NEWEST ARDMS SPI EXAM / ARDMS SPI REAL EXAM
WITH ACTUAL QUESTIONS AND WELL ELABORATED
ANSWERS (100% CORRECT VERIFIED ANSWERS) A NEW
UPDATED VERSION |ASSURED A+ (BRAND NEW!!)
what type of wave is a sound wave? - ANSWER: longitudinal, mechanical
molecules of the medium vibrate at 90 degrees to the direction of the traveling wave
- ANSWER: transverse wave
what is the range of audible sound? - ANSWER: 20 Hz to 20 kHz
portion of a cycle where the molecules are pushed closer together - ANSWER:
compression
portion of a cycle where the molecules spread farther apart - ANSWER: rarefaction
what are the three primary acoustic variables? - ANSWER: pressure, density, particle
motion
the time it takes for one cycle to occur - ANSWER: period
the number of cycles per second - ANSWER: frequency
relationship between period and frequency - ANSWER: inverse
the speed at which sound travels through a medium - ANSWER: propagation speed
(c)
relationship between stiffness and propagation speed - ANSWER: direct
"c" of soft tissue - ANSWER: 1540 m/s or 1.54 mm/usec
relationship between density, compressibility & elasticity to propagation speed -
ANSWER: inverse
length of a single cycle - ANSWER: wavelength
wavelength formula - ANSWER: propagation speed/frequency
max or min deviation of an acoustic variable from the average value of that variable -
ANSWER: amplitude
units of pressure amplitude - ANSWER: pascals (Pa)
, the rate at which work is performed - ANSWER: power
how are power and amplitude proportioned? - ANSWER: power = amplitude squared
intensity formula - ANSWER: power/area (w/cm^2)
resistance to the propagation of sound through a medium - ANSWER: impedance (z)
units for impedance - ANSWER: rayls
what causes a strong reflection? - ANSWER: 90 degree incidence and strong
impedance mismatch
impedance formula - ANSWER: z = density (p) x propagation speed (c)
sound waves are sent into the body and the returning wave is timed to determine
the reflectors distance from the transducer - ANSWER: pulse-echo technique
most common element material - ANSWER: lead zirconate titanate (PZT)
pressure is created when voltage is applied to a material and electricity is created
when pressure is applied to the material - ANSWER: piezoelectric principle
number of pulses produced in 1 second - ANSWER: pulse repetition frequency (kHz)
relationship between frequency and PRF - ANSWER: none
how are depth and PRF related - ANSWER: inverse
the time from the start of one pulse to the start of the next pulse - ANSWER: pulse
repetition period
relationship between PRP and PRF - ANSWER: inverse
relationship between PRP and depth - ANSWER: direct
time during which the sound is being transmitted - ANSWER: pulse duration
pulse duration formula - ANSWER: period x number of cycles
what pulse duration is preferred for diagnostic imaging - ANSWER: short
how is a short pulse duration achieved? - ANSWER: damping layer helps to reduce #
of cycles
% of time that sound is actually being produced - ANSWER: duty factor
WITH ACTUAL QUESTIONS AND WELL ELABORATED
ANSWERS (100% CORRECT VERIFIED ANSWERS) A NEW
UPDATED VERSION |ASSURED A+ (BRAND NEW!!)
what type of wave is a sound wave? - ANSWER: longitudinal, mechanical
molecules of the medium vibrate at 90 degrees to the direction of the traveling wave
- ANSWER: transverse wave
what is the range of audible sound? - ANSWER: 20 Hz to 20 kHz
portion of a cycle where the molecules are pushed closer together - ANSWER:
compression
portion of a cycle where the molecules spread farther apart - ANSWER: rarefaction
what are the three primary acoustic variables? - ANSWER: pressure, density, particle
motion
the time it takes for one cycle to occur - ANSWER: period
the number of cycles per second - ANSWER: frequency
relationship between period and frequency - ANSWER: inverse
the speed at which sound travels through a medium - ANSWER: propagation speed
(c)
relationship between stiffness and propagation speed - ANSWER: direct
"c" of soft tissue - ANSWER: 1540 m/s or 1.54 mm/usec
relationship between density, compressibility & elasticity to propagation speed -
ANSWER: inverse
length of a single cycle - ANSWER: wavelength
wavelength formula - ANSWER: propagation speed/frequency
max or min deviation of an acoustic variable from the average value of that variable -
ANSWER: amplitude
units of pressure amplitude - ANSWER: pascals (Pa)
, the rate at which work is performed - ANSWER: power
how are power and amplitude proportioned? - ANSWER: power = amplitude squared
intensity formula - ANSWER: power/area (w/cm^2)
resistance to the propagation of sound through a medium - ANSWER: impedance (z)
units for impedance - ANSWER: rayls
what causes a strong reflection? - ANSWER: 90 degree incidence and strong
impedance mismatch
impedance formula - ANSWER: z = density (p) x propagation speed (c)
sound waves are sent into the body and the returning wave is timed to determine
the reflectors distance from the transducer - ANSWER: pulse-echo technique
most common element material - ANSWER: lead zirconate titanate (PZT)
pressure is created when voltage is applied to a material and electricity is created
when pressure is applied to the material - ANSWER: piezoelectric principle
number of pulses produced in 1 second - ANSWER: pulse repetition frequency (kHz)
relationship between frequency and PRF - ANSWER: none
how are depth and PRF related - ANSWER: inverse
the time from the start of one pulse to the start of the next pulse - ANSWER: pulse
repetition period
relationship between PRP and PRF - ANSWER: inverse
relationship between PRP and depth - ANSWER: direct
time during which the sound is being transmitted - ANSWER: pulse duration
pulse duration formula - ANSWER: period x number of cycles
what pulse duration is preferred for diagnostic imaging - ANSWER: short
how is a short pulse duration achieved? - ANSWER: damping layer helps to reduce #
of cycles
% of time that sound is actually being produced - ANSWER: duty factor
