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Proceedings Paper

A new direct pixel-based focusing method for medical ultrasound imaging: preliminary results
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Paper Abstract

In medical ultrasound imaging, scan conversion is used to geometrically transform polar coordinate ultrasound data into Cartesian raster data for display. In scan conversion, Moiré undersampling artifacts can be avoided by using various interpolation techniques such as nearest neighbor and bilinear. However, this interpolation-based scan conversion introduces blurring of fine details in ultrasound images. In this paper, a new beamforming technique, named compounded direct pixel beamforming (CDPB), is proposed to remove blurring artifacts from scan conversion. In CDPB, receive focusing is performed directly on each display pixel in Cartesian coordinates with raw radio-frequency (RF) data from two adjacent transmit firings so that artifacts from scan conversion can be substantially removed. To evaluate the proposed CDPB method, 64-channel pre-beamformed RF data were captured by a commercial ultrasound machine (SA-9900, Medison Corp., Seoul, Korea) from a tissue mimicking phantom (ATS Laboratories, Bridgeport, CT, USA). To quantify the performance of the proposed method, the information entropy contrast (IEC) value was measured. From the experiments, the proposed method provided IEC improvement by 2.8 over the conventional scan conversion method. These results indicate that the proposed new beamforming method could be used for enhancing the image quality in medical ultrasound imaging.

Paper Details

Date Published: 25 March 2011
PDF: 8 pages
Proc. SPIE 7968, Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy, 796814 (25 March 2011); doi: 10.1117/12.878958
Show Author Affiliations
YuHwa Lee, Sogang Univ. (Korea, Republic of)
Chunsheng Piao, Sogang Univ. (Korea, Republic of)
TaeWan Kim, Sogang Univ. (Korea, Republic of)
Jin Ho Chang, Sogang Univ. (Korea, Republic of)
Tai-Kyong Song, Sogang Univ. (Korea, Republic of)
Yangmo Yoo, Sogang Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 7968:
Medical Imaging 2011: Ultrasonic Imaging, Tomography, and Therapy
Jan D'hooge; Marvin M. Doyley, Editor(s)

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