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KMID : 1144120130030040242
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Biomedical Engineering Letters
2013 Volume.3 No. 4 p.242 ~ p.249
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Shear wave speed imaging using unfocused plane wave transmission
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Park Jeong-Man
Kwon Sung-Jae
Jeong Mok-Kun
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Abstract
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Purpose: A shear wave is generated when a focused ultrasound is transmitted to an imaging region of interest and the medium is pushed. The shear modulus can be quantitatively determined by measuring the speed of a shear wave in a human soft tissue. This paper presents a method of measuring the speed of a quasi-planar shear wave propagating in the elevation direction in which a high-intensity burst-type unfocused plane wave insonifies a wide area of soft tissue simultaneously.
Methods: Experiments were carried out to acquire data from elasticity phantoms subjected to burst-pulse plane wave insonification, and the shear modulus was estimated by measuring the time to peak displacement as well as the time to 80% of peak displacement.
Results: It was found that using the proposed method in a plastic ultrasound elasticity phantom, shear waves could be generated up to a depth of 40 mm without focusing and that shear wave speeds could be differentiated in both homogeneous and cylindrical inclusion phantoms.
Conclusion: The proposed method is advantageous in that the shear wave speed at all imaging points can be measured simultaneously and that an elasticity image can be constructed with only a single pushing transmission. The shear wave speed can be determined by measuring only the arrival time based on the time-of-flight principle.
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KEYWORD
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Acoustic radiation force, Elasticity, Shear wave, Shear modulus, Unfocused plane wave
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