Recursive ultrasound imaging

Jørgen Arendt Jensen (Inventor), Svetoslav Nikolov (Inventor)

Research output: Patent

487 Downloads (Pure)

Abstract

A method and an apparatus for recursive ultrasound imaging is presented. The method uses a Synthetic Transmit Aperture, but unlike previous approaches a new frame is created at every pulse emission. In receive, parallel beam forming is implemented. The beam formed RF data is added to the previously created RF lines. To keep the level of the signal, the RF data obtained previously, when emitting with the same element is subtracted from the RF lines. Up to 5000 frames/sec can be achieved for a tissue depth of 15 cm with a speed of sound of c = 1540 m/s. The high frame rate makes continuous imaging data possible, which can significantly enhance flow imaging. A point spread function 2° wide at -6 dB and grating lobes of $m(F) -50 dB is obtained with a 64 elements phased array with a central frequency ƒ¿0? = 3 MHz using a sparse transmit aperture using only 10 elements (N¿xmt? = 10) during pulse emission. The corresponding images have the quality of a dynamically focused image in transmit and receive. The dynamic focusing gives a small sampling volume and the capability to view small blood vessels and obtain the velocity profiles within the vessels with lower variance than with normal imaging.
Original languageEnglish
IPCG01S15/89; G01S7/52; (IPC1-7): G01S15/89; G01S7/52; G10K11/34
Patent numberWO0068931
Filing date16/11/2000
CountryInternational Bureau of the World Intellectual Property Organization (WIPO)
Priority date05/10/1999
Priority numberDK19990000635
Publication statusPublished - 2000

Bibliographical note

Also published as: US6689063 (B1), EP1194920 (A1), EP1194920 (B1), DE60003927 (T2), AU4393400 (A), AT245301 (T).

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