Evaluation of phase aberration correction for a 3D USCT using a ray trace based simulation

Kretzek, E.; Dapp, R.; Zapf, Michael; Birk, Matthias; Ruiter, Nicole V.

doi:10.1109/ultsym.2013.0098

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…The factor ܽ ො൫‫‬ Ԧǡ ݁ ఫ ሬሬԦǡ ‫ݎ‬ ሬሬሬԦ൯ is applied to correct for the attenuation on the path. It is estimated from the attenuation map of the breast [6].…”

Section: E Image Reconstruction Methodsmentioning

confidence: 99%

First results of a clinical study with 3D ultrasound computer tomography

Ruiter

Zapf

Dapp

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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Figure 1. Left: KIT 3D USCT. Top right: Transducer aperture. Bottom right: 0.07 mm metal thread, photo (left) and maximum intensity projection of a reconstruction (right).Abstract-The KIT 3D USCT was tested in a pilot study on ten patients. The primary goals of the pilot study were to test the USCT device, the data acquisition protocols, the image reconstruction methods and the image fusion techniques in a clinical environment. The study was conducted successfully; the data acquisition could be carried out for all patients with an average imaging time of six minutes per breast. First reconstructions provide promising images. Overlaid volumes of the modalities show qualitative and quantitative information at a glance. The results led to further optimization of the system and the data acquisition protocol.

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Section: E Image Reconstruction Methodsmentioning

confidence: 99%

First results of a clinical study with 3D ultrasound computer tomography

Ruiter

Zapf

Dapp

et al. 2013

2013 IEEE International Ultrasonics Symposium (IUS)

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“…However, the main differences between aUs and UsT systems are the methods for data processing. In contrast to aUs, UsT data are processed with multi-directional algorithms for pulse-echo imaging, such as full-angle spatial compounding (Fasc) [10] or the synthetic aperture focusing technique (saFT) [11], [12], to reduce speckle pattern and to achieve an increased and isotropic resolution. Furthermore, with UsT systems, histological tissue parameters such as the speed of sound (sos) or attenuation distribution can be reconstructed with beamline-based transmission techniques from X-ray computed tomography (cT), such as the algebraic reconstruction technique (arT) [10] or diffraction/inverse methods [13], [14].…”

Section: Introductionmentioning

confidence: 99%

An ultrasound tomography system with polyvinyl alcohol (PVA) moldings for coupling: in vivo results for 3-D pulse-echo imaging of the female breast

Koch

Stiller

Lerch

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Full-angle spatial compounding (FASC) is a concept for pulse-echo imaging using an ultrasound tomography (UST) system. With FASC, resolution is increased and speckles are suppressed by averaging pulse-echo data from 360°. In vivo investigations have already shown a great potential for 2-D FASC in the female breast as well as for finger-joint imaging. However, providing a small number of images of parallel cross-sectional planes with enhanced image quality is not sufficient for diagnosis. Therefore, volume data (3-D) is needed. For this purpose, we further developed our UST add-on system to automatically rotate a motorized array (3-D probe) around the object of investigation. Full integration of external motor and ultrasound electronics control in a custom-made program allows acquisition of 3-D pulse-echo RF datasets within 10 min. In case of breast cancer imaging, this concept also enables imaging of near-thorax tissue regions which cannot be achieved by 2-D FASC. Furthermore, moldings made of polyvinyl alcohol hydrogel (PVA-H) have been developed as a new acoustic coupling concept. It has a great potential to replace the water bath technique in UST, which is a critical concept with respect to clinical investigations. In this contribution, we present in vivo results for 3-D FASC applied to imaging a female breast which has been placed in a PVA-H molding during data acquisition. An algorithm is described to compensate time-of-flight and consider refraction at the water-PVA-H molding and molding-tissue interfaces. Therefore, the mean speed of sound (SOS) for the breast tissue is estimated with an image-based method. Our results show that the PVA-H molding concept is applicable and feasible and delivers good results. 3-D FASC is superior to 2-D FASC and provides 3-D volume data at increased image quality.

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Study on Phase Correction for USCT Echo Image by Sound-Speed Image With Different Resolutions and Noise Levels

Yao

Tian

et al. 2019

IEEE Access

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Ultrasound computed tomography (USCT) is a promising technique for breast cancer detection. It provides three modalities: sound-speed-image (SSI), attenuation image, and echo image. In these modalities, the echo image is appropriate for the early detection of breast cancer, because it has high resolution. However, echo image reconstruction generally employs an assumed (pre-determined) sound speed to calculate the arrival time of echo signal, the mismatch between the assumed and real sound speeds results in phase aberration of echo signal, and the phase aberration further leads to a decline in image resolution and contrast. To correct the phase aberration, SSI can be used to provide sound speed information instead of the assumed speed, but the resolution of and noise level in SSI may affect the correction performance and echo image quality. In this article, we explored the effect of SSI resolution and the noise level on the resolution and contrast of echo image. First, USCT raw data was obtained by both numerical and experiment studies. Second, echo images were reconstructed by synthetic aperture (SA) technique, and their phase aberration was corrected by multi-stencils fast marching (MSFM) using SSIs with different resolutions and noise levels. Finally, the resolution and contrast of echo images were quantitatively evaluated. Both numerical simulation and phantom experiment demonstrated that the quality of echo images deteriorates as the SSI resolution decreases and the noise level increases. INDEX TERMS Echo image, phase aberration correction, sound speed image, ultrasound computed tomography.

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Evaluation of phase aberration correction for a 3D USCT using a ray trace based simulation

Cited by 5 publications

References 3 publications

First results of a clinical study with 3D ultrasound computer tomography

First results of a clinical study with 3D ultrasound computer tomography

An ultrasound tomography system with polyvinyl alcohol (PVA) moldings for coupling: in vivo results for 3-D pulse-echo imaging of the female breast

Study on Phase Correction for USCT Echo Image by Sound-Speed Image With Different Resolutions and Noise Levels

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