Title :
A phase aberration correction method for ultrasound imaging
Author :
Karaman, Mustafa ; Atalar, Abdullah ; Köymen, Hayrettin ; O´Donnell, Matthew
Author_Institution :
Dept. of Electr. & Electron. Eng., Bilkent Univ., Ankara, Turkey
fDate :
7/1/1993 12:00:00 AM
Abstract :
A computationally efficient method for phase aberration correction in ultrasound imaging is presented. The method is based on time delay estimation via minimization of the sum of absolute differences between radio frequency samples of adjacent array elements. Effects of averaging estimated aberration patterns over scan angle and truncation to a single bit wordlength are examined. Phase distortions due to near-field inhomogeneities are simulated using silicone rubber aberrators. Performance of the method is tested using experimental data. Simulation studies addressing different factors affecting efficiency of the method, such as the number of iterations, window length, and the number of scan angles used for averaging, are presented. Images of a standard resolution phantom are reconstructed and used for qualitative testing.<>
Keywords :
acoustic imaging; acoustic signal processing; array signal processing; biomedical ultrasonics; image reconstruction; medical image processing; minimisation; RF echo signals sampling; averaging; beamforming; image reconstruction; medical imaging; minimization; near-field inhomogeneities; number of iterations; optimal imaging; phase aberration correction method; phase distortions; phased array images; scan angle; silicone rubber aberrators; simulation studies; single bit wordlength; standard resolution phantom; time delay estimation; tissue phantoms; truncation; ultrasound imaging; window length; Delay effects; Delay estimation; Frequency estimation; Image resolution; Minimization methods; Phase distortion; Radio frequency; Rubber; Testing; Ultrasonic imaging;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
