Title :
Spatial and temporal stability of tissue induced aberration [biomedical ultrasound imaging]
Author :
Dahl, Jeremy J. ; Soo, Mary S. ; Trahey, Gregg E.
Author_Institution :
Dept. of Biomed. Eng., Duke Univ., Durham, NC, USA
Abstract :
Real-time adaptive imaging systems employ nearfield phase correction techniques, which are desired because of their computational simplicity and compatibility with current imaging system architectures. Aberrator stability is essential to adaptive imaging because it defines the spatial and temporal limits for which the near-field phase estimates are valid. In this study, the spatial and temporal stability of clinical aberrations is measured in breast, liver, and thyroid tissue and discussed in relation to real-time adaptive imaging. Azimuthal isoplanatic patch sizes of 1.1, 0.44, and 1.0 mm were measured for breast, liver, and thyroid tissue, respectively, using a 70% correlation limit. Axial isoplanatic patch sizes were 2.0, 1.2, and 2.9 mm for the same tissue, respectively. Temporal stability was determined to be greater than 1.5 seconds for breast and thyroid tissue, and 1.2 seconds in the liver. The effects of noise, motion, and target non-uniformity on aberrator stability are characterized with simulations and experiments in tissue mimicking phantoms.
Keywords :
adaptive signal processing; biomedical ultrasonics; error correction; phantoms; stability; 0.44 mm; 1.0 mm; 1.1 mm; 1.2 mm; 1.2 s; 1.5 s; 2.0 mm; 2.9 mm; aberration spatial stability; aberration temporal stability; aberrator stability; azimuthal isoplanatic patch size; biomedical ultrasound imaging; breast tissue; clinical aberrations; correlation limit; liver tissue; near-field phase correction; real-time adaptive imaging systems; thyroid tissue; tissue induced aberration; tissue mimicking phantoms; Adaptive systems; Biomedical computing; Biomedical imaging; Biomedical measurements; Breast; Computer architecture; Liver; Real time systems; Stability; Ultrasonic imaging;
Conference_Titel :
Ultrasonics Symposium, 2004 IEEE
Print_ISBN :
0-7803-8412-1
DOI :
10.1109/ULTSYM.2004.1417707
