SPI _ Sonography Principles & Instrumentation

Which gain will increase the risk of bioeffects? a. transmit b. receive c. gain d. overall gain correct answers a. transmit Which of the following is considered the memory of an ultrasound instrument? a. pulser b. transducer c. receiver d. beam former e. digital scan converter f. displa...

What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B: Prolong the sonogram to make videos of the fetus for each fam...

Which of the following do the source and the medium determine? a. duty factor b. frequency c. propagation speed d. axial resolution correct answers d. Axial resolution is affected by all of the following EXCEPT a. frequency b. damping c. spatial pulse length d. focusing correct answer...

Sound waves are: correct answers longitudinal, mechanical The speed of sound in soft tissue is closest to: correct answers 1,500 m/s The frequency closest to the lower limit of ultrasound is: correct answers 15,000 Hz Which is not an acoustic variable? correct answers intensity The effec...

Sound waves are: a) electric b) mechanical, transverse c) spectral d) longitudinal, mechanical correct answers D The speed of sound of ultrasound in soft tissue is closest to: a) 1,540 km/sec b) 1.54 km/sec c) 1,500 m/s d) 1,540 mm/sec correct answers C Which is not an acoustic v...

The horizontal axis, or x-axis correct answers Runs side to side The vertical axis, or y-axis correct answers Runs up and down Unrelated correct answers Two items that are not associated Related or Proportional correct answers Two items that are associated or affiliated However, the relat...

What is frequency determined by? correct answers The source, thickness of piezoelectric element and propagation speed to a lesser degree Thicker element is equal to ________ frequencies correct answers Lower What is the reciprocal of frequency and what is the symbol correct answers Period, T ...

ultrasound imaging type in which pulses are reflected and used to produce a display correct answers pulsed wave brightness of the dots on image correct answers amplitude round-trip travel time per cm in soft tissue correct answers 13 microseconds A line produced on a display that represents...

When sound hits a boundary between two media of the same propagation speed at oblique incidence: correct answers no refraction will occur. Refraction requires the oblique incidence of sound across a boundary between two media with different propagation speeds. As transducer frequency increases...

In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... correct answers Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? correct answers 20-20,000Hz >20,000Hz=Ultrasound Frequency is measured in correct ...

13 microsecond rule correct answers the rule that states that it takes 13 microseconds for sound to travel 1 cm in soft tissue absorption correct answers the conversion of sound energy to heat acoustic cavitation correct answers the production of bubbles in a liquid medium acoustic speckle ...

frame correct answers One complete ultrasound image. The Far Zone. The area distal to the focal zone. Frequency The number of cycles per second. Measured in Hertz (Hz), kilohertz (kHz), or megahertz (MHz). A-mode correct answers Amplitude mode; the height of the spike on the image is rel...

Harmonics correct answers multiples of the transducer frequency, created in tissues , twice the frequency. Work b/c fundamental beam undergoes distortion. Improve spatial resolution (inversion). Non linear behavior creates harmonics. - HARMONICS = higher frequencies than the indecent frequency (over...