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231222s2001 xx ||||| 00| ||eng c |
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|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Liang, H D
|e verfasserin
|4 aut
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|a Continuous wave ultrasonic tomography
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|c 2001
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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 07.06.2001
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|a Date Revised 15.09.2019
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|a published: Print
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|a Citation Status MEDLINE
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|a As an object rotates with respect to a stationary ultrasonic beam, the scattering centers within the object return echoes that are Doppler-shifted in frequency by amounts depending on the velocities of the individual scatterers. The scattering centers that lie on a line of constant cross-range all have the same effective velocity in the direction pointing toward the transducer; therefore, the backscattered echo amplitude at any particular frequency is the line integral of the scattered radiation at the cross-range corresponding to that frequency. The amplitudes of the returned signals at other frequencies give the line integrals for the scatterers at the corresponding cross-ranges. The amplitude as a function of frequency can be interpreted as a tomographic projection. A continuum of the projections at different positions is generated while the object is rotating. A tomographic reconstruction algorithm can produce an image of the distribution of scattering centers in the insonified object from these projections. A microscanner was developed to investigate the approach of using continuous wave (CW) ultrasound for cross-sectional imaging. The resolution is limited by the target size and the ultrasonic wavelength
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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1 |
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|a Halliwell, M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wells, P N
|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 48(2001), 1 vom: 29. Jan., Seite 285-92
|w (DE-627)NLM098181017
|x 1525-8955
|7 nnas
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| 773 |
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|g volume:48
|g year:2001
|g number:1
|g day:29
|g month:01
|g pages:285-92
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|d 48
|j 2001
|e 1
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|h 285-92
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