SPI Practice Questions #1, All Quizzes and answers. 100% Accurate. Graded A+.

SPI Practice Questions #1, All Quizzes and answers. 100% Accurate. Graded A+. B. The absence of echos Question 1 Explanation: An (without) echoic (producing echoes) - 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 C.The system with the larger diameter crystal. - 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 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. LoC. 100 mW/cm2 D. 1 mW/cm2 C. Receiver amplification - 4. Brightness of the display is affected by? A. Dynamic Range B. Contrast C. Receiver amplification D. Echo length C. Enhancement - 5. Of the following, what is produced by low attenuation? A. Shadowing B. Refraction C. Enhancement D. Reflection C. Decreasing. - 6. Negative decibels show that the intensity is what? A. Halved. B. Increasing. C. Decreasing. D. Stays the same. A. Pulse length Question 7 Explanation: Axial Resolution = Spatial Pulse Length - 7. Artifacts associated with axial resolution are the result of what? A. Pulse length B. Multiple reflections C. Attenuation D. Beam width 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. - 8. Spectral analysis is done by? A. Demodulation B. Smoothing C. Rectification D. Correlation Function 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. - 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. B... can be lethal to living things. - 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. Lateral resolution Question 11 Explanation: LATA= higher numerical value LARD = smaller value - 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. 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. - 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. Decreases. - 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. D. Reduced absorption. - 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. C. When the imaged structure has a non-uniform, uneven appearance Question 15 Explanation