Finet G, Tabib A, Maurincomme E, Douek P, Roriz R, Amiel M, Beaune J
Service d'hémodynamique, Hôpital cardiologique et pneumologique, BP Lyon-Monchat.
Arch Mal Coeur Vaiss. 1994 Feb;87(2):271-80.
Intravascular ultrasound catheters provide cross-sectional images of vessel walls and surrounding tissues with rotating transducers, and the behavior of ultrasound in heterogeneous media both cause degradation of image quality. Qualitative and quantitative analyses of in vivo studies are operator-dependent and limited by artifacts. We investigated these limitations by an in vitro study on plexiglass phantoms and segments of fresh arteries. We observed, analyzed and interpreted the most specific reasons for image artifacts: geometric distortions, the point spread function of the imaging system and the near field effects. Various practical implications have resulted from this study. Knowledge of the most obvious pitfalls will enable the user to obtain maximum benefits from intravascular ultrasound imaging, and to appreciate its limitations.
血管内超声导管通过旋转换能器提供血管壁和周围组织的横截面图像，而超声在异质介质中的行为都会导致图像质量下降。体内研究的定性和定量分析依赖于操作者，且受伪像限制。我们通过对有机玻璃模型和新鲜动脉段进行体外研究来探究这些局限性。我们观察、分析并解释了图像伪像最具体的原因：几何畸变、成像系统的点扩散函数和近场效应。这项研究产生了各种实际影响。了解最明显的缺陷将使用户能够从血管内超声成像中获得最大益处，并认识到其局限性。
