Adaptive imaging and spatial compounding in the presence of aberration

Spatial compounding reduces speckle and increases image contrast by incoherently averaging images acquired at different viewing angles. Adaptive imaging improves contrast and resolution by compensating for tissue-induced phase errors. Aberrator strength and spatial frequency content markedly impact...

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Vydané v:IEEE transactions on ultrasonics, ferroelectrics, and frequency control Ročník 52; číslo 7; s. 1131 - 1144
Hlavní autori: Dahl, J.J., Guenther, D.A., Trahey, G.E.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: New York, NY IEEE 01.07.2005
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:
Aberration
Acoustics
Algorithms
Compounding
Cysts - diagnostic imaging
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Humans
Image contrast
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Image quality
Image resolution
Image restoration
Imaging
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Lesions
Phase detection
Phase frequency detector
Physics
Reproducibility of Results
Sensitivity and Specificity
Signal restoration
Signal to noise ratio
Spatial resolution
Speckle
Strength
Thyroid Gland - diagnostic imaging
Transducers
Ultrasonics, quantum acoustics, and physical effects of sound
Ultrasonography - methods
Human
Averaging method
Image processing
Noise reduction
Performance characteristic
Speckle
Image restoration
Image frequency
Image method
Image quality
Multiple view
Spatial frequency
Tissue
Cyst
Lesion
High frequency
Image contrast
Signal to noise ratio
ISSN:0885-3010, 1525-8955
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Popis
Shrnutí:Spatial compounding reduces speckle and increases image contrast by incoherently averaging images acquired at different viewing angles. Adaptive imaging improves contrast and resolution by compensating for tissue-induced phase errors. Aberrator strength and spatial frequency content markedly impact the desirable operating characteristics and performance of these methods for improving image quality. Adaptive imaging, receive-spatial compounding, and a combination of these two methods are presented in contrast and resolution tasks under various aberration characteristics. All three imaging methods yield increases in the contrast-to-noise ratio (CNR) of anechoic cysts; however, the improvements vary depending on the properties of the aberrating layer. Phase correction restores image spatial frequencies, and the addition of compounding opposes the restoration of image spatial frequencies. Lesion signal-to-noise ratio (SNR), an image quality metric for predicting lesion detectability, shows that combining spatial compounding with phase correction yields the maximum detectability when the aberrator strength or spatial frequency content is high. Examples of these modes are presented in thyroid tissue.
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ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2005.1503999