Refraction


 * Reference for term: Musculoskeletal ultrasound - Holsbeeck Van, M. et al.
 * Artefact depicting real structures in a false location.
 * Reference for definition: Musculoskeletal Ultrasound - Holsbeeck Van, M. et al.
 * Comment: Refraction occurs when an ultrasound beam enters one medium from another, both with differing acoustic velocity, which results in a bending or deviation of the ultrasound beam from the expected straight-line path.