Finet G, Cachard C, Delachartre P, Maurincomme E, Beaune J
Department of Hemodynamics, Hospices Civils de Lyon and Claude Bernard University, France.
Ultrasound Med Biol. 1998 Jul;24(6):793-802. doi: 10.1016/s0301-5629(98)00041-6.
Intravascular ultrasound imaging is able to provide direct images of the stent meshwork. However, a paradoxical question remains unanswered: Why is it not possible to correct or prevent implantation defects by ultrasound-guided implantation? We postulate that these discrepancies are due to image artifacts. We performed an in vitro experiment allowing detection, physical characterization, and computerized simulations of the various aspects of these artifacts. The width of the echo of a strut is variable, dependent on its distance from the transducer. The stent strut echo orientation is variable, and depends on the position of the transducer inside the stent. The stent contour image depends on the position of the transducer. In conclusion, knowledge of these stent intravascular ultrasound image artifacts enabled us to discriminate accurately between artifacts and real stent implantation defects, and are indispensable for accurate qualitative and quantitative analyses of stents.
血管内超声成像能够提供支架网络的直接图像。然而，一个自相矛盾的问题仍然没有答案：为什么无法通过超声引导植入来纠正或预防植入缺陷？我们推测这些差异是由图像伪像造成的。我们进行了一项体外实验，以检测、物理表征并对这些伪像的各个方面进行计算机模拟。支架支柱回声的宽度是可变的，取决于其与换能器的距离。支架支柱回声的方向是可变的，并且取决于换能器在支架内的位置。支架轮廓图像取决于换能器的位置。总之，了解这些支架血管内超声图像伪像使我们能够准确区分伪像和真正的支架植入缺陷，并且对于支架的准确定性和定量分析是必不可少的。
