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Physics of tissue harmonic imaging b...

Jing, Yuan.

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Physics of tissue harmonic imaging by ultrasound.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Physics of tissue harmonic imaging by ultrasound./
作者:	Jing, Yuan.
面頁冊數:	153 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6431.
Contained By:	Dissertation Abstracts International65-12B.
標題:	Physics, Acoustics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3157382
ISBN:	0496901311

Physics of tissue harmonic imaging by ultrasound.
Jing, Yuan.

Physics of tissue harmonic imaging by ultrasound. - 153 p.

Source: Dissertation Abstracts International, Volume: 65-12, Section: B, page: 6431.

Thesis (Ph.D.)--Boston University, 2005.

Tissue Harmonic Imaging (THI) is an imaging modality that is currently deployed on diagnostic ultrasound scanners. In THI the amplitude of the ultrasonic pulse that is used to probe the tissue is large enough that the pulse undergoes nonlinear distortion as it propagates into the tissue. One result of the distortion is that as the pulse propagates energy is shifted from the fundamental frequency of the source pulse into its higher harmonics. These harmonics will scatter off objects in the tissue and images formed from the scattered higher harmonics are considered to have superior quality to the images formed from the fundamental frequency. Processes that have been suggested as possibly responsible for the improved imaging in THI include: (1) reduced sensitivity to reverberation, (2) reduced sensitivity to aberration, and (3) reduction in side lobes. By using a combination of controlled experiments and numerical simulations, these three reasons have been investigated. A single element transducer and a clinical ultrasound scanner with a phased array transducer were used to image a commercial tissue-mimicking phantom with calibrated targets. The higher image quality achieved with THI was quantified in terms of spatial resolution and "clutter" signals. A three-dimensional model of the forward propagation of nonlinear sound beams in media with arbitrary spatial properties (a generalized KZK equation) was developed. A time-domain code for solving the KZK equation was validated with measurements of the acoustic field generated by the single element transducer and the phased array transducer. The code was used to investigate the impact of aberration using tissue-like media with three-dimensional variations in all acoustic properties. The three-dimensional maps of tissue properties were derived from the datasets available through the Visible Female project. The experiments and simulations demonstrated that second harmonic imaging (1) suffers less clutter associated with reverberation; (2) is not immune to aberration effects and (3) suffers less clutter due to reduced side-lobe levels. The results indicate that side lobe suppression is the most significant reason for the improvement of second harmonic imaging.

ISBN: 0496901311Subjects--Topical Terms:

1019086
Physics, Acoustics.

Physics of tissue harmonic imaging by ultrasound.
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