基于傅里叶图像构造的运动伪影研究

Jing Wang, Jian-yu Lu
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引用次数: 10

摘要

在本实验室开发的高帧率成像方法的基础上,提出了一种基于傅立叶的变帧率成像方法。该方法通过发射多个定向平面波或有限衍射光束来获取超声回波信号。图像是用傅里叶变换构造的。由于可以通过多次传输来获得一帧图像,以提高图像分辨率、视野和减少副瓣,因此研究运动对快速运动物体(如心脏二尖瓣)的方法的影响,并将结果与传统的延迟和方法进行比较是很重要的。本文采用点散射体和组织模拟体进行了体外实验。图像分辨率、旁瓣和对比度均可用于运动和静止物体。结果表明,除了传输次数大(低帧率)和传输深度小时,基于傅里叶的成像方法对运动不敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A study of motion artifacts of fourier-based image construction
Based on the high frame rate imaging method developed in our lab, a Fourier-based imaging method with a variable frame rate was developed recently. In this method, multiple steered plane waves or limited diffraction beams are transmitted to obtain ultrasound echo signals. Images are constructed with Fourier transformations. Because multiple transmissions may be used to obtain a frame of image to increase image resolution, field of view, and to reduce sidelobe, it is important to study the effects of motion on the method for fast moving objects such as the mitral valve of the heart, and compare the results with those obtained with the conventional delay-and- sum method. In this paper, in vitro experiments with a point scatterer and a tissue-mimicking phantom are performed. Image resolution, sidelobe, and contrast are obtained for both moving and stationary objects. Results show that the Fourier-based imaging method is not sensitive to the motion except when the number of transmissions is large (lower frame rate) and the depth is small.
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