Welcome to Center for Fast Ultrasound Imaging (CFU)
At CFU, we research in advanced digital ultrasound systems for anatomic imaging and flow imaging.
On this website, you will find information on all current research projects, our facilities, the people involved, and publications since the center was established in 1998.
CFU cooperates closely with BK Medical and Copenhagen University Hospital and 11 PhD students are currently affiliated with the center.
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Article of the Week
Ultrasound pulse-echo measurements on rough surfaces with linear array transducers
Despite being easy, quick, portable and safe, ultrasound imaging suffers from a number of artefacts. One is that the images are angle-dependent due to the angle-dependence of the echoes received from interfaces larger than the wavelength of the ultrasound energy emitted.
We have previously studied the influence of roughness, angle and range between transducer and interface as well as transducer type on the echo signal from planar interfaces for a number of different single-element transducers - in the present study, the same effects have been studied quantitatively for a linear array transducer on a commercially available ultrasound scanner at two different frequencies.
Measurements from the smooth surface show a high degree of angle-dependence with a span of 18 dB in the angle range. Surfaces with a roughness smaller than the wavelength also show some angle-dependence, whereas surfaces with roughness comparable to or larger than the wavelength show virtually no angle-dependence with a span of only 2 dB in the angle range. Measurements with linear array transducers are less dependent on the angle than measurements with single-element focused transducers.
Measurement setup seen from above. Transducer placed in the middle of the image with angled phantom below.
Sjøj, Sidsel M. N.; Blanco, Esther N.; Wilhjelm, Jens E.; Jensen, Henrik; Hemmsen, Martin Christian; Jensen, Jørgen Arendt
Presented at: ICU International Congress on Ultrasonics. Gdansk, Poland, 2011
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