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Real-time three-dimensional ultrasou...

Hazard, Christopher Robert.

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Real-time three-dimensional ultrasound imaging using synthetic aperture beamforming.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Real-time three-dimensional ultrasound imaging using synthetic aperture beamforming./
作者:	Hazard, Christopher Robert.
面頁冊數:	209 p.
附註:	Adviser: Geoffrey R. Lockwood.
Contained By:	Dissertation Abstracts International62-08B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3022497
ISBN:	9780493340753

Real-time three-dimensional ultrasound imaging using synthetic aperture beamforming.
Hazard, Christopher Robert.

Real-time three-dimensional ultrasound imaging using synthetic aperture beamforming. - 209 p.

Adviser: Geoffrey R. Lockwood.

Thesis (Ph.D.)--The Ohio State University, 2001.

Real-time 3D ultrasound imaging has the potential to provide unique clinical information. The beamformer for a real-time 3D system must be capable of generating many beams simultaneously. Conventional beamforming is limited, by the speed of sound, to thirty 2D images per second, a rate not sufficient for real-time 3D imaging. A beamformer, using a limited number of transmits and a synthetic aperture technique, is proposed as a method of high-speed beamforming, which would allow real-time 3D imaging. The proposed digital beamformer uses linear interpolation to improve beamforming delay accuracy while maintaining achievable sampling rates. A theoretical assessment of the beamformer is presented, which examines the effects of quantization in both the analog-to-digital conversion and the finite-length digital implementation of the system. The results of these simulations show that the resolution and contrast properties of the system are comparable to a conventional system which operates at much lower frame rates. In addition, motion was found to minimally affect the performance of this system.

ISBN: 9780493340753Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Real-time three-dimensional ultrasound imaging using synthetic aperture beamforming.
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520 $a Real-time 3D ultrasound imaging has the potential to provide unique clinical information. The beamformer for a real-time 3D system must be capable of generating many beams simultaneously. Conventional beamforming is limited, by the speed of sound, to thirty 2D images per second, a rate not sufficient for real-time 3D imaging. A beamformer, using a limited number of transmits and a synthetic aperture technique, is proposed as a method of high-speed beamforming, which would allow real-time 3D imaging. The proposed digital beamformer uses linear interpolation to improve beamforming delay accuracy while maintaining achievable sampling rates. A theoretical assessment of the beamformer is presented, which examines the effects of quantization in both the analog-to-digital conversion and the finite-length digital implementation of the system. The results of these simulations show that the resolution and contrast properties of the system are comparable to a conventional system which operates at much lower frame rates. In addition, motion was found to minimally affect the performance of this system.
520 $a The synthetic aperture beamformer was implemented digitally, using a network of high-speed digital signal processors. The practical issues related to the implementation of the beamformer included: communication between processors; interfacing the beamformer with other components such as the front-end electronics, the transducer, and the scan conversion system; and characterizing the performance of the analog-to-digital converters. The communication between processors in the network was found to limit the performance of the system. Calibrations and supporting software, as well as the optimized algorithms for beamforming, are described. The software was written in specialized parallel instruction assembly code to optimize performance. The beamformer was evaluated using narrowband inputs. The system has a dynamic range of greater than 50 dB, resolution similar to a conventional beamformer, and is capable of generating 6.6 million points per second.
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