Title :
Fourier f-k migration for plane wave ultrasound imaging: Theoretical framework
Author :
Le Tarnec, Louis ; Muth, S. ; Montagnon, Emmanuel ; Poree, Jonathan ; Cloutier, Guy ; Garcia, D.
Abstract :
Ultrafast ultrasound is an emerging modality that offers new perspectives and opportunities in medical imaging. Plane wave imaging (PWI) allows one to attain very high frame rates by transmission of planar ultrasound wavefronts. As a plane wave reaches a given scatterer, the latter becomes a secondary source emitting spherical waves and creating a diffraction hyperbola. To produce an image of the scatterers, all the hyperbolas must be migrated back to their apexes. In order to perform efficient PWI migration while keeping high-quality images at high frame rates, we propose a migration method carried out in the frequency-wavenumber (f-k) domain. The f-k migration for PWI has been adapted from the Stolt migration for seismic imaging. This migration technique is based on the exploding reflector model (ERM), which consists in assuming that all the scatterers explode simultaneously and become acoustic sources. The classical ERM model, however, is not appropriate for PWI. We proved that the ERM can be made suitable for PWI by a spatial transformation of the hyperbolic signatures present in the radio-frequency data.
Keywords :
acoustic radiators; biomedical ultrasonics; fast Fourier transforms; high-speed techniques; ultrasonic diffraction; ultrasonic scattering; Fourier f-k migration; PWI migration; Stolt migration; acoustic sources; classical ERM model; diffraction hyperbola; exploding reflector model; frequency-wavenumber domain; high frame rate; high-quality image; hyperbolic signature; medical imaging; migration technique; planar ultrasound wavefront transmission; plane wave ultrasound imaging; radio-frequency data; scatterer image; secondary source; seismic imaging; spatial transformation; spherical wave; ultrafast ultrasound; Acoustics; Equations; Imaging; Mathematical model; RF signals; Radio frequency; Ultrasonic imaging; Fast Fourier Transforms; Plane wave imaging; Stolt Migration; Ultrasound imaging;
Conference_Titel :
Ultrasonics Symposium (IUS), 2012 IEEE International
Conference_Location :
Dresden
Print_ISBN :
978-1-4673-4561-3
DOI :
10.1109/ULTSYM.2012.0534