Noise Reduction Using Spatial-Angular Compounding for Elastography

Ultrasound elastography has developed into an imaging modality suitable for detection and diagnosis of cancers in the breast, prostate, and thyroid and for monitoring ablative therapies in the liver, kidneys, and other sites. In this article, a new approach is described that enables the reduction of...

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Vydáno v:IEEE transactions on ultrasonics, ferroelectrics, and frequency control Ročník 51; číslo 5; s. 510 - 520
Hlavní autoři: Techavipoo, U., Quan Chen, Varghese, T., Zagzebski, J.A., Madsen, E.L.
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York, NY Institute of Electrical and Electronics Engineers 01.05.2004
Témata:
Acoustics
Algorithms
Breast - physiology
Compressive Strength - physiology
Elasticity
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Humans
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Phantoms, Imaging
Physical Stimulation - instrumentation
Physical Stimulation - methods
Physics
Reproducibility of Results
Scattering, Radiation
Sensitivity and Specificity
Stochastic Processes
Transducers
Ultrasonics, quantum acoustics, and physical effects of sound
Ultrasonography - instrumentation
Ultrasonography - methods
Ultrasonography, Mammary - instrumentation
Ultrasonography, Mammary - methods
Human
Compression
Noise reduction
Liver
Mechanical properties
Malignant tumor
Experimental study
Male genital system
Noise control
Strain tensor
Multiple view
Tissue
Breast
Medical imagery
Diagnosis
Mammary gland
Acoustic image
Prostate
Spatial resolution
Elastography
Monitoring
Signal to noise ratio
ISSN:0885-3010
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Popis
Shrnutí:Ultrasound elastography has developed into an imaging modality suitable for detection and diagnosis of cancers in the breast, prostate, and thyroid and for monitoring ablative therapies in the liver, kidneys, and other sites. In this article, a new approach is described that enables the reduction of noise artifacts in elastography without a significant reduction in either the contrast or spatial resolution. The technique uses angular-weighted compounding of local angular strains estimated from echo signals scanned at different insonification angles. Strain estimated along angular insonification directions can be separated into strain tensor components along the axial (direction of compression) and lateral directions. The mechanical stimulus is applied only along one direction. Angular-weighting factors are derived from the relationship between the axial and lateral strains under the assumption of tissue incompressibility. Experimental results using a uniformly elastic, tissue-mimicking phantom demonstrate the improvement in the signal-to-noise ratio obtained with angular-weighted compounding. Variation in the signal-to-noise ratio obtained using different angular increments also is investigated. Elastograms obtained from an inclusion phantom also demonstrate the improvement in contrast detail resolution obtained using spatial-angular compounding.
Bibliografie:ObjectType-Article-2
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ISSN:0885-3010
DOI:10.1109/TUFFC.2004.1308687