ARDMS SPI EXAM QUESTIONS WITH ALL CORRECT ANSWERS
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 ...
ARDMS SPI EXAM QUESTIONS WITH
ALL CORRECT ANSWERS
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
duty factor formula - ANSWER- pulse duration / PRP
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