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25 February 2012 New direct pixel beamforming based on phase rotation
Yonghyun Kim, Wooyoul Lee, Yuhwa Lee, Yangmo Yoo
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Proceedings Volume 8320, Medical Imaging 2012: Ultrasonic Imaging, Tomography, and Therapy; 83201D (2012) https://doi.org/10.1117/12.912361
Event: SPIE Medical Imaging, 2012, San Diego, California, United States
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.
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Yonghyun Kim, Wooyoul Lee, Yuhwa Lee, and Yangmo Yoo "New direct pixel beamforming based on phase rotation", Proc. SPIE 8320, Medical Imaging 2012: Ultrasonic Imaging, Tomography, and Therapy, 83201D (25 February 2012); https://doi.org/10.1117/12.912361
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KEYWORDS
Ultrasonography
Demodulation
Image quality
Image processing
In vitro testing
Data acquisition
Finite impulse response filters
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