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Journal of Medical Imaging • Open Access

Synthetic tracked aperture ultrasound imaging: design, simulation, and experimental evaluation

Paper Abstract

Ultrasonography is a widely used imaging modality to visualize anatomical structures due to its low cost and ease of use; however, it is challenging to acquire acceptable image quality in deep tissue. Synthetic aperture (SA) is a technique used to increase image resolution by synthesizing information from multiple subapertures, but the resolution improvement is limited by the physical size of the array transducer. With a large F-number, it is difficult to achieve high resolution in deep regions without extending the effective aperture size. We propose a method to extend the available aperture size for SA—called synthetic tracked aperture ultrasound (STRATUS) imaging—by sweeping an ultrasound transducer while tracking its orientation and location. Tracking information of the ultrasound probe is used to synthesize the signals received at different positions. Considering the practical implementation, we estimated the effect of tracking and ultrasound calibration error to the quality of the final beamformed image through simulation. In addition, to experimentally validate this approach, a 6 degree-of-freedom robot arm was used as a mechanical tracker to hold an ultrasound transducer and to apply in-plane lateral translational motion. Results indicate that STRATUS imaging with robotic tracking has the potential to improve ultrasound image quality.

Paper Details

Date Published: 8 April 2016
PDF: 13 pages
J. Med. Imag. 3(2) 027001 doi: 10.1117/1.JMI.3.2.027001
Published in: Journal of Medical Imaging Volume 3, Issue 2
Show Author Affiliations
Haichong K. Zhang, Johns Hopkins Univ. (United States)
Alexis Cheng, Johns Hopkins Univ. (United States)
Nick Bottenus, Duke Univ. (United States)
Xiaoyu Guo, Johns Hopkins Univ. (United States)
Gregg E. Trahey, Duke Univ. (United States)
Emad M. Boctor, Johns Hopkins Univ. (United States)

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