Acoustic wave propagation is inherently nonlinear. This causes a deformation of a propagating pressure pulse, and leads to higher harmonics of the emitted spectrum. Being avoided in the past, nowadays the second harmonic is used in diagnostic ultrasound to improve resolution and reduce artifacts. This paper shows how the improvements can be explained from the properties of the higher harmonics in a nonlinear ultrasound beam. Moreover, it is outlined how the idea of second harmonic imaging may be extended towards higher harmonic imaging. Finally, the paper presents the Iterative Nonlinear Contrast Source method, which is developed for the accurate computation of the higher harmonics in pulsed ultrasound beams.
|Title of host publication||Proceedings of the 2012 International Conference on Electromagnetics in Advanced Applications, ICEAA'12|
|Place of Publication||Piscataway|
|Publication status||Published - 2012|
|Event||2012 14th International Conference on Electromagnetics in Advanced Applications, ICEAA 2012 - Cape Town, South Africa|
Duration: 2 Sep 2012 → 7 Sep 2012
|Conference||2012 14th International Conference on Electromagnetics in Advanced Applications, ICEAA 2012|
|Period||2/09/12 → 7/09/12|