1. Homozygous α-thalassaemia-1 can be predicted reliably using ultrasound measurement of the foetal cardiothoracic ratio at 12 to 13 weeks’ gestation, but not at 10 to 11 weeks’ gestation. 2. When an optimal foetal cardiothoracic ratio cannot be obtained with an abdominal ultrasound examination at 12 to 13 weeks’ gestation, a vaginal ultrasound examination is useful. 3. The use of ultrasonograp...

In this paper we propose a reconstruction algorithm with alignment for free-hand 3D ultrasound. A set of ultrasound images with the associated positions and orientations are stored and used to reconstruct a given region of interest (ROI). In freehand ultrasound, the inspection planes are not parallel nor uniformly spaced. The proposed reconstruction algorithm deals with this non uniform samplin...

Introduction: Tracking muscle movement can be very useful in diagnosis and rehabilitation of patients with neuromuscular disorders. Doppler ultrasound is well suited for analysis of musculoskeletal movement, but conventional ultrasound systems are bulky and not suitable for monitoring patients during ambulatory gait. A wireless Doppler ultrasound system can allow for direct measurement of muscu...

This paper presents the design and implementation of a fully integrated transimpedance amplifier (TIA) as the analog frontend receiver for Capacitive Micromachined Ultrasound Transducers (CMUTs) for ultrasound biomicroscope imaging application. The amplifier is designed to amplify the received signals from 17.5MHz to 52.5MHz with a center frequency of 35MHz. The TIA was fabricated in GF 0.18μm ...

Bearing failure is often attributed to be one of the major causes of breakdown in industrial rotating machines that operate at high and low speeds. This paper presents results of a comparative experimental study on the application of the ultrasound technique for condition monitoring of low speed rolling element bearings and conventional vibration measurements with seeded faults on inner-race de...

Introduction: There is a long history of motion compensation in MRI using navigator echoes, now a mature technique [1]. MR navigators work well, but their applications have been limited by several factors: the need to slow down imaging in order to make time for the navigator, interference with the steady state of the base sequence, and substantial engineering needed to implement and validate ne...

Introduction: This study presents a computerized analyzing method for detection of instantaneous changes of far and near walls of the common carotid artery in sequential ultrasound images by applying the maximum gradient algorithm. Maximum gradient was modified and some characteristics were added from the dynamic programming algorithm for our applications. Methods: The algorithm was evaluat...

The influence of surface vibrations on the intensity of sonochemiluminescence (SCL) produced by pulsed ultrasound with a frequency of 151 kHz is investigated through optical measurement of the vibration amplitude. Pulsed ultrasound inhibits the generation of large degassing bubbles that restrict the efficient spatial region for sonochemical reaction. The vibration amplitude of the liquid surfac...

We present a standardized method for using four-dimensional ultrasound (4D US) guidance for peripheral nerve blocks. 4D US allows for needle tracking in multiple planes simultaneously and accurate measurement of the local anesthetic volume surrounding the nerve following injection. Additionally, the morphology and proximity of local anesthetic spread around the target nerve is clearly seen with...