Santosh K, Tobocman W, Haacke E M, Boada F
Department of Radiology, Case Western Reserve University, Cleveland, OH 44106.
Ultrasonics. 1990 Jan;28(1):40-9. doi: 10.1016/0041-624x(80)90007-4.
In the first article of this series it was shown that the use of inverse scattering theory to analyse ultrasound reflections could provide high resolution images of the acoustic impedance profile of the retina. Unlike the retina, most tissue structures of interest, like small tumours and arterial plaque deposits, are shielded from view by intervening layers of tissue of appreciable acoustic impedance and attenuation. By analysing a one-dimensional model for a plaque deposit on the wall of a carotid artery embedded in a 5 cm thick layer of tissue, we demonstrate that a relatively high quality image can be recovered when compensation for the attenuation of the intervening tissue is made. We observe that because of the dearth of low frequency power in the recovered signal of ultrasound transducers, it is important that the field of view imaged is not taken to be too large. We compare the exact iterative distorted wave Born approximation inverse scattering method with the approximate but computationally faster plane wave Born approximation method and find that they give images of comparable quality for this model.
在本系列的第一篇文章中表明，使用逆散射理论分析超声反射可以提供视网膜声阻抗剖面的高分辨率图像。与视网膜不同，大多数感兴趣的组织结构，如小肿瘤和动脉斑块沉积物，被具有可观声阻抗和衰减的中间组织层遮挡而无法看到。通过分析一个嵌入在5厘米厚组织层中的颈动脉壁上斑块沉积物的一维模型，我们证明，当对中间组织的衰减进行补偿时，可以恢复相对高质量的图像。我们观察到，由于超声换能器恢复信号中低频功率的缺乏，成像的视野不能太大，这一点很重要。我们将精确的迭代扭曲波玻恩近似逆散射方法与近似但计算速度更快的平面波玻恩近似方法进行了比较，发现对于该模型，它们给出的图像质量相当。
