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Speckle reduction in ultrasonic imaging for medical applications

Speckle reduction in ultrasonic imaging for medical applications,10.1109/ICASSP.1991.151032,T. Greiner,C. Loizou,M. Pandit,J. Mauruschat,F. W. Albert

Speckle reduction in ultrasonic imaging for medical applications   (Citations: 2)
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The application of SAR speckle reduction filters for the purpose of ultrasonic imaging is introduced. A new adaptive filter is proposed which yields a significant improvement of sharpness in edge areas and better smoothing in homogeneous regions. The new filter incorporates high statistical moments which are weighted by their normalized local entropy determined by a moment window around the central pixel. Furthermore, a recursive version, which is algorithmically more efficient, is suggested. The results are illustrated by applying the filter to noise-corrupted artificial edge areas and ultrasonic agar phantoms. As a practical application the diagnosis of immune rejections in transplanted kidneys is demonstrated
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    • ...Speckle, a form of multiplicative noise corrupts medical US imaging making v isual observation d ifficult [2], [7]-[8]...
    • ...From an engineering point of view, speckle is most often considered a dominant source of noise in US and therefore should be filtered out [2], [7], [9]-[10]...
    • ...These can be separated into three broad categories [1]-[7]: a) Those utilizing the statistical properties, such as the first (mean) and the second moment (variance- 2 ) in a neighbourhood...
    • ...2) Techniques utilizing the frequency spectrum of the image, which h ave been proved n ot to be very useful for speckle reduction or image e nhancement and restoration [4], [7], [10]-[12]...
    • ...d) The thresholds used in the filtering p rocess are insufficient i n the window-based approaches [7], [13]-[14]...
    • ...It can b e found in the literature [2], [7] and is derived as:...
    • ...We have e valuated the results with 17 different texture descriptors shown in Table II. Other r esearchers [2], [7], [10], [13], [14] have evaluated their techniques on a very limited number of US images (3-4) and tested their techniques based o n a handful of texture features like the variance, the mean and the speckle index between the original and the filtered image...

    C. Loizouet al. Speckle reduction in ultrasound images of atherosclerotic carotid plaq...

    • ...These features are used to maintain edges for speckle reduction [14]...

    M.-C. Taineet al. Segmentation of cardiac and vascular ultrasound images with extension ...

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