1 April 2016 Spatial smoothing coherence factor for ultrasound computed tomography
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In recent years, many research studies have been carried out on ultrasound computed tomography (USCT) for its application prospect in early diagnosis of breast cancer. This paper applies four kinds of coherence-factor-like beamforming methods to improve the image quality of synthetic aperture focusing method for USCT, including the coherence-factor (CF), the phase coherence factor (PCF), the sign coherence factor (SCF) and the spatial smoothing coherence factor (SSCF) (proposed in our previous work). The performance of these methods was tested with simulated raw data which were generated by the ultrasound simulation software PZFlex 2014. The simulated phantom was set to be water of 4cm diameter with three nylon objects of different diameters inside. The ring-type transducer had 72 elements with a center frequency of 1MHz. The results show that all the methods can reveal the biggest nylon circle with the radius of 2.5mm. SSCF gets the highest SNR among the proposed methods and provides a more homogenous background. None of these methods can reveal the two smaller nylon circles with the radius of 0.75mm and 0.25mm. This may be due to the small number of elements.
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Cuijuan Lou, Cuijuan Lou, Mengling Xu, Mengling Xu, Mingyue Ding, Mingyue Ding, Ming Yuchi, Ming Yuchi, } "Spatial smoothing coherence factor for ultrasound computed tomography", Proc. SPIE 9790, Medical Imaging 2016: Ultrasonic Imaging and Tomography, 979008 (1 April 2016); doi: 10.1117/12.2216191; https://doi.org/10.1117/12.2216191

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