Ms. Yuhwa Lee Profile

Yuhwa Lee

PhD Candidate at Sogang Univ

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Proceedings Article | 25 February 2012 Paper

New direct pixel beamforming based on phase rotation

Yonghyun Kim, Wooyoul Lee, Yuhwa Lee, Yangmo Yoo

Proceedings Volume 8320, 83201D (2012) https://doi.org/10.1117/12.912361

KEYWORDS: Ultrasonography, Image quality, Demodulation, In vitro testing, Image processing, Data acquisition, Finite impulse response filters, Imaging systems, Data conversion, Spatial resolution

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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.

Proceedings Article | 26 March 2011 Paper

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

YuHwa Lee, Chunsheng Piao, TaeWan Kim, Jin Ho Chang, Tai-Kyong Song, Yangmo Yoo

Proceedings Volume 7968, 796814 (2011) https://doi.org/10.1117/12.878958

KEYWORDS: Ultrasonography, Data conversion, Data acquisition, Raster graphics, Tissues, Medical imaging, Imaging systems, Signal processing, Transducers, Chemical elements

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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.

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