SPI TESTS COMPILATION BUNDLE

The doppler effect is observed as a change in ________ and has units of _________. CORRECT ANSWERS: Frequence, per second In clinical imaging, which reflectors produce most relevant Doppler shifts? CORRECT ANSWERS: Red blood cells If red blood cells are traveling TOWARD a trasducer, the F em...

frequency and period CORRECT ANSWERS: inverse stiffness and propagation speed CORRECT ANSWERS: direct density and propagation speed CORRECT ANSWERS: inverse frequency and wavelength CORRECT ANSWERS: inverse power and amplitude CORRECT ANSWERS: direct proportional to amplitude squ...

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 increas...

what is an artifact CORRECT ANSWERS: echo that do not correspond actual with anatomy, not in right location, size or shape, Too bright or dark, missing from image completely. propagation artifacts CORRECT ANSWERS: occur due to bending (refraction), redirection (reflection) or reverberation of s...

1. The term Anechoic in relation to a sonographic image means? A. structure that appears lighter than the surrounding structures B. The absence of echos C. A structure that appears the same as surrounding structures D. A structure that reflects 100% of the sound wave CORRECT ANSWERS: B. The abs...

Doppler Shift CORRECT ANSWERS: Doppler Frequency - A change or variation in the frequency of sound as a result of motion between the sound source & the receiver. = received frequency - transmitted frequencies Positive Doppler Shift CORRECT ANSWERS: Reflected frequency is higher than transmitt...

Absorption CORRECT ANSWERS: The conversion of sound energy to heat Acoustic speckle CORRECT ANSWERS: The interference pattern caused by scatters and produces the granular appearance of tissue on a sonographic image Amplitude CORRECT ANSWERS: The maximum or minimum deviation of an acoustic v...

Electronic pulses from the pulser are applied to the CORRECT ANSWERS: Transducer Which of the following is performed by the receiver CORRECT ANSWERS: Amplification, compensation, compression, demodulation The dynamic range of ultrasound system is defined as CORRECT ANSWERS: The ratio of the...

Sensitivity CORRECT ANSWERS: ability of a test to detect disease when it IS present Specificity CORRECT ANSWERS: ability of a test to rule out disease when it is NOT present Positive Predictive Value (PPV) CORRECT ANSWERS: Calculates how often a positive study is correctly diagnosed: abilit...

Which of the following is used to eliminate the low-frequency signals that appear as noise as a result of wall/valve motion? A. High-pass filter B. Bass-thump filter C. Low-pass filter D. High-frequency filter CORRECT ANSWERS: A. High-pass filter AKA wall filter AKA wall-thump filter Acco...

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. disp...

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 COR...

What is dynamic aperture? A.aperture that varies with transmit frequency B.aperture that decreases as a function of time C.aperture that increases with increasing focal length D.aperture that changes as a function of frame rate CORRECT ANSWERS: C to which acoustic variable is penetration dep...

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, t...

Which artifact is illustrated by this image? CORRECT ANSWERS: a) Shadowing b) Side Lobe c) Reverberation d) Mirroring What is increased if the pulse duration is decreased? CORRECT ANSWERS: a) Bandwidth b) Line Density c) Frame Rate d) Duty Factor What is the most appropriate action fo...