Sonography Canada – Core 114 Complete Questions
And Answers (A+)
Quiz :what is the I SPPA for mechanical bioeffects? - Answer :190W/cm^2
Quiz :what is the I SPTA for thermal bioeffects? - Answer :720mW/cm^2
Quiz :recommended MI for fetal scanning - Answer :MI < 1.9
Quiz :recommended TI for fetal scanning - Answer :TI < 0.7
Quiz :after what fetal age is safe to use PW doppler? - Answer :14 weeks
Quiz :what does ALARA stand for - Answer :as low as reasonably achievable
Quiz :frequency - Answer :# of cycles/second
f = 1/p
Quiz :period - Answer :time it takes for 1 cycle to occur (usec)
P = 1/f
Quiz :wavelength - Answer :length of 1 cycle (mm)
wavelength = c/f
inversely proportionate to frequency
Quiz :assumed speed of sound in soft tissue - Answer :1540 m/s
1.54mm/usec
Quiz :intensity - Answer :I = power/area
measured in Watts
proportionate to amplitude squared
Quiz :range equation - Answer :distance to reflector = 1/2 speed of sound x
GRT
Quiz :go return time (GRT) - Answer :13usec for 1cm of depth
Quiz :acoustic impedance (z) - Answer :difference between media
determining % reflection and % transmission of sound (Rayls)
z= density x speed of sound
, z=pxc
Quiz :% reflection equation - Answer :
Quiz :larger AI difference results in ___ reflection - Answer :greater
Quiz :pulse duration (PD) - Answer :time for one pulse
tx is ringing
PD = period x n; n = # of cycles in pulse
Quiz :pulse repetition period (PRP) - Answer :the time from the beginning of
one pulse to the beginning of the next
time tx is ringing and listening for 1 scan line
PRP = 13usec/cm x imaging depth
Quiz :pulse repetition frequency (PRF) - Answer :# of pulses in 1 second (kHz)
PRF = 1/PRP
Quiz :duty factor - Answer :% tx is ringing over tx ringing and listening
DF = (PD/PRP) x 100%
Quiz :frame time - Answer :time it takes to create a single frame (msec)
FT = PRP x lines/frame
Quiz :frame rate - Answer :# of frames per second (Hz)
FR = 1/FT
Quiz :spatial pulse length (SPL) - Answer :length of space of one pulse (mm)
SPL = wavelength x n; n = # of cycles in pulse
Quiz :Is sound a transverse or longitudinal wave? - Answer :longitudinal
Quiz :what kind of pressure wave is sound? - Answer :mechanical
Quiz :infrasound range - Answer :< 20Hz
Quiz :audible sound range - Answer :20Hz - 20kHz
Quiz :ultrasound range - Answer :>20kHz
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