Pasterkamp G, van der Heiden M S, Post M J, Borst C, Gussenhoven E J, Pieterman H, van Urk H, Bom N
Heart Lung Institute, Utrecht University Hospital, The Netherlands.
Ultrasound Med Biol. 1995;21(2):149-56. doi: 10.1016/s0301-5629(94)00106-5.
With current 30-MHz intravascular ultrasound systems, flowing blood may cause considerable backscatter which in real-time images is characterized by dynamic speckle. However, in a single intravascular ultrasound image (still-frame) the discrimination between arterial lumen and wall may be difficult due to the frozen intraluminal speckle, particularly in the presence of dissections. We compared subtraction, averaging and saline flush as methods to improve the discrimination between arterial lumen and wall in a single image. The real-time images served as gold standard. In 22 patients who underwent peripheral balloon angioplasty, ultrasound images obtained from 84 sites were examined. The sensitivity and specificity of detecting dissections were in the subtraction image 85% and 100%, in the averaged image 57% and 96%, and in the saline flush image 58% and 86%, respectively. Subtraction is a promising method to outline the irregular lumen in a single image.
使用当前的30兆赫血管内超声系统时，流动的血液可能会引起相当多的反向散射，在实时图像中其特征为动态散斑。然而，在单幅血管内超声图像（静态帧）中，由于管腔内散斑冻结，特别是在存在夹层的情况下，区分动脉管腔和管壁可能会很困难。我们比较了减法、平均法和生理盐水冲洗法，作为改善单幅图像中动脉管腔和管壁区分的方法。实时图像作为金标准。在22例行外周球囊血管成形术的患者中，检查了从84个部位获得的超声图像。检测夹层的敏感性和特异性在减法图像中分别为85%和100%，在平均图像中分别为57%和96%，在生理盐水冲洗图像中分别为58%和86%。减法是一种在单幅图像中勾勒不规则管腔的有前景的方法。
