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Proceedings Paper

New direct pixel beamforming based on phase rotation
Author(s): Yonghyun Kim; Wooyoul Lee; Yuhwa Lee; Yangmo Yoo
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Paper Abstract

Direct pixel beamforming (DPB) where receive focusing is directly performed on each display pixel in Cartesian coordinates using the raw radio-frequency (RF) data can improve spatial and contrast resolutions in medical ultrasound imaging. However, the DPB suffers from the increased computational complexity compared to the conventional delay-and- sum focusing (CON) method since it requires additional focusing points for envelop detection. In this paper, a new DPB method, in which phase rotation (PR) is adopted for reducing the number of the additional focusing points, is presented. In the proposed DPB-PR method, the complex baseband data for each display pixel is directly obtained for envelop detection, so that the unnecessary focusing points can be avoided. To evaluate the performance of the DPB-PR method, in vitro raw RF data were captured from a tissue mimicking phantom using the SonixTouch research platform connected with the SonixDAQ parallel data acquisition system. The hardware saving from the DPB-PR method was compared with the DPB method with interpolation filtering (DPB-INT) method by analyzing the number multiplications. Compared to CON, the proposed DPB-PR method shows enhanced image quality (clear shape and boundaries of masses) under visual assessment and comparable results with the DPB-INT method. Furthermore, the proposed DPB-PR method significantly reduces the number of multiplications by a factor of 3.1 (i.e., 9.0×109 vs 2.9×109 ) over the DPB-INT method. This result indicates that the DPB-PR method can be implemented on a modern ultrasound imaging system while improving image quality.

Paper Details

Date Published: 25 February 2012
PDF: 8 pages
Proc. SPIE 8320, Medical Imaging 2012: Ultrasonic Imaging, Tomography, and Therapy, 83201D (25 February 2012); doi: 10.1117/12.912361
Show Author Affiliations
Yonghyun Kim, Sogang Univ. (Korea, Republic of)
Wooyoul Lee, Sogang Univ. (Korea, Republic of)
Yuhwa Lee, Sogang Univ. (Korea, Republic of)
Yangmo Yoo, Sogang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8320:
Medical Imaging 2012: Ultrasonic Imaging, Tomography, and Therapy
Johan G. Bosch; Marvin M. Doyley, Editor(s)

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