Spi Exam Review 2024 With 100% Correct Answers

Elevational resolution {Ans: Slice thickness artifact occurs when beam has a greater width than the reflector. *We assume the imaging plane is razor thin.}Shadowing artifact {Ans: US beam is unable to pass through a structure because the structure has a haigher than usual attenuation. An anechoic shadow occurs under structure covering all structures deeper.}Cross talk {Ans: found in doppler only *"doppler mirror" Caused by doppler gain set too high and incident angle near 90* when flow is at focus.}Pressure units: {Ans: Pascals}Six basic assumptions of imaging systems {Ans: 1. Sound travels in a straight line 2. Sound travels directly to a reflector and back 3. Sound travels exactly 1,540m/s 4. reflections arise from structures positioned along the beam's main axis. 5. intensity of the of the reflections is related to the scattering characteristics of the tissue. 6. The imaging plane is extremely thin.}What is a calorimeter? {Ans: A machine that can calculate total power of the beam measuring heat gain and the time itakes to obtain the heat.}