title: A graphical description of scattering.
abstract: The relationship between Fourier transforms of the refractive index of objects and the Fourier transform of the scattered ultrasonic waves are reviewed. Both the Born and Rytov approximations in the first order are used to linearize the Helmholtz wave equation. Both forward and backward scatter geometries are illustrated. The relationship between these coherent wave considerations and the clinically used echo and transmission modalities is discussed.
mesh_terms: D005583:Fourier Analysis; D008433:Mathematics; D012542:Scattering, Radiation; D014054:Tomography; D014465:Ultrasonics