Search results for "Sound"

A system for the automatic measurement of the nuchal translucency thickness from ultrasound video stream of the foetus

2013

Nowadays the measurement of the nuchal translucency thickness is being used as part of routine ultrasound scanning during the end of the first trimester of pregnancy, for the screening of chromosomal defects, as trisomy 21. Currently, the measurement is being performed manually by physicians. The measurement can take a long time for being accomplished, needs to be performed by highly skilled operators, and is prone to errors. Semi-automated methods requires that the user manually selects a region of the image containing the nuchal translucency, procedure that is somewhat time consuming. In this paper we present a complete system prototype that is able to perform the measurement of the nucha…

Detrimental noise effects on brain's speech functions.

2009

Background noise has become part of our everyday life in modern societies. Its presence affects both the ability to concentrate and communicate. Some individuals, like children, the elderly, and non-native speakers have pronounced problems in noisy environments. Here we review evidence suggesting that background noise has both transient and Sustained detrimental effects on central speech processing. Studies on the effects of noise on neural processes have demonstrated hemispheric reorganization in speech processing in adult individuals during background noise. During noise, the well-known left hemisphere dominance in speech discrimination became right hemisphere preponderant. Furthermore, l…

Multimodality 3-dimensional volumetric ultrasound in obstetrics and gynecology with an emphasis in HDlive technique.

2013

HDlive (high-definition live or real-time US), a new ultrasound software, combines a movable virtual adjustable light source in a software that calculates the proportion of light reflecting through surface structures, depending on light direction. The light source can be manually positioned to illuminate the desired area of interest. The ultrasound technician can control light intensity to create shadows that enhance image quality. HDlive is an innovation that will render even more realistic images of fetal anatomy and of gynecologic lesions. The full potential of this new technology is yet to be determined and deserves scientific evaluation.

Coplanar Indirect-Navigated Intraoperative Ultrasound: Matching Un-navigated Probes With Neuronavigation During Neurosurgical Procedures. How We Do I…

2021

BACKGROUND Intraoperative ultrasound (IOUS) is becoming more and more adopted in neurosurgery, since it has been associated to greater extent of resection (EOR) and to gross total resection (GTR) during brain tumor surgery. IOUS main limitations are spatial resolution, width and orientation of the field of view and scan quality, which are operator-dependent. Furthermore, most neurosurgeons are not confident with this technique, which needs a long learning curve in order to identify and interpret anatomic structures. OBJECTIVE To describe an effective procedure to take advantages of both IOUS and neuronavigation in case of lack of a navigated ultrasound system. METHODS We propose a reliable …

Conservative Surgery of Renal Tumors: Operative Technique, Complications, Results, DNA Cytometry

1992

Until now radical nephrectomy has been regarded as the standard therapy for nonmetastasized renal cell carcinoma. This operation has been accepted because of the theoretical advantage of a more complete resection. A parenchyma-sparing operation was only performed in patients in whom radical nephrectomy would result in renal failure requiring hemodialysis (imperative indication), such as patients with single kidney, bilateral tumors, dysfunctional contralateral kidney, or chronic renal failure. However, the widely used partial nephrectomy in these instances may in certain cases result in insufficient residual renal parenchyma. Simple enucleation of the tumor with a small surrounding margin o…

<title>Ultrasound detection of cavitation as a phenomenon common to intervention devices causing tissue ablation</title>

1992

Cavitation previously has been observed in association with ultrasonic angioplasty and high- frequency rotational atherectomy. This study evaluates the production of cavitation accompanying the use of several catheter-based devices under development or in current use in the practice of interventional cardiology. Catheters were examined in an in vitro model, and cavitation was evaluated using standard ultrasound imaging equipment. Cavitation was detected with each of the devices that effects tissue ablation, but not tissue resection. Devices produced characteristic patterns of cavitation dependent on the mode of energy release of the device. The size, but not the intensity, of the cavitation…

Medical Student Ultrasound Education, a WFUMB Position Paper, Part I, response to the letter to the Editor.

2019

Should Reinke edema be considered a contributing factor to post-extubation failure?

2015

We read with interest the recently published review in Critical Care about post-extubation laryngeal edema and stridor by Pluijms et al. [1]. The review considers in detail the risk factors for post-extubation respiratory failure and describes a post-extubation algorithm for its prevention and reduction. We recently published a case report describing the occurrence of post-extubation stridor leading to post-extubation respiratory failure in a woman with a previously undiagnosed Reinke edema (RE) [2]. RE is a progressive laryngeal soft-tissue swelling. The condition typically manifests in female gender as hoarseness and as a gradually deepening voice in patients with a history of smoking, vo…

Oxidative tissue damage after phacoemulsification: influence of ophthalmic viscosurgical devices.

2003

To quantify the oxidative tissue damage after phacoemulsification, correlate the damage to the energy applied, and investigate the influence of ophthalmic viscosurgical devices (OVDs).Department of Ophthalmology, University of Mainz, Mainz, Germany.The study comprised 130 eyes operated on by 1 surgeon using the same phacoemulsification machine. Some eyes received an OVD before phacoemulsification and some did not. Energy values were expressed as phaco time; that is, ultrasound (US) time (seconds) after conversion to 100% phaco power. Patients were grouped as follows: Group 1, phaco time less than 20 seconds and no OVD; Group 2, phaco time 20 to 40 seconds and no OVD; Group 3, phaco time mor…

Contrast-enhanced ultrasound of hepatocellular carcinoma: where do we stand?

2019

Contrast-enhanced ultrasound (CEUS) represents a significant breakthrough in ultrasonography (US), and it is being increasingly used for the evaluation of focal liver lesions (FLLs). CEUS is unique in that it allows non-invasively assessment of liver perfusion in real time throughout the vascular phase, which has led to dramatic improvements in the diagnostic accuracy of US in the detection and characterization of FLLs, the choice of therapeutic procedures, and the evaluation of response. Currently, CEUS is included as a part of the suggested diagnostic work-up of FLLs, including in cirrhotic patients with hepatocellular carcinoma, resulting in better patient management and cost-effective d…