Synthetic aperture focusing for a single-element transducer undergoing helical motion

Andresen, H.; Nikolov, Svetoslav Ivanov; Jensen, Jørgen Arendt

doi:10.1109/tuffc.2011.1894

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…High-resolution 3-D images have been formed by mechanically sweeping [13] or rocking [14] a linear array through the elevation dimension and combining a volume formed by each using a virtual source in elevation. Volumetric images can also be formed by rotating a linear array using diverging transmit beams [15] or using a helical scan geometry with a single focused element and virtual sources in both the lateral and elevation dimensions [16]. …”

Section: Introductionmentioning

confidence: 99%

Feasibility of Swept Synthetic Aperture Ultrasound Imaging

Bottenus

Long

Zhang

et al. 2016

IEEE Trans. Med. Imaging

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Ultrasound image quality is often inherently limited by the physical dimensions of the imaging transducer. We hypothesize that, by collecting synthetic aperture data sets over a range of aperture positions while precisely tracking the position and orientation of the transducer, we can synthesize large effective apertures to produce images with improved resolution and target detectability. We analyze the two largest limiting factors for coherent signal summation: aberration and mechanical uncertainty. Using an excised canine abdominal wall as a model phase screen, we experimentally observed an effective arrival time error ranging from 18.3 ns to 58 ns (root-mean-square error) across the swept positions. Through this clutter-generating tissue, we observed a 72.9% improvement in resolution with only a 3.75 dB increase in side lobe amplitude compared to the control case. We present a simulation model to study the effect of calibration and mechanical jitter errors on the synthesized point spread function. The relative effects of these errors in each imaging dimension are explored, showing the importance of orientation relative to the point spread function. We present a prototype device for performing swept synthetic aperture imaging using a conventional 1-D array transducer and ultrasound research scanner. Point target reconstruction error for a 44.2 degree sweep shows a reconstruction precision of 82.8 μm and 17.8 μm in the lateral and axial dimensions respectively, within the acceptable performance bounds of the simulation model. Improvements in resolution, contrast and contrast-to-noise ratio are demonstrated in vivo and in a fetal phantom.

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Section: Introductionmentioning

confidence: 99%

Feasibility of Swept Synthetic Aperture Ultrasound Imaging

Bottenus

Long

Zhang

et al. 2016

IEEE Trans. Med. Imaging

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“…(They have also a paper in 2012 that shows animal results [11]). In 2011 Andresen et al [12] used synthetic aperture focusing with a single-element transrectal ultrasound transducer, making a helical motion to obtain 3-D volumes. Simulations and a wire phantom experiment showed a significant improvement in azimuth resolution.…”

Section: Literature Overviewmentioning

confidence: 99%

Development of a Low-Cost Medical Ultrasound Scanner Using a Monostatic Synthetic Aperture

Heuvel

Graham

Smith

et al. 2017

IEEE Trans. Biomed. Circuits Syst.

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“…For example, to get 100 μ m lateral resolution at 3 mm, the central frequency of a 0.6 mm diameter IVUS transducer needs to be more than 100 MHz, so it is not a very efficient method. Another possible method to a single-element IVUS transducer is synthetic aperture focusing, which has been shown to be able to improve the imaging resolution and SNR outside focus area by focusing the received signal from several emissions for rotating movements [7]. But it requires large sum data processing and decreases the imaging frame rate.…”

Section: Introductionmentioning

confidence: 99%

A High Frequency Geometric Focusing Transducer Based on 1-3 Piezocomposite for Intravascular Ultrasound Imaging

Jian

Han

Liu

et al. 2017

BioMed Research International

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Due to the small aperture of blood vessel, a considerable disadvantage to current intravascular ultrasound (IVUS) imaging transducers is that their lateral imaging resolution is much lower than their axial resolution. To solve this problem, a single-element, 50 MHz, 0.6 mm diameter IVUS transducer with a geometric focus at 3 mm was proposed in this paper. The focusing transducer was based on a geometric-shaped 1-3 piezocomposite. The impedance/phase, pulse echo, acoustic intensity field, and imaging resolution of the focusing transducer were tested. For comparison, a flat IVUS transducer with the same diameter and 1-3 piezocomposite was made and tested too. Compared with their results, the fabricated focusing transducer exhibits broad bandwidth (107.21%), high sensitivity (404 mV), high axial imaging resolution (80 μm), and lateral imaging resolution (100 μm). The experimental results demonstrated that the high frequency geometric focusing piezocomposite transducer is capable of visualizing high axial and lateral resolution structure and improving the imaging quality of related interventional ultrasound imaging.

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Synthetic aperture focusing for a single-element transducer undergoing helical motion

Cited by 15 publications

References 20 publications

Feasibility of Swept Synthetic Aperture Ultrasound Imaging

Feasibility of Swept Synthetic Aperture Ultrasound Imaging

Development of a Low-Cost Medical Ultrasound Scanner Using a Monostatic Synthetic Aperture

A High Frequency Geometric Focusing Transducer Based on 1-3 Piezocomposite for Intravascular Ultrasound Imaging

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