SPI Practice Questions #1 WITH COMPLETE SOLUTIONS

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 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 CORRECT ANSWERS: 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 CORRECT ANSWERS: 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 CORRECT ANSWERS: C. Receiver amplification 5. Of the following, what is produced by low attenuation? A. Shadowing B. Refraction C. Enhancement D. Reflection CORRECT ANSWERS: C. Enhancement