Kaupang, HVarslot, TrondMasoy, Svein-Erik2015-12-10December 2http://hdl.handle.net/1885/57393A simulation study is performed to present results concerning 3D aberration correction for harmonic imaging. Two different correction schemes (a pure time-delay correction and a time-delay and amplitude correction) are employed along with estimation based on either the received first- or second-harmonic frequency. An aberrating body wall is implemented as a 20 mm delay-screen body wall using eight screens, and is tuned to match human abdominal wall characteristics. The transmit pressure of the first harmonic is set to not succeed a mechanical index of 1.1 for the uncorrected case and a pure time-delay correction. Using a time-delay and amplitude correction, the total acoustic energy transmitted is equal to that of the uncorrected case. The total amount of generated second-harmonic energy increases with approximately 1 dB for a pure time-delay correction and about 2 dB for a time-delay and amplitude correction, both estimated at the received first-harmonic frequency. The general side-lobe level of the first- and second-harmonic focal point beam profile averaged over circles around the transducer axis is lowered with 2-10 dB for both correction schemes relative to the uncorrected case.Keywords: Aberrations; Computerized tomography; Estimation; Frequency estimation; Optical properties; Time delay; Ultrasonics; Walls (structural partitions); Aberration corrections; Acoustic energy; Amplitude corrections; Beam profiling; Body walls; Correction sche200710.1109/ULTSYM.2007.3872015-12-09