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Growing demand for bedside medical imaging with increased ease of access has motivated development of more cost-effective ultrasound systems. Multimodal imaging techniques such as Microwave-induced Thermoacoustic (TA) tomography can simplify system design by providing enhanced imaging contrast. The introduction of continuous-wave (CW) TA has made this technique more cost-effective by reducing device...
FDMAS has been successfully used in microwave imaging for breast cancer detection. FDMAS gained its popularity due to its capability to produce results faster than any other adaptive beamforming technique such as minimum variance (MV) which requires higher computational complexity. The average computational time for single point spread function (PSF) at 40 mm depth for FDMAS is 87 times faster than...
The applications of ultrasound in medicine have been increasing in the last decade either in diagnostics or in treatments. Ultrasound is routinely used in clinical examinations, such as pregnancy exams. On the other hand, a typical ultrasound system costs somewhere between 100k$ to 250k$ because of its (1) expensive ultrasound transducers, (2) large driving electronics, (3) processing and visualization...
In the field of vascular interventions, forward-looking intravascular ultrasound transducers (FL-IVUS) are needed for better visualization of complex lesions, such as chronic total occlusions. In this work, we propose a strategy for 3D imaging using a single-element transducer and an optical shape sensing fiber (OSS) in a steerable catheter tip. We evaluate the performance of the integrated device...
All adaptive beamformers aim at increased resolution and better contrast. However, the same effect can be produced by dynamic range stretching. Adaptive beamformers are often tested on wire targets or uniform cysts, which do not allow to study dynamic range alterations. This work shows that dynamic range stretching may account for some of the benefits of some adaptive beamformers in the literature...
Photoacoustic (PA) imaging employs a pulsed laser to generate acoustic waves to be detected with a piezoelectric transducer. A coaxial, or even confocal, optical-acoustic arrangement has been desired to achieve high resolution and high sensitivity PA imaging. This research reports several designs and fabrications of sol-gel based PZT/PZT single-element transducers for coaxial PA imaging. At first,...
Proper spatial sampling is critical for high quality imaging. If the sampling criterion is not met, grating lobe artifacts appear in the image. In non-destructive testing applications efficiency is being increased by the steady enlargement of the field of view, resulting in more elements and thus a higher transducer complexity and cost. In the volume scanning methods used in medical applications,...
Ultrasound is a well-established imaging modality used in clinics worldwide for many different applications. It has also experienced recent growth in interest for therapeutic applications in the form of high-intensity focused ultrasound (HIFU) or focused ultrasound (focused-US), including in capsules for use in drug delivery in the gut. The work described here aimed to support the investigation of...
This paper describes a contribution to the Plane-wave Imaging Challenge in Medical UltraSound (PICMUS). The suggested beamformer uses Capon's Minimum Variance beamforming technique to create the low quality plane-wave images and the same Minimum Variance criteria when coherently compounding multiple low quality plane-wave images into one image of higher quality. This results in a Double Adaptive Plane-wave...
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