KEYWORDS: Ultrasonography, Computed tomography, Signal processing, Tomography, 3D image reconstruction, 3D image processing, Image transmission, Image quality, Computing systems
The ultrasound computed tomography system based on the ring probe adopts sequential single-slice scanning mode. The ring probe keeps stationary when the scan is in process; after the signals of one slice are captured, the ring probe steps along the elevation axis to scan the next slice. The scanning process needs to step and stop repeatedly, and the scanning time is relatively long. Also, the lack of signals between tomographic image slices may result in missed diagnosis. This paper proposes a new spiral synthetic aperture method for ultrasound tomographic volume imaging. The ring probe moves along the elevation axis at a certain speed, while the transmitting and receiving array elements are switched electronically. Therefore, “spiral” transmitting aperture and receiving aperture are formed, and continuous three-dimensional spatial spiral data are collected to directly reconstruct the three-dimensional volume image. Preliminary experimental result shows that this method can shorten the scanning time and improve image quality in the elevation direction.
Ultrasound computed tomography (USCT) is a 3D imaging tool, especially for breast screening. Sound-speed tomography as one imaging modal of USCT is widely studied by researchers because of its great clinical potential for early breast cancer detection. Sound-speed reconstruction methods include ray-based methods and wave-based methods. In this study, a ray-based method for sound speed reconstruction: Fresnel volume tomography (FVT) is implemented. We use Limitedmemory Broyden–Fletcher–Goldfarb–Shanno (L-BFGS) optimization algorithm to solve the large and sparse equation for the inversion step. Considering the great computation burden in the L-BFGS inversion process, two kinds of acceleration schemes: CPU parallel and GPU parallel schemes are used and evaluated by in vitro experiment. The corresponding acceleration ratios are 5.3 and 18.6 for the 512×512 sound speed image reconstruction, compared to CPU serial computation.
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