10 cm and soft tissue. What is the maximum
pulse repetition frequency? - ANSWERS✔-7.7kHz
\.A sound wave is created by transducer, reflects off an object, and returns to the
transducer. The maximum imaging depth is 7.7 cm. What is the PRF? -
ANSWERS✔-10,000 Hz
\.A sound wave is created by transducer, reflects off an object and returns to the
transducer. The go return time is 130 microseconds. What is the maximum PRF? -
ANSWERS✔-7,700 Hz
\.Pulse length is _______ related to pulse duration - ANSWERS✔-directly
\.Q-factor is ___________ related to bandwidth - ANSWERS✔-inversely
\.Pulse duration is ______ related to bandwidth. - ANSWERS✔-Inversely
\.The sensitivity of transducers they create short duration pulses is likely to be
______ than that of transducers that create long pulses. - ANSWERS✔-Less than
,\.All of the following correctly describes an imaging transducer except: -
ANSWERS✔-High sensitivity
\.T or F. Shorter duration events (such as dampened pulses) are more likely to be
wide bandwidth. - ANSWERS✔-True
\.The acoustic impedance of the matching layer is approximately the same as the
acoustic impedance of skin. - ANSWERS✔-False. The impedance of the matching
layer is greater than the impedance of the skin.
\.Imaging transducers are usually of high rather than low bandwidth. -
ANSWERS✔-True
Imaging transducers are high or wide bandwidth (broadband)
\.A very high Q factor transducer is used more often in diagnostic imaging
transducers than a low Q factor - ANSWERS✔-False
Imaging transducers are low Q
\.A pulse with a long pulse duration is likely to have a narrow bandwidth -
ANSWERS✔-True.
\.The damping material in a transducer increases the sensitivity - ANSWERS✔-
False. Damping reduces sensitivity.
, \.The damping material in a transducer increases the pulse length. - ANSWERS✔-
False
\.The damping material in a transducer decreases the pulse duration. -
ANSWERS✔-True
\.The damping material in a transducer improves the systems lateral resolution. -
ANSWERS✔-False
\.The damping material in a transducer decreases the bandwidth - ANSWERS✔-
False
\.The damping material in a transducer improves the system's longitudinal
resolution. - ANSWERS✔-True
\.The damping material in a transducer decreases the quality factor. - ANSWERS✔-
True
\.If the frequency of the electrical excitation voltage of a pulsed wave transducer
is 6MHz, then the operating frequency of the transducer is 6MHz. - ANSWERS✔-
False. With pulsed wave transducers, the frequency of sound is not determined by
the electrical signal.
\.If PRF increases, then PRP: - ANSWERS✔-decreases
COMPLETE WITH 100% VERIFIED
ANSWERS
\.A Sound wave is created by transducer, reflects off an object, and returns to the
transducer. The depth of the reflector is 10 cm in soft tissue. What is the go return
time? - ANSWERS✔-130 microseconds
\.A Sound wave is created by transducer, reflects off an object, and returns to the
transducer. The go return time is 26 µs. What is the depth of the reflector? -
ANSWERS✔-2cm
\.A Sound wave is created by transducer, reflects off an object, and returns to the
transducer. The go return time is 26 µs. What is the total distance that the port
traveled? - ANSWERS✔-4cm
\.The maximum imaging depth during an ultrasound exam is 10 cm. The
sonographer adjust the imaging death to 20 cm. What happens to pulse repetition
period? - ANSWERS✔-It is doubled
\.The maximum imaging depth during an ultrasound exam is 10 cm. Sonographer
adjust the imaging that to 20 cm. What happens to pulse repetition frequency? -
ANSWERS✔-It is halved
,\.The imaging depth during an ultrasound exam is 10cm. The sonographer adjust
the imaging depth to 5 cm. What happens to Pulse repetition period? -
ANSWERS✔-It is halved
\.A sound wave is created by transducer, reflects of an object, and returns to the
transducer. The imaging depth is 10 cm and soft tissue. What is the maximum
pulse repetition frequency? - ANSWERS✔-7.7kHz
\.A sound wave is created by transducer, reflects off an object, and returns to the
transducer. The maximum imaging depth is 7.7 cm. What is the PRF? -
ANSWERS✔-10,000 Hz
\.A sound wave is created by transducer, reflects off an object and returns to the
transducer. The go return time is 130 microseconds. What is the maximum PRF? -
ANSWERS✔-7,700 Hz
\.Pulse length is _______ related to pulse duration - ANSWERS✔-directly
\.Q-factor is ___________ related to bandwidth - ANSWERS✔-inversely
\.Pulse duration is ______ related to bandwidth. - ANSWERS✔-Inversely
\.The sensitivity of transducers they create short duration pulses is likely to be
______ than that of transducers that create long pulses. - ANSWERS✔-Less than
,\.All of the following correctly describes an imaging transducer except: -
ANSWERS✔-High sensitivity
\.T or F. Shorter duration events (such as dampened pulses) are more likely to be
wide bandwidth. - ANSWERS✔-True
\.The acoustic impedance of the matching layer is approximately the same as the
acoustic impedance of skin. - ANSWERS✔-False. The impedance of the matching
layer is greater than the impedance of the skin.
\.Imaging transducers are usually of high rather than low bandwidth. -
ANSWERS✔-True
Imaging transducers are high or wide bandwidth (broadband)
\.A very high Q factor transducer is used more often in diagnostic imaging
transducers than a low Q factor - ANSWERS✔-False
Imaging transducers are low Q
\.A pulse with a long pulse duration is likely to have a narrow bandwidth -
ANSWERS✔-True.
\.The damping material in a transducer increases the sensitivity - ANSWERS✔-
False. Damping reduces sensitivity.
, \.The damping material in a transducer increases the pulse length. - ANSWERS✔-
False
\.The damping material in a transducer decreases the pulse duration. -
ANSWERS✔-True
\.The damping material in a transducer improves the systems lateral resolution. -
ANSWERS✔-False
\.The damping material in a transducer decreases the bandwidth - ANSWERS✔-
False
\.The damping material in a transducer improves the system's longitudinal
resolution. - ANSWERS✔-True
\.The damping material in a transducer decreases the quality factor. - ANSWERS✔-
True
\.If the frequency of the electrical excitation voltage of a pulsed wave transducer
is 6MHz, then the operating frequency of the transducer is 6MHz. - ANSWERS✔-
False. With pulsed wave transducers, the frequency of sound is not determined by
the electrical signal.
\.If PRF increases, then PRP: - ANSWERS✔-decreases
