FREE AND STUDY GAMES ABOUT ULTRASOUND PHYSICS

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FREE AND STUDY GAMES ABOUT ULTRASOUND PHYSICS

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -98 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: What does the beam uniformity coefficient measure and what is the equation for it?

Answer:

it's an index of how evenly an US beam is distributed throughout space; BUC = spatial peak / spatial average (SP/SA) Question 2: What is the relationship between imaging depth and pulse repetition frequency?

Answer:

inverse; as imaging depth increases, pulse repetition frequency decreases Question 3: What is the relationship between pulse duration and imaging quality?

Answer:

inverse; as pulse duration increases, axial resolution decreases, and therefore image quality decreases Question 4: What is the relationship between density/stiffness of a medium and propagation speed?

Answer:

direct; as density/stiffness increases, propagation speed increases

Question 5: Define period, in relation to US

Answer:

TIME it takes for one cycle to occur

Question 6: What is the relationship between beam area and beam intensity?

Answer:

inverse; as beam area increases, beam intensity decreases; I = P/A Question 7: Rank the following highest to lowest in regards to attenuation: water, muscle, fat, bone, air, blood

Answer:

air, bone, muscle, fat, blood, water Question 8: What is the relationship between elasticity of a medium and propagation speed?

Answer:

inverse; as elasticity increases, propagation speed decreases

Question 9: What determines the speed at which a wave travels through a medium?

Answer:

medium ONLY; all sound waves of any frequency, period, intensity, and power travel at the same speed in a given medium Question 10: What is the relationship between pulse repetition frequency and pulse repetition period?

Answer:

reciprocal

Question 11: What is the relationship between frequency and image quality?

Answer:

direct; higher frequency usually yields greater detail and therefore higher quality images Question 12: What is the relationship between imaging depth and pulse repetition period?

Answer:

direct; as imaging depth increases, pulse repetition period increases

Question 13: What is the unit of propagation speed?

Answer:

speed = distance/time Question 14: Describe the mechanics of a sound wave as it travels through a vacuum

Answer:

IT'S A TRICK! sound cannot travel through a vacuum Question 15: Pulse repetition frequency and pulse repetition period only change when what is altered?

Answer:

imaging depth Question 16: As sound travels through a medium, what term describes the effects of the medium on the sound wave?

Answer:

acoustic propagation properties

Question 17: What is the unit for power?

Answer:

watts Question 18: From highest to lowest, order the measurements of US beam intensity.

Answer:

-SPTP/SPPA spatial peak temporal peak/spatial peak pulse average (pulse duration only) -SATP/SAPA spatial ave. temp. peak/spatial ave. pulse ave. (includes listening time) -SPTA spatial peak temp average -SATA spatial ave. temp. ave.

(TP aka PA)

Question 19: Define infrasound

Answer:

acoustic wave with a frequency less than 20 Hz

Question 20: Rank the following highest to lowest in regards to propagation speed: air, bone, soft tissue, tendon, fat

Answer:

bone, tendon, soft tissue, fat, air

Question 21: Define wavelength

Answer:

the distance from the beginning to the end of one cycle

Question 22: What is the equation for a wave's amplitude?

Answer:

(max value-min value) / 2

Question 23: Define attenuation coefficient

Answer:

amount of attenuation PER CENTIMETER Question 24: Acoustic variables identify certain waves as sound waves, these quantities are...

Answer:

-pressure -density -particle motion

Question 25: Define constructive interference

Answer:

an interaction of echoes that leads to reinforcement rather than destruction of waves; in-phase

Question 26: What is the most commonly used unit to measure acoustic pressure?

Answer:

pascals; Pa; 1 Pa = 1 N/m^2

Question 27: What is the equation for wavelength?

Answer:

wavelength = speed of sound/frequency mm = 1.54/MHz