Spatial and temporal aberrator stability for real-time adaptive imaging

Reported real-time adaptive imaging systems use near-field phase correction techniques, which are desired because of their simple implementation and their compatibility with current system architectures. Aberrator stability is important to adaptive imaging because it defines the spatial and temporal...

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Veröffentlicht in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control Jg. 52; H. 9; S. 1504 - 1517
Hauptverfasser: Dahl, J.J., Soo, M.S., Trahey, G.E.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY IEEE 01.09.2005
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Aberration
Acoustic imaging
Acoustics
Adaptive systems
Algorithms
Animals
Array signal processing
Biological and medical sciences
Biomedical imaging
Breast
Computer Systems
Correlation
Delay effects
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
General equipment and techniques
High-resolution imaging
Humans
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Imaging
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Investigative techniques, diagnostic techniques (general aspects)
Liver
Medical sciences
Miscellaneous. Technology
Phantoms, Imaging
Physics
Real time
Real time systems
Reproducibility of Results
Sensitivity and Specificity
Stability
Temporal logic
Transducers
Ultrasonic investigative techniques
Ultrasonics, quantum acoustics, and physical effects of sound
Ultrasonography - instrumentation
Ultrasonography - methods
Near field
Human
System architecture
Liver
Experimental study
Real time
Modeling
Real time system
Beam forming
Tissue
Cross correlation
Temporal study
Breast
Mammary gland
Sampling
Acoustic image
ISSN:0885-3010, 1525-8955
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Zusammenfassung:Reported real-time adaptive imaging systems use near-field phase correction techniques, which are desired because of their simple implementation and their compatibility with current system architectures. Aberrator stability is important to adaptive imaging because it defines the spatial and temporal limits for which the near-field phase estimates are valid. Spatial aberrator stability determines the required spatial sampling of the aberrator, and temporal aberrator stability determines the length of time for which the aberration profile can be used. In this study, the spatial and temporal stability of clinically measured aberrations is reported for breast, liver, and thyroid tissue. Cross correlations between aberration estimates revealed aberrators to have azimuthal isoplanatic patch sizes of 0.44, 0.28, and 0.20 mm for breast, liver, and thyroid tissue, respectively, at 80% correlation. Axial isoplanatic patch sizes were 1.26, 0.76, and 1.80 mm for the same tissue, respectively, at 80% correlation. Temporal stability at 80% correlation was determined to be greater than 1.5 seconds for breast and thyroid tissue, and 0.65 seconds for the liver. The effects of noise, motion, and target nonuniformity on aberrator stability are characterized by simulations and experiments in tissue mimicking phantoms.
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ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2005.1516023