彩色多普勒超声帧差伪像的成因与特征探讨

本文目的在于探讨超声帧差伪像的形成原因与声像图特征。通过分析医用超声诊断仪器所采用的设计模型与人体组织声学特性之间存在的矛盾、探头振元数与物理通道数之间的匹配关系、2D图像与彩色多普勒图像在显示屏上的“实时”复合方式,揭示出在图像复合显示过程中,因帧频不同而导致的人体解剖结构与血流信号在时间、空间上“错位”而导致的伪像,阐明它具有的必然性、复合性、隐蔽性、低关注度特点,为仪器设计开发和超声医生在工作中及时识别帧差伪像,减少误诊,提供思路。

Discussion on the Causes and Characteristics of Color Doppler Ultrasound Frame Rates Difference Artifacts

The purpose of this paper is to investigate the causes and sonographic features of ultrasound frame rates difference artifacts.By analyzing the contradiction between the design model used in medical ultrasonic diagnostic equipment and the acoustic characteristics of human tissue,the matching relationship between the number of probe elements and the number of physical channels,and the“real-time”composite mode of 2D image and color Doppler image on the display screen,it is revealed that in the process of image composite display,the difference of frame rates leads to the“dislocation”of human anatomical structure and blood flow signal in time and space,which results in the artifacts of the image.It has the characteristics of inevitability,compound,concealment and low attention.This paper provides some ideas for the design and development of the instrument and the timely identification of the frame rates difference artifacts in order to reduce misdiagnosis.