Peng Hu, Han Xuemei, Du Hongwei, Wang Jing, Lu Jianyu, Feng Huanqing
The 23rd Department, The University of Science and Technology of China, Hefei 230026, China.
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi. 2006 Feb;23(1):25-9.
The high frame rate (HFR) ultrasonic imaging system, which is developed with limited diffraction beams, constructs images at a high frame rate. However the rectangular imaging area, to some extent, restricts the far field imaging information. At the same time, because of one transmission for constructing image, the system suffers from low SNR. In this paper we present a computationally efficient method to construct sector mode image and to increase the SNR in HFR system. The method uses Golay complementary sequence as excitation to realize two transmission events. Each event simultaneously transmits two plane waves with different transmission angle. Then the received echo signals related to different angle are separated according to orthogonality of Golay complementary sequence and used to construct two images of different area by HFR method. Finally the two images are synthesized to one frame of sector mode image.
基于有限衍射波束开发的高帧率（HFR）超声成像系统能够以高帧率构建图像。然而，矩形成像区域在一定程度上限制了远场成像信息。同时，由于构建图像只需一次发射，该系统的信噪比（SNR）较低。在本文中，我们提出了一种计算效率高的方法来构建扇形模式图像并提高HFR系统的SNR。该方法使用戈莱互补序列作为激励来实现两次发射事件。每次事件同时发射两个具有不同发射角度的平面波。然后，根据戈莱互补序列的正交性分离与不同角度相关的接收回波信号，并通过HFR方法用于构建两个不同区域的图像。最后，将这两个图像合成为一帧扇形模式图像。
