Full waveform inversion for ultrasound computed tomography with high-sensitivity scan method

Atsuro Suzuki; Yushi Tsubota; Wenjing Wu; Kazuhiro Yamanaka; Takahide Terada; Kenichi Kawabata

doi:10.1117/12.2512639

15 March 2019 Full waveform inversion for ultrasound computed tomography with high-sensitivity scan method

Atsuro Suzuki, Yushi Tsubota, Wenjing Wu, Kazuhiro Yamanaka, Takahide Terada, Kenichi Kawabata

Proceedings Volume 10955, Medical Imaging 2019: Ultrasonic Imaging and Tomography; 109550A (2019) https://doi.org/10.1117/12.2512639
Event: SPIE Medical Imaging, 2019, San Diego, California, United States

Abstract

For breast cancer imaging by ultrasound computed tomography (CT) without dependence on patient breast size, we previously developed a high-sensitivity scan method in which a virtual fan-beam (vfan-beam) is generated from ultrasound waves emitted from 128 sources with unique delay times. Full waveform inversion (FWI) with multiple sound sources has not been previously applied to ultrasound CT using a ring transducer array. We have now developed a FWI calculation process that enables a vfan-beam to generate accurate sound speed images. A vfan-beam is accurately modeled by positioning the 128 sources and considering the delay times. The performance of the FWI calculation process with a vfan-beam was evaluated using a prototype ultrasound CT. For a circular phantom, the spatial resolution of a FWI image obtained with a vfan-beam was better than that of a filtered back projection (FBP) image. The image contrast of the FWI calculation process with a vfan-beam was comparable to that of the process with a conventional fanbeam generated from a single source. For a high-attenuation ellipse phantom, the sound speed image obtained with a conventional fan-beam had severe artifacts due to the low signal to noise ratio (SNR). Using a vfan-beam reduced the number of artifacts in the images due to the higher SNR. The FWI calculation process with a vfan-beam visualized a 3 mm inclusion more clearly than the FBP process. A measurement study demonstrated that the FWI process with a vfanbeam with a high SNR reduced the number of artifacts in the sound speed images and improved the spatial resolution for a high-attenuation breast.

Conference Presentation

Citation Download Citation

Atsuro Suzuki, Yushi Tsubota, Wenjing Wu, Kazuhiro Yamanaka, Takahide Terada, and Kenichi Kawabata "Full waveform inversion for ultrasound computed tomography with high-sensitivity scan method", Proc. SPIE 10955, Medical Imaging 2019: Ultrasonic Imaging and Tomography, 109550A (15 March 2019); https://doi.org/10.1117/12.2512639

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