SPI Practice Questions 1 Latest 2023 Graded A

SPI Practice Questions 1 Latest 2023 Graded A 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 t ...

SPI Practice Questions 1 Latest 2023 Graded A 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 ✔✔B. The absence of echos Question 1 Explanation: An (without) echoic (producing echoes) 2. If you have two near identical systems with different diameter piezoelectric crystals in the transducer which system will have the farthest focus? A. The focus depth is not dependent on the diameter of the crystal. B. The system with the smaller diameter crystal. C. The system with the larger diameter crystal. D. The focus will be the same ✔✔C.The system with the larger diameter crystal. 3. What is the upper limit intensity for the SPTA of a focused ultrasound wave with no observed bio-effects? A. 1 W/cm2 B. 10 W/cm2 C. 100 mW/cm2 D. 1 mW/cm2 ✔✔A. 1 W/cm2 Question 3 Explanation: Bioeffects intensity limit: SPTA >100 mW/cm2 Unfocused >1 W/cm2 or 1000 mW/cm2 Focused Exam duration has the greatest effect on patient exposure. HIGHEST output intensities used with pulsed doppler. Lowest output intensities are with gray-scale imaging. 4. Brightness of the display is affected by? A. Dynamic Range B. Contrast C. Receiver amplification D. Echo length ✔✔C. Receiver amplification 5. Of the following, what is produced by low attenuation? A. Shadowing B. Refraction C. Enhancement D. Reflection ✔✔C. Enhancement 6. Negative decibels show that the intensity is what? A. Halved. B. Increasing. C. Decreasing. D. Stays the same. ✔✔C. Decreasing. 7. Artifacts associated with axial resolution are the result of what? A. Pulse length B. Multiple reflections C. Attenuation D. Beam width ✔✔A. Pulse length Question 7 Explanation: Axial Resolution = Spatial Pulse Length 8. Spectral analysis is done by? A. Demodulation B. Smoothing C. Rectification D. Correlation Function ✔✔D. Correlation Function Question 8 Explanation: Also known as Autocorrelation. It is like finding the average shape between a square and a triangle. It has to find something in between. It takes many signals that are different and finds what's similar. Finds the average. 9. Side lobe artifact is a result of what condition? A. The bending of the sound beam. B. Unexpected change in attenuation. C. Linear transducer array characteristics. D. Acoustic energy radiating in a direction different than the main axis of the beam. ✔✔D. Acoustic energy radiating in a direction different than the main axis of the beam. Question 9 Explanation: It's like a flashlight in the dark. Your beam lights up what's in front of you but some light does go off axis and light up what's around you. 10. "According to research it is indicated that cavitation ______? A... effects are purely theoretical. B... can be lethal to living things. C... never occurs. D... cannot occur with short pulses. ✔✔B... can be lethal to living things. 11. In standard diagnostic imaging instrumentation, which has the higher numerical value? A. Both have the same value B. Lateral resolution C. Neither, they have no numerical values D. Longitudinal resolution ✔✔B. Lateral resolution Question 11 Explanation: LATA= higher numerical value LARD = smaller value 12. What will change as you increase the maximum imaging depth? A. Wavelength B. Pulse Repetition Frequency (PRF) C. Frequency D. Pulse Duration (PD) ✔✔B. Pulse Repetition Frequency (PRF) Question 12 Explanation: Pulse Repetition Frequency (PRF) decreases with depth PRF and depth are inversely related. As you image deeper the machine has to listen longer so it will pulse less frequently. 13. What effect does lowering the frequency have on temporal resolution? A. Stays the same. B. Decreases. C. Frequency and temporal resolution are not related. D. Increases. ✔✔B. Decreases. 14. A great benefit to a low frequency transducer is what? A. A longer Spatial Pulse Length (SPL) B. Shorter wavelength C. Better Axial Resolution D. Reduced absorption. ✔✔D. Reduced absorption. 15. The term Heterogeneous in relation to a sonographic image means? A. When the imaged structure has a smooth, even appearance B. A structure that appears lighter than the surrounding structures C. When the imaged structure has a non-uniform, uneven appearance D. A structure that appears darker than the surrounding structures ✔✔C. When the imaged structure has a non-uniform, uneven appearance Question 15 Explanation: The prefix Hetero- means "different". Also described as Inhomogeneous In (not) homo (the same) geneous (composition) 16. For reverberation artifact to occur what conditions have to be met? A. The sound wave must transmit through a higher impedance to a lower impedance B. Two or more strong reflectors must be parallel to the beam C. The beam must travel from a low impedance to a high impedance D. Two or more strong reflectors must be perpendicular to the beam ✔✔B. Two or more strong reflectors must be parallel to the beam Question 16 Explanation: I imagine this like throwing a ball down the hall way. If you throw it down the hallway it travels in a straight line. But if you throw it at the wall (strong reflector) it will bounce and hit the other wall (strong reflector) and bounce back and forth. This is reverberation. 17. Spectral analysis is done by? A. Smoothing B. Demodulation C. Autocorrelation D. Rectification ✔✔C. Autocorrelation Question 17 Explanation: Autocorrelation is like finding the average shape between a square and a triangle. It has to find something in between. It takes many signals that are different and finds what's similar. Finds the average. 18. Brightness of the display is affected by? A. Demodulation. B. Echo length, receiver amplification and actual contrast setting of the display. C. Dynamic Range. D. Echo intensity, receiver amplification and actual brightness setting of the display. ✔✔D. Echo intensity, receiver amplification and actual brightness setting of the display. 19. For every 10dB the intensity will what? A. Increase 100x B. Increase tenfold C. Increase by 1/2 D. Decrease 10x ✔✔B. Increase tenfold 20. A side lobe artifact arises from what fact? A. The Ultrasound system assumes all reflections arise from the same depth. B. The Ultrasound system assumes all reflections arise from the same impedance. C. The Ultrasound system assumes all reflections arise from the same beam D. The Ultrasound system assumes all reflections arise from the same reflection Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results ✔✔C. The Ultrasound system assumes all reflections arise from the same beam Question 20 Explanation: An ultrasound system in a perfect world would create a single beam. In reality that beam transmits in all directions not just a straight line so you end up with reflections coming from angles that aren't necessarily where the original beam was aimed.