2D and 3D High Frame Rate Imaging with Limited Diffraction Beams

  • Lu J
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A new 2D (two-dimensional) and 3D (three-dimensional) pulse-echo
imaging method (Fourier method) has been developed with limited
diffraction beams. In this method, a plane wave pulse (broadband) is
used to transmit and limited diffraction beams of different parameters
are used to receive. Signals received are processed to obtain spatial
Fourier transform of object functions and images are constructed with an
inverse Fourier transform. Because only one transmission is required to
construct images, this method may achieve a high frame rate (up to 3750
frames/s for biological soft tissues at a depth of 200 mm). To
demonstrate the efficacy of the method, both 2D C-mode and 3D images
have been simulated using conditions that are typical for medical
ultrasound. Results show that images of high resolutions (about 6
wavelengths at 200 mm) and low sidelobes (around -60 dB) can be
constructed over a large depth of interest (30 to 200 mm) with a 50 mm
diameter aperture. Experiments with the new method have also been
carried out. 2D B-mode images have been constructed with conventional
linear arrays. In the experiment, an ATS 539 tissue-equivalent phantom
and two linear arrays were used. The first array had a center frequency
of 2.25 MHz, dimension of 18.288 mm××12.192 mm, and 48
elements. The second had a center frequency of 2.5 MHz, 38.4 mm×10
mm in dimension, and 64 elements. Images of different fields of views
were constructed from RF data acquired with these arrays using both the
new and conventional dynamic focusing (delay-and-sum) methods. Results
show that qualities of images constructed are almost identical with the
two methods in terms of sidelobes, contrast, and lateral and axial
resolutions. Phase aberration has also been assessed for the two
methods, and results show that its influence is about the same on both
methods. In addition, a practical imaging system to implement the new
method is suggested and potential applications of the method are

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  • Jian Yu Lu

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