ARDMS SPI EXAM LATEST REAL 150
QUESTIONS AND CORRECT ANSWERS
⩥ 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
QUESTIONS AND CORRECT ANSWERS
⩥ 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
