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首页> 外文期刊>Ultrasonics, Ferroelectrics and Frequency Control, IEEE Transactions on >Sound-speed image reconstruction in sparse-aperture 3-D ultrasound transmission tomography
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Sound-speed image reconstruction in sparse-aperture 3-D ultrasound transmission tomography

机译：稀疏孔径3D超声透射层析成像中的声速图像重建

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摘要

The paper is focused on sound-speed image reconstruction in 3-D ultrasound transmission tomography. Along with ultrasound reflectivity and the attenuation coefficient, sound speed is an important parameter which is related to the type and pathological state of the imaged tissue. This is important in the intended application, breast cancer diagnosis. In contrast to 2-D ultrasound transmission tomography systems, a 3-D system can provide an isotropic spatial resolution in the x-, y-, and z-directions in reconstructed 3-D images of ultrasound parameters. Several challenges must, however, be addressed for 3-D systems-namely, a sparse transducer distribution, low signal-to-noise ratio, and higher computational complexity. These issues are addressed in terms of sound-speed image reconstruction, using edge-preserving regularized algebraic reconstruction in combination with synthetic aperture focusing. The critical points of the implementation are also discussed, because they are crucial to enable a complete 3-D image reconstruction. The methods were tested on a synthetic data set and on data sets measured with the Karlsruhe 3-D ultrasound computer tomography (USCT) I prototype using phantoms. The sound-speed estimates in the reconstructed volumes agreed with the reference values. The breast-phantom outlines and the lesion-mimicking objects were also detectable in the resulting sound-speed volumes.
机译：本文着重于3D超声透射层析成像中的声速图像重建。声速是超声反射率和衰减系数的重要参数，它与成像组织的类型和病理状态有关。这在预期的应用，乳腺癌诊断中很重要。与2-D超声传输层析成像系统相比，3-D系统可以在重建的超声参数的3-D图像中在x，y和z方向上提供各向同性的空间分辨率。然而，对于3-D系统，必须解决几个挑战，即，换能器分布稀疏，信噪比低以及计算复杂度高。这些问题是通过使用保留边缘的正则代数重建与合成孔径聚焦相结合的声速图像重建来解决的。还讨论了实现的关键点，因为它们对于实现完整的3D图像重建至关重要。该方法在合成数据集上进行测试，并在使用幻影的Karlsruhe 3-D超声计算机断层扫描（USCT）I原型上测量。重建体积中的声速估计与参考值一致。在产生的声速体积中，还可以检测到乳房幻影轮廓和模仿病变的物体。

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