Spatial and temporal aberrator stability for real-time adaptive imaging.
Journal Article
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.
Full Text
Duke Authors
Cited Authors
- Dahl, JJ; Soo, MS; Trahey, GE
Published Date
- September 2005
Published In
Volume / Issue
- 52 / 9
Start / End Page
- 1504 - 1517
PubMed ID
- 16285449
Pubmed Central ID
- 16285449
International Standard Serial Number (ISSN)
- 0885-3010
Digital Object Identifier (DOI)
- 10.1109/tuffc.2005.1516023
Language
- eng
Conference Location
- United States