Background. High-power intracavitary ultrasound abbreviates left ventricular (LV) ejection duration, thereby decreasing mechanical LV performance, presumably by selective impairment of endocardial endothelial function. Methods and Results. Effects of ultrasound were evaluated in the ejecting LV of anesthetized, open-chest dogs under different conditions of LV volume and contractile state and af...

A real-time photoacoustic imaging system is designed and built. This system is based on a commercially available ultrasound imaging system. It can achieve a frame rate of 8 frames/sec. Vasculature in the hand of a human volunteer is imaged, and the resulting photoacoustic image is combined with the ultrasound image. The real-time photo acoustic imaging system with a hybrid ultrasound probe is d...

We model the process of imaging soft tissues with a 3D ultrasound probe using a linear convolution model, and obtain analytical expressions of both the ultrasound image and its spectrum. We use this model to study the ultrasound decorrelation caused by tissue motion both in the spatial domain and spectral domain. Finally, we propose a spectral-feature-based algorithm to analyze tissue motion. T...

A teleoperation approach to diagnostic ultrasound, in which the ultrasound transducer is positioned by a robot, is described in this paper. An inherently safe counterbalanced robot has been designed and tested in carotid artery examinations. The feasibility of using visual servoing for motion in the plane of the ultrasound probe has also been demonstrated using a modified image correlation algo...

In this paper we describe an approach to interactively render ultrasound images for a transesophageal echocardiogram procedure. Our prototype features an animated 3D model of a human heart that is used to synthesize virtual ultrasound images in real-time. The user can control the probe and interact with the simulator via a GUI or with a haptics device. The ultrasound plane is rendered in a clas...

Ultrasound can provide real-time image guidance of radiation therapy, but the probe-induced tissue deformations cause local deviations from the treatment plan. If placed during treatment planning, the probe causes streak artifacts in required computed tomography (CT) images. To overcome these challenges, we propose robot-assisted placement of an ultrasound probe, followed by replacement with a ...

BACKGROUND Numerous studies have shown significant benefits of using real-time ultrasonography for central line intravenous access. Traditionally, the ultrasound probe is placed along the short axis of the vein to visualize and direct needle placement. This view has some limitations, particularly being able to visualize the needle tip. Some practitioners place the ultrasound probe in the long a...

  ABSTRACTBackground : In order to quantify effects of ultrasound irradiation parameters under therapeutic condition, especially sonodynamic therapy, it is initially necessary to evaluate inertial cavitation activity in vitro conditions therefore, in this study, the effect of 1 MHz low level ultrasound based on °OH radicals generated by acoustic inertial cavitation in aqueous solution was monit...

In the fields of X-ray CT, MRI, and nuclear medicine, three-dimensional (3D) imaging techniques, mainly based on segmentation methods, for extracting the surface contours of 3D structures are widely used in clinical applications in order to obtain stereoscopic information regarding anatomical structures. It has been difficult to apply such segmentation techniques to diagnostic ultrasound images...

Adult Wuchereria bancrofti can be readily detected by ultrasound in the lymphatic vessels of the spermatic cord with a 7.5-MHz transducer, but most ultrasound machines in developing countries are equipped with 3.5-MHz transducers. To assess the potential for ultrasound as a tool for diagnosis and epidemiologic assessment in lymphatic filariasis, we compared the performance of 3.5-MHz and 7.5-MH...