NO20081662L - Non-linear acoustic imaging, low-frequency manipulation of high-frequency scattering and propagation properties - Google Patents
Non-linear acoustic imaging, low-frequency manipulation of high-frequency scattering and propagation propertiesInfo
- Publication number
- NO20081662L NO20081662L NO20081662A NO20081662A NO20081662L NO 20081662 L NO20081662 L NO 20081662L NO 20081662 A NO20081662 A NO 20081662A NO 20081662 A NO20081662 A NO 20081662A NO 20081662 L NO20081662 L NO 20081662L
- Authority
- NO
- Norway
- Prior art keywords
- pulse
- imaging
- methods
- nonlinear
- propagation
- Prior art date
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Det er presentert nye metoder for akustisk avbildning som gir bilder med redusert reverberasjonsstøy og bilder av ulineær sprede- og forplantningsparametere til objektet, samt estimeringsmetoder for korreksjoner av bølgefrontaberrasjoner produsert av romlige variasjoner i den akustiske forplantningshastigheten. Metodene finner utnyttelse i en rekke anvendelser, for eksempel akustisk avbildning av geologiske strukturer, SONAR avbildning av undersjøiske objekter, medisinsk ultralyd avbildning, testing av modning av matvarer, og ikke-destruktiv testing av materialer. Metodene er basert på prosessering av det mottatte signal fra utsendte duale frekvensbånd akustiske pulskomplekser med overlappende høy- og lavfrekvente pulser. Den høyfrekvente pulsen benyttes til billedrekonstruksjon, og lavfrekvenspulsen benyttes til å manipulere ulineær sprednings- og/eller forplantningsegenskaper for den høyfrekvente pulsen. I en første metode benyttes det spredte signalet fra et enkelt dualbånd pulskompleks med filtrering i hurtig tid (dybdetid) for å gi et signal med undertrykkelse av reverberasjonsstøy med første harmonisk følsomhet og øket romlig oppløsning. I andre metoder sendes det ut to eller flere dualbånd pulskomplekser hvor frekvens og/eller fase og/eller amplitude til de lavfrekvente pulsene varierer for hvert utsendte pulskompleks. Ved filtrering langs pulstall koordinaten og korreksjon for ulineære propagasjonsforsinkelser og opsjonalt også amplituder, utvinner man et lineært tilbakespredningssignal med undertrykket pulsreverberasjonsstøy, et ulineært tilbakespredningssignal, og kvantitative ulineære propagasjons- og spredeparametere. De reverberasjonsundertrykte signalene er videre nyttige for estimering av bølgefrontaberrasjonene, og det er gitt approksimative estimater for aberrasjonskorreksjonene. Metodene er videre nyttige ved brede senderstråler med multiple parallelle mottagerstråler for å øke billedraten ved 2D og 3D avbildning. Det ulineære signalet er nyttig for avbildning av forskjeller i objektegenskaper, mikrokalsifiseringer, innvekst av fibrøst vev eller skumceller, eller mikrogassbobler som man finner ved dekompresjon eller injisert som ultralyd kontrastmidler. Metodene er også nyttige ved transmisjonsavbildning for å gi målte data for tomografisk og diffraksjonstomografisk billedrekonstruksjon.New methods for acoustic imaging have been presented that provide images with reduced reverberation noise and images of nonlinear scattering and propagation parameters to the object, as well as estimation methods for corrections of wavefront aberrations produced by spatial variations in the acoustic propagation rate. The methods are utilized in a variety of applications, such as acoustic imaging of geological structures, SONAR imaging of subsea objects, medical ultrasound imaging, food maturation testing, and nondestructive testing of materials. The methods are based on processing the received signal from transmitted dual frequency bands acoustic pulse complexes with overlapping high and low frequency pulses. The high frequency pulse is used for image reconstruction, and the low frequency pulse is used to manipulate nonlinear scattering and / or propagation properties of the high frequency pulse. In a first method, the scattered signal from a single dual band pulse complex is used with fast time filtering (depth time) to produce a signal with suppression of reverberation noise with first harmonic sensitivity and increased spatial resolution. In other methods, two or more dual band pulse complexes are transmitted where frequency and / or phase and / or amplitude of the low frequency pulses vary for each transmitted pulse complex. By filtering along the pulse number coordinate and correction for nonlinear propagation delays and optionally also amplitudes, a linear backscatter signal with suppressed pulse reversal noise, a nonlinear backscatter signal, and quantitative nonlinear propagation and scatter parameters is obtained. The reverberation suppressed signals are further useful for estimating the wavefront aberrations, and approximate estimates for the aberration corrections have been provided. The methods are further useful for wide transmitter beams with multiple parallel receiver beams to increase the frame rate at 2D and 3D imaging. The nonlinear signal is useful for imaging differences in object properties, microcalcifications, fibrous tissue or foam cell growth, or micro gas bubbles found by decompression or injected as ultrasonic contrast agents. The methods are also useful in transmission imaging to provide measured data for tomographic and diffraction tomographic image reconstruction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20081662A NO20081662L (en) | 2005-09-08 | 2008-04-03 | Non-linear acoustic imaging, low-frequency manipulation of high-frequency scattering and propagation properties |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/NO2005/000323 WO2007030016A1 (en) | 2005-09-08 | 2005-09-08 | Acoustic imaging by nonlinear low frequency manipulation of high frequency scattering and propagation properties |
NO20081662A NO20081662L (en) | 2005-09-08 | 2008-04-03 | Non-linear acoustic imaging, low-frequency manipulation of high-frequency scattering and propagation properties |
Publications (1)
Publication Number | Publication Date |
---|---|
NO20081662L true NO20081662L (en) | 2008-06-06 |
Family
ID=40020148
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NO20081662A NO20081662L (en) | 2005-09-08 | 2008-04-03 | Non-linear acoustic imaging, low-frequency manipulation of high-frequency scattering and propagation properties |
Country Status (1)
Country | Link |
---|---|
NO (1) | NO20081662L (en) |
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2008
- 2008-04-03 NO NO20081662A patent/NO20081662L/en not_active Application Discontinuation
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