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231223s1992 xx ||||| 00| ||eng c |
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|a pubmed25n0592.xml
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|a (NLM)18267645
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|e rakwb
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|a eng
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| 100 |
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|a Weng, L
|e verfasserin
|4 aut
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|a Nonuniform phase distribution in ultrasound speckle analysis. I. Background and experimental demonstration
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|c 1992
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 02.10.2012
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|a Date Revised 12.02.2008
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a In some cases, the statistical properties of the phase of ultrasound speckle in B-scan images differ from the uniform distribution characteristic exhibited by the fully developed speckle. This phenomenon has been noted when examining scattering structures with a somewhat regular spacing using wideband pulse excitation. It is shown by computer simulation and experiments on phantoms that when the mean scatterer spacing is equal to multiples of a half wavelength at the reference frequency of the receiver quadrature demodulator, the center of the echo phase distribution, plotted on the complex plane, will shift away from the origin. When the spacing is equal to an odd multiple of a quarter wavelength, the phase distribution will have a figure ;8' shape. By noticing those noncircular phase distributions while changing the demodulation frequency, the mean scatterer spacing can be estimated
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|a Journal Article
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|a Reid, J M
|e verfasserin
|4 aut
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|a Shankar, P M
|e verfasserin
|4 aut
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|a Soetanto, K
|e verfasserin
|4 aut
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| 700 |
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|a Lu, X M
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t IEEE transactions on ultrasonics, ferroelectrics, and frequency control
|d 1986
|g 39(1992), 3 vom: 28., Seite 352-9
|w (DE-627)NLM098181017
|x 1525-8955
|7 nnns
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| 773 |
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|g volume:39
|g year:1992
|g number:3
|g day:28
|g pages:352-9
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|a AR
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|d 39
|j 1992
|e 3
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|h 352-9
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