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Guiding HIFU treatments using elastic properties of ablated tissues is gaining attention since it is non-invasive and can provide new information. Good-quality elasticity imaging requires highly controlled compressions, which are often challenging to obtain with hand-held devices. Here we report the comparison of 4 compression methods for the detection of HIFU ablations created in the liver during...
The article is devoted to the development of measuring bench for determining of the main parameters of the ultrasonic vibrating systems, such as resonance frequency, vibration amplitude, quality factor, transformation ratio of vibrating speeds.
This paper presents a new model-free visual servoing that is able to servo a robotized 2D ultrasound probe that interacts with a soft tissue object. It makes direct use of the B-mode ultrasound images in order to reach a desired one. This approach does not require the 3D model of the object nor its location in the 3D space. The visual features are based on image moments. The exact analytical form...
Ultrasound can be used to phase transition perfluorocarbon (PFC) droplets into gas bubbles, a process known as acoustic droplet vaporization (ADV). In vivo blood flow reductions can then be achieved using the ADV bubbles. An in situ ultrasonic measurement of this blood flow reduction is desirable. Since, in a simple model, initial flow reduction is proportional to the number of bubbles, and the mean...
Research using small animals continues to play a key role in biological, biomedical and veterinary science. In particular both mouse and rat models have become increasingly popular as research tools due to the fact that 90% of the genomic sequences in these rodents are identical to those found in humans. The versatility of employing a high resolution ultrasound scanner to perform small animal microimaging...
For the detection of breast cancer, ultrasound is conventionally used in addition to mammography. However, ultrasound is highly operator-dependent since speckle, depth dependency and other artifacts (e.g. shadowing) affect image quality. Full Angle Spatial Compounding (FASC) may overcome those limitations by superimposing ultrasound data acquired in one cross-sectional plane from aspect angles all...
For the management of early stage atherosclerosis, the concept of metabolic syndrome is important. An inexpensive, ultra-mobile ultrasound imaging device is proposed for the accurate diagnosis of the atherosclerosis. A linear probe capable of transmitting and receiving 64 ultrasound beams with the central frequency of 7.5 MHz is made. Echo images are displayed on a 5.7 inch LCD screen. The dimension...
A new visual servoing method based on B-mode ultrasound images is proposed to automatically control the motion of a 2D ultrasound probe held by a medical robot in order to reach a desired B-scan image of an object of interest. In this approach, combinations of image moments extracted from the current observed object cross-section are used as feedback visual features. The analytical form of the interaction...
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