DMS 104 Exam Questions With Complete Solutions
21.7 km = ?cm Correct Answers 2170000
2MHz = KHz? Correct Answers 2000 KHz
3m =mm Correct Answers 3000
5 MHz denotes Correct Answers 5 million cycles per second
A decrease in amplitude by a factor of 10 is equal to..? Correct
Answers -20 db
a natural property of sound waves to spread out further they
travel from the source is known as Correct Answers diffraction
A wave of acoustic energy is leaving soft tissue and transmitting
into fat with a 45 degree angle. What is true of the angle of
transmission? Correct Answers it is less than 45 degrees
A waveform transfers _____ from one point in space to another
point in space. Correct Answers energy
Absorption is best characterized as: Correct Answers energy
converted to heat
Absorption is the conversion of sound into Correct Answers
heat
Are pulse duration and duty factor directly proportional? Correct
Answers yes
, As an ultrasound wave travels through the body, does the
amplitude usually decrease? Correct Answers yes
As compressibility of a medium increases the propagation
speed... Correct Answers decreases
As depth increases what happens to the PRF? Correct Answers
increases
At which degree does refraction not occur? Correct Answers 90
degrees
Does a longer pulse duration leads to a wider bandwidth?
Correct Answers no
Does a negative dB mean "getting smaller?" Correct Answers
yes
Does PRP decrease as velocity increases? Correct Answers yes
Higher frequency results in ? penetration and ? absorption
Correct Answers decreased, increased
How far away is an interface in tissue if the elapsed time for the
sound wave to return in 100 us? Correct Answers 7.7 cm
How far away is an interface in tissue if the elapsed time for the
sound wave to travel out and back is 100 microseconds? Correct
Answers 7.7 cm
21.7 km = ?cm Correct Answers 2170000
2MHz = KHz? Correct Answers 2000 KHz
3m =mm Correct Answers 3000
5 MHz denotes Correct Answers 5 million cycles per second
A decrease in amplitude by a factor of 10 is equal to..? Correct
Answers -20 db
a natural property of sound waves to spread out further they
travel from the source is known as Correct Answers diffraction
A wave of acoustic energy is leaving soft tissue and transmitting
into fat with a 45 degree angle. What is true of the angle of
transmission? Correct Answers it is less than 45 degrees
A waveform transfers _____ from one point in space to another
point in space. Correct Answers energy
Absorption is best characterized as: Correct Answers energy
converted to heat
Absorption is the conversion of sound into Correct Answers
heat
Are pulse duration and duty factor directly proportional? Correct
Answers yes
, As an ultrasound wave travels through the body, does the
amplitude usually decrease? Correct Answers yes
As compressibility of a medium increases the propagation
speed... Correct Answers decreases
As depth increases what happens to the PRF? Correct Answers
increases
At which degree does refraction not occur? Correct Answers 90
degrees
Does a longer pulse duration leads to a wider bandwidth?
Correct Answers no
Does a negative dB mean "getting smaller?" Correct Answers
yes
Does PRP decrease as velocity increases? Correct Answers yes
Higher frequency results in ? penetration and ? absorption
Correct Answers decreased, increased
How far away is an interface in tissue if the elapsed time for the
sound wave to return in 100 us? Correct Answers 7.7 cm
How far away is an interface in tissue if the elapsed time for the
sound wave to travel out and back is 100 microseconds? Correct
Answers 7.7 cm
