Automatic recognition processing in ultrasound computed tomography of bone

Fradi Marwa; Wajih Elhadj Youssef; Mohsen Machhout; Philippe Petit; Cécile Baron; Régine Guillermin; Philippe Lasaygues

doi:10.1117/12.2506473

15 March 2019 Automatic recognition processing in ultrasound computed tomography of bone

Fradi Marwa, Wajih Elhadj Youssef, Mohsen Machhout, Philippe Petit, Cécile Baron, Régine Guillermin, Philippe Lasaygues

Proceedings Volume 10955, Medical Imaging 2019: Ultrasonic Imaging and Tomography; 1095514 (2019) https://doi.org/10.1117/12.2506473
Event: SPIE Medical Imaging, 2019, San Diego, California, United States

Abstract

Ultrasound Computed Tomography (USCT) of soft biological tissues today provides images with a high-level of resolution. The signal acquisition system using multichannel and/or multifrequency arrays performs in circular mode and the main (linear) inversion algorithms are based on compression wave propagation modeling. The main limits of these methods for bone imaging are due to the large impedance contrast between tissues, and to propagative phenomena generated through periosteal interfaces (mode conversion, attenuation). The linear inversion methods fail to provide high-level resolution images. Despite their performance and robustness, the non-linear methods are still today unsuitable for clinical applications because of the high computation time required. However, in the special case of children bone imaging, acquisition steps must be as fast as possible, with short-time exposure and low-intensity sonication. In this context, we have developed a fast-acquisition setup (1 sec.) based on a cylindrical-focusing ring antenna, and a protocol (< 5 sec.) using classical Born approximation and spatial Fourier transform. Unfortunately, the result today is a poor contrast-to-noise ratio (CNR) image. Previous work done to improve CNR used signal and image processing. This work focuses on this last point, and an automatic edge detection procedure, using Haar wavelet 2D-decompositon, combining k-means and Ostu algorithms. Results will be presented on ex vivo real bone samples and on geometrical mimicking bone phantom (SawbonesTM). An example of bone defect imaging will be presented and discussed.

Citation Download Citation

Fradi Marwa, Wajih Elhadj Youssef, Mohsen Machhout, Philippe Petit, Cécile Baron, Régine Guillermin, and Philippe Lasaygues "Automatic recognition processing in ultrasound computed tomography of bone", Proc. SPIE 10955, Medical Imaging 2019: Ultrasonic Imaging and Tomography, 1095514 (15 March 2019); https://doi.org/10.1117/12.2506473

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