This paper presents the revised estimates of various ultrasonographic markers used in practice for estimation of gestational age among singleton Indian population. Accurate estimation of gestational age plays a vital role in efficient obstetric planning and also helps us to estimate fetal malformation or growth retardation. Incorrect estimation of gestational age can result in grave complicatio...

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...

A fast registration making use of implicit polynomial (IP) models is helpful for the real-time pose estimation from single clinical free-hand Ultrasound (US) image, because it is superior in the areas such as robustness against image noise, fast registration without enquiring correspondences, and fast IP coefficient transformation. However it might lead to the lack of accuracy or failure regist...

A robot-assisted system for medical diagnostic ultrasound has been developed by the authors. This paper presents key features of the user interface used in this system. While the ultrasound transducer is positioned by a robot, the operator, the robot controller, and an ultrasound image processor have shared control over its motion. Ultrasound image features that can be selected by the operator ...

In this paper we introduce Spatially Aware Expectation Maximization (SpAEM), a new parameter estimation method which incorporates information pertaining to spatial prior probability into the traditional expectationmaximization framework. For estimating the parameters of a given class, the spatial prior probability allows us to weight the contribution of any pixel based on the probability of tha...

In statistical signal processing, hybrid parameter estimation refers to the case where the parameters vector to estimate contains both non-random and random parameters. Numerous works have shown the versatility of deterministic constrained Cramér-Rao bound for estimation performance analysis and design of a system of measurement. However in many systems both random and non-random parameters may...

The artery pulsation has a strong correlation with the blood flow in the newborn baby head and tissuemotion has a relationship with artery pulsation. In this paper, we propose a novel method to estimate the tissuemotion quantitatively by combining local and global motion estimation methods, namely combined local-global (CLG) optical flow technique in cranial ultrasonogram of newborn babies. Tis...

In this work we propose a novel ap roach for demodulating Continuous Phase Modulation CPM) signals based Q on the modeling of the instantaneous phase as a piecewise polynomial-phase function. The polynomial modeling can be a good approximation for currently used modulations or it can be-exact if the shaping pulse is chosen to be a oiecewise polvnomial function. The crucial step in the demodulat...

Some geophysical calibration results on the level 1 ASAR WVI products are presented in the continuity of the investigations performed on the ERS1/2 SAR Wave Mode products. Investigations have been focussed on comparisons with co-located ECMWF winds. In particular, a calibration constant is tentatively derived using CMOD-IFREMER model function. Following standard azimuthal resolution losses over...

This paper deals with improving the time-frequency resolution of Doppler ultrasound spectroscopy, applied to blood flow analysis, by developing robust nonstationary spectrum estimation techniques based on Gabor filterbanks and multiband AM-FM demodulation that uses an instantaneous energy separation algorithm.