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A comparative study has been done of the static B-scan ultrasound appearance of the quadriceps muscle of the thigh in 60 new patients attending our muscle clinic and in 60 control children. In the control subjects there was good visualization of bone and fascia, which stood out clearly against the background of echo-free muscle tissue. Striking change was(More)
The propagation of ultrasound pulses in inhomogeneous media is described, and it is shown that they are scattered by fluctuations in density and compressibility. It is proposed that some of the echoes recorded by diagnostic pulse echo equipment are produced in this way. The precise form of the acoustic field backscattered from tissues is calculated using(More)
B-mode ultrasound images are characterised by the speckle artefact, which introduces fine-false structures whose apparent resolution is beyond the imaging system capabilities. Speckle presence is due to interference effects between overlapping echoes and its occurrence is related to a great number of randomly distributed structure scatterers within a(More)
A comparative study of the ultrasound appearances of the thigh with the static B scan showed consistent differences in 10 children with muscular dystrophy compared with 40 healthy controls. This non-invasive technique could be useful in assessing the extent of pathological change in dystrophic patients and could prove a valuable diagnostic aid.
An algorithm for nonparametric estimation of 1-D ultrasound pulses in echo sequences from human tissues is derived. The technique is a variation of the homomorphic filtering technique using the real cepstrum, and the underlying basis of the method is explained. The algorithm exploits a priori knowledge about the structure of rf line echo data and can employ(More)
It is demonstrated that the instantaneous frequency of a backscattered echo sequence can be used to pinpoint the location of destructive interference effects. These interference artefacts, which are generally interpreted as speckle in the image, are generally removed by stochastic averaging or filtering methods applied to the acquired image. The method(More)
The effect of an imcomplete field of view on the reconstruction of objects from their projections is considered. An exact analytical method is used to calculate the reconstruction of an impulse and an annulus which lie out the field of view of an imaging device. A general impression of the effects of truncating the projections of any object may be obtained(More)
An algorithm for non-parametric estimation of one-dimensional ul-trasound pulses in echo sequences from human tissues is derived. The technique is a variation of the homomorphic ltering technique using the real cepstrum, and the underlying basis of the method is explained. The algorithm exploits a priori knowledge about the structure of rf line echo data(More)
A practical method of assessing ultrasonic A-scan pulse-echo scanner performance is described, which relies upon the identification and quantitation of an overall system transfer function. The mapping of reflecting elements into an image is then described by this transfer function, and indices of system performance, and particularly resolution and range(More)