Image-based cardiac gating for three-dimensional intravascular ultrasound imaging
Image-based cardiac gating for three-dimensional intravascular ultrasound imaging
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DOI：
10.1016/j.ultrasmedbio.2004.08.025
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发表时间：
2005-01-01
影响因子：
2.9
通讯作者：
Fenster, A
中科院分区：
文献类型：
--
作者：
Nadkarni, SK;Boughner, D;Fenster, A
三维（3-D）血管内超声（US）或IVUS。提供了对冠状动脉壁和斑块组成的组织特征的有价值的洞察。然而.由于心脏运动和血管壁脉动引起的伪影限制了3-DIVUS图像中冠状动脉腔和斑块体积测量的准确性和可变性。ECG门控图像采集可以减少这些伪影，但它需要记录ECG信号，并可能增加图像采集时间。我们研究的目的是重建一个三维血管内超声图像，可以忽略心脏运动和血管脉动伪影。通过开发基于图像的门控方法来跟踪心动周期内的2-D IVUS图像。我们的方法涉及选择2-D血管内超声图像属于相同的心脏相位从一个连续采集的系列，通过跟踪不断变化的管腔轮廓在心动周期。使用定制冠状动脉血管体模的IVUS图像和患者图像对该算法进行了测试。在我们的研究中，使用图像门控方法实现的伪影减少在体外图像中> 86%，在体内图像中> 80%。我们的研究表明，IVUS图像的基于图像的门控提供了一种有用的方法，用于精确重建3-D IVUS图像，减少心脏运动伪影。(C)2005年世界医学生物学超声联合会。
Three-dimensional (3-D) intravascular ultrasound (US), or IVUS. provides valuable in-sight into the tissue characteristics of the coronary wall and plaque composition. However. artefacts due to cardiac motion and vessel wall pulsation limit the accuracy and variability of coronary lumen and plaque volume measurement in 3-D IVUS images. ECG-gated image acquisition can reduce these artefacts but it requires recording the ECG signal and may increase image acquisition time. The goal of our study was to reconstruct a 3-D IVUS image with negligible cardiac motion and vessel pulsation artefacts. by developing an image-based gating method to track 2-D IVUS images over the cardiac cycle. Our approach involved selecting 2-D IVUS images belonging to the same cardiac phase from an asynchronously-acquired series, by tracking the changing lumen contour over the cardiac cycle. The algorithm was tested with IVUS images of a custom-built coronary vessel phantom and with patient images. The artefact reduction achieved using the image-gating approach was > 86 % in the in vitro images and > 80 % in the in vivo images in our study. Our study shows that image-based gating of IVUS images provides a useful method for accurate reconstruction of 3-D IVUS images with reduced cardiac motion artefact. (C) 2005 World Federation for Ultrasound in Medicine Biology.