ARDMS SPI EXAM LATEST EXAM 200+ ACTUAL QUESTIONS
AND VERIFIED ANSWERS||GRADED A
1. what type of wave is a sound wave? longitudinal, me-
chanical
2. molecules of the medium vibrate at 90 degrees to the transverse wave
direction of the traveling wave
3. what is the range of audible sound? 20 Hz to 20 kHz
4. portion of a cycle where the molecules are pushed compression
closer together
5. portion of a cycle where the molecules spread farther rarefaction
apart
6. what are the three primary acoustic variables? pressure, density,
particle motion
7. the time it takes for one cycle to occur period
8. the number of cycles per second frequency
9. relationship between period and frequency inverse
10. the speed at which sound travels through a medium propagation
speed (c)
11. relationship between stiffness and propagation direct
speed
12. "c" of soft tissue 1540 m/s or 1.54
mm/usec
13. relationship between density, compressibility & elas- inverse
ticity to propagation speed
14. length of a single cycle wavelength
15. wavelength formula propagation
speed/frequency
, ARDMS SPI EXAM LATEST EXAM 200+ ACTUAL QUESTIONS
AND VERIFIED ANSWERS||GRADED A
16. max or min deviation of an acoustic variable from the amplitude
average value of that variable
17. units of pressure amplitude pascals (Pa)
18. the rate at which work is performed power
19. how are power and amplitude proportioned? power = amplitude
squared
20. intensity formula power/area
(w/cm^2)
21. resistance to the propagation of sound through a impedance (z)
medium
22. units for impedance rayls
23. what causes a strong reflection? 90 degree inci-
dence and strong
impedance mis-
match
24. impedance formula z = density
(p) x propagation
speed (c)
25. sound waves are sent into the body and the returning pulse-echo tech-
wave is timed to determine the reflectors distance nique
from the transducer
26. most common element material lead zirconate ti-
tanate (PZT)
27. pressure is created when voltage is applied to a piezoelectric prin-
material and electricity is created when pressure is ciple
applied to the material
28. number of pulses produced in 1 second pulse repetition
frequency (kHz)
, ARDMS SPI EXAM LATEST EXAM 200+ ACTUAL QUESTIONS
AND VERIFIED ANSWERS||GRADED A
29. relationship between frequency and PRF none
30. how are depth and PRF related inverse
31. the time from the start of one pulse to the start of the pulse repetition
next pulse period
32. relationship between PRP and PRF inverse
33. relationship between PRP and depth direct
34. time during which the sound is being transmitted pulse duration
35. pulse duration formula period x number of
cycles
36. what pulse duration is preferred for diagnostic imag- short
ing
37. how is a short pulse duration achieved? damping layer
helps to reduce #
of cycles
38. % of time that sound is actually being produced duty factor
39. duty factor formula pulse duration /
PRP
40. duty factor of CW 100%
41. what is an optimal DF for diagnostic imaging? < 1%
42. length of a pulse spatial pulse
length
43. SPL formula wavelength x
number of cycles
44. decrease in amplitude and intensity of the sound attenuation
beam as it travels through tissue
AND VERIFIED ANSWERS||GRADED A
1. what type of wave is a sound wave? longitudinal, me-
chanical
2. molecules of the medium vibrate at 90 degrees to the transverse wave
direction of the traveling wave
3. what is the range of audible sound? 20 Hz to 20 kHz
4. portion of a cycle where the molecules are pushed compression
closer together
5. portion of a cycle where the molecules spread farther rarefaction
apart
6. what are the three primary acoustic variables? pressure, density,
particle motion
7. the time it takes for one cycle to occur period
8. the number of cycles per second frequency
9. relationship between period and frequency inverse
10. the speed at which sound travels through a medium propagation
speed (c)
11. relationship between stiffness and propagation direct
speed
12. "c" of soft tissue 1540 m/s or 1.54
mm/usec
13. relationship between density, compressibility & elas- inverse
ticity to propagation speed
14. length of a single cycle wavelength
15. wavelength formula propagation
speed/frequency
, ARDMS SPI EXAM LATEST EXAM 200+ ACTUAL QUESTIONS
AND VERIFIED ANSWERS||GRADED A
16. max or min deviation of an acoustic variable from the amplitude
average value of that variable
17. units of pressure amplitude pascals (Pa)
18. the rate at which work is performed power
19. how are power and amplitude proportioned? power = amplitude
squared
20. intensity formula power/area
(w/cm^2)
21. resistance to the propagation of sound through a impedance (z)
medium
22. units for impedance rayls
23. what causes a strong reflection? 90 degree inci-
dence and strong
impedance mis-
match
24. impedance formula z = density
(p) x propagation
speed (c)
25. sound waves are sent into the body and the returning pulse-echo tech-
wave is timed to determine the reflectors distance nique
from the transducer
26. most common element material lead zirconate ti-
tanate (PZT)
27. pressure is created when voltage is applied to a piezoelectric prin-
material and electricity is created when pressure is ciple
applied to the material
28. number of pulses produced in 1 second pulse repetition
frequency (kHz)
, ARDMS SPI EXAM LATEST EXAM 200+ ACTUAL QUESTIONS
AND VERIFIED ANSWERS||GRADED A
29. relationship between frequency and PRF none
30. how are depth and PRF related inverse
31. the time from the start of one pulse to the start of the pulse repetition
next pulse period
32. relationship between PRP and PRF inverse
33. relationship between PRP and depth direct
34. time during which the sound is being transmitted pulse duration
35. pulse duration formula period x number of
cycles
36. what pulse duration is preferred for diagnostic imag- short
ing
37. how is a short pulse duration achieved? damping layer
helps to reduce #
of cycles
38. % of time that sound is actually being produced duty factor
39. duty factor formula pulse duration /
PRP
40. duty factor of CW 100%
41. what is an optimal DF for diagnostic imaging? < 1%
42. length of a pulse spatial pulse
length
43. SPL formula wavelength x
number of cycles
44. decrease in amplitude and intensity of the sound attenuation
beam as it travels through tissue
