ULTRASOUND PHYSICS SPI REVIEW BOARD EVALUATION SCRIPT 2026 QUESTIONS WITH SOLUTIONS GRADED A+

ULTRASOUND PHYSICS SPI REVIEW
BOARD EVALUATION SCRIPT 2026
QUESTIONS WITH SOLUTIONS GRADED A+

⩥ artifact seen with gas. Answer: ring down artifact
- "dirty shadowing"


⩥ Ring down artifact:. Answer: Fluid trapped between a tetrahedron (a
"ring") of air bubbles
- Parallel band extending posterior to a collection of gas


⩥ Mirror image artifact:. Answer: Highly reflective surface in the path
of beam
- Beam is repeatedly reflected and trapped behind strong reflector


⩥ artifact seen at the liver/diaphgram surface. Answer: mirror image
artifact


⩥ what are some artifacts related to velocity errors? (2). Answer: - speed
displacement artifact
- refraction artifact

, * violates the assumption that speed of sound is 1540 m/s in human
tissue
- if speed is slower in tissue, machine thinks depth is more


⩥ discontinuous and focally displaced liver border = what artifact.
Answer: Speed Displacement artifact


⩥ Speed Displacement artifact:
- what is it due to. Answer: Speed of sound slows down in fat, relative to
liver
- Beam takes longer to return and is perceived to be farther away


⩥ Duplicated SMA sign = which artifact. Answer: Refraction Artifact


⩥ Refraction artifact:
- what assumption does it violate?
- what are three appearances this can cause?. Answer: Violates idea that
beam is going straight


Speed difference in tissues can cause:
- object to appear wider
- object to be misplaced
- object to be duplicated