BACKGROUND Accuracy of some ultrasound equations used in our locality for fetal weight estimation is doubtful. OBJECTIVE To assess the accuracy of common ultrasound equations used for fetal weight estimation. SUBJECTS AND METHODS A longitudinal study was conducted on selected Nigerian obstetric population at Central Hospital, Kwale between March, 2009 and January, 2011. Sonography was perfo...

Ultrasound contributes immensely to obstetrics and its application and use is now widespread. The clinical applications and uses of ultrasound include confirmation of pregnancy and multiple gestation, estimation of gestational age, localisation of placenta and monitoring of foetal wellbeing. The others are evaluation of caesarean section scar integrity and post partum haemorrhage. Ultrasound is...

In the context of minimally-invasive procedures involving both endoscopic video and ultrasound, we present a vision-based method to track the ultrasound probe using a standard monocular video laparoscopic instrument. This approach requires only cosmetic modification to the ultrasound probe and obviates the need for magnetic tracking of either instrument. We describe an Extended Kalman Filter fr...

Contrast resolution and detail resolution are two important parameters in ultrasound imaging. This paper presents a new method to enhance these parameters, simultaneously. A parallel auxiliary beamformer has been employed whose weightings are such that an estimation of the leaked signal through the main beamformer is obtained. Then the output of main beamformer is modified according to the ...

We propose a method for tissue characterization of coronary plaque using IntraVascular UltraSound (IVUS) data. In the proposed algorithm, the probability density function of each plaque is calculated by the kernel density estimation and neural gas. The probability distributions vary continuously and overlap one another in the feature space. The class labels of tissue are determined by using Bay...

In this thesis, we investigate using the new generation of programmable Graphics Processing Units (GPUs) which support floating point computations for statistical restoration of ultrasound images. Deconvolution is a widely used method of recovering an image from degradation caused by blurring, and thus increasing the image quality. We present a modified Bayesian 2D deconvolution method which pr...

In this thesis, we investigate using the new generation of programmable Graphics Processing Units (GPUs) which support floating point computations for statistical restoration of ultrasound images. Deconvolution is a widely used method of recovering an image from degradation caused by blurring, and thus increasing the image quality. We present a modified Bayesian 2D deconvolution method which pr...

Cardiac ultrasound plays an important role in the imaging of hearts in basic cardiovascular research and clinical examinations. 3D ultrasound imaging can provide the geometry or motion information of the heart. Especially, the wrapping of cardiac fiber orientations to the ultrasound volume could supply useful information on the stress distributions and electric action spreading. However, how to...

In diagnostic ultrasound imaging the speed of sound is assumed to be 1540 m/s in soft tissues. When the actual speed is different, the mismatch can lead to distortions in the acquired images and so reduce their clinical value. Therefore, the estimation of the true speed has been pursued not only because it enables image correction but also as a way of tissue characterisation. In this article, w...