ARDMS SPI STUDY GUIDE NEWEST ACTUAL

ARDMS SPI STUDY GUIDE NEWEST ACTUAL /

QUESTIONS WITH 100% CORRECT ANSWERS

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What would cause an increase in frame rate? - ----Answers-- -Decreasing the imaging depthwould increase the frame rate

When you decrease the imaging depth it can work faster (increase frame rate) because it doesn't have to go as deep.

The diameter of the beam in the Fresnel zone/near zone does what? - ----Answers---Decreases

Which resolution is best in the clinical imaging? - ---- Answers---Axial resolution is best in imaging

will increase the near zone length? - ----Answers---A large crystal diameter with high frequency would increase the near zone length

What will decrease beam divergence in the far field? - ---- Answers---A large crystal diameter and high frequency would decrease the beam divergence in the far field

Imaging transducers have - ----Answers---Imaging transducers have low quality factors and wide bandwidiths. 1 / 4

What is the speed of a wave with a wavelength of 3 m and a frequency of .1 Hz? - ----Answers---0.3 m/s

wave speed= frequency x wavelength

Wavelength and Frequency are - ----Answers---inversely proportional to each other

How do you calculate the speed of a wave given the wavelength and frequency? - ----Answers---Frequency (Hz) x wavelength (distance)= Wave Speed

What is the speed of a wave with a frequency of 2 Hz and a wavelength of 87 m? - ----Answers---174 m/s

2Hz x 87m= 174m/s

speed of a wave: frequency x wavelength

The ____ of a wave is the number of wavelengths that pass a fixed point in a second. - ----Answers---frequency

Frequency is the number of wavelengths that pass a fixed point in a second

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A sound wave is traveling in the body and propagates from muscle to air. What percentage of the sound wave is most likely reflected at the muscle-air boundary? - ----Answers--- 75%

Which of the following lists is in decreasing order? - ---- Answers---Mega, kilo, deca, milli, nano

The conversion of sound energy to heat - ----Answers--- Absorption

Acoustic Speckle - ----Answers---the interference pattern caused by scatterers that produces the granular appearance of tissue on a sonographic image

Acoustic Variables - ----Answers---changes that occur within a medium as a result of sound traveling through that medium

Amplitude - ----Answers---The maximum or minimum deviation of an acoustic variable from the average value of that variable; the strength of the reflector

Attenuation - ----Answers---A decrease in the amplitude and intensity of the sound beam as sound travels through tissue.

Attenuation Coefficient - ----Answers---The rate at which sound is attenuated per unit depth 3 / 4

Axial Resolution - ----Answers---The ability to accurately identify reflectors that are arranged parallel to the ultrasound beam

Backscatter - ----Answers---Scattered sound waves that make their way back to the transducer and produce an image on the display

Beam Uniformity Ratio - ----Answers---The ratio of the center intensity to the average spatial intensity; also referred to as the SP/SA factor or beam uniformity coefficient

Capacitive Micromachined Ultrasound Transducers - ---- Answers---Technology used to create comparable transducer technology to piezoelectric materials

Compression - ----Answers---An area in the sound wave of high pressure and density

Continuous Wave - ----Answers---Sound that is continuously transmitted

Damping - ----Answers---The process of reducing the number of cycles of each pulse in order to improve axial resolution

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