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首页> 外文会议>Conference on image processing >Fast image-based retrospective gating of cardiac x-ray images
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Fast image-based retrospective gating of cardiac x-ray images

机译：基于快速图像的心脏X射线图像追溯门控

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Placement of devices during interventional cardiology is hampered by the motion of the beating heart. One method for motion compensation in coronary fluoroscopy consists of the following steps: (1) acquire a sequence of images containing the moving device or vessel of interest; (2) track the object of interest offline for at least one complete heart cycle; (3) store the displacements as a function of cardiac phase as determined by electrocardiogram (ECG) gating; then during live acquisition (4) use ECG gating to determine the current phase; (5) look up the corresponding displacement; and (6) shift the displayed image to cancel the heart motion. We hypothesize that the cardiac phase can be computed directly from the images, thereby eliminating the need for ECG gating. We use the difference images between successive frames to compute a temporal 'sync' signal which can be used to determine cardiac phase. We acquire a reference sequence consisting of at least two heart beats so that a complete heartbeat of data is available centered at an arbitrary phase. This sequence is used to compute a reference sync signal and a lookup table of displacements. We have performed preliminary tests using 17 long x-ray sequences acquired during device placement in interventional coronary procedures. Images from approximately two heart cycles were used as the reference signal and performance was measured on the remaining frames. We evaluated four different synchronization metrics: (A) correlation of power of time difference images; (B) correlation of optical flow velocity; (C) the sum of correlations (A) and (B); and (D) sum of correlation (A) and correlation of optical flow velocity weighted by power of time difference. The best results were obtained with metrics (C) and (D), which each yielded correct registration within one frame for 92% of all frames.
机译：介入心脏病学期间装置的安装是由心脏跳动的运动受到阻碍。在冠状动脉透视运动补偿的一种方法包括下列步骤：（1）获取包含所述移动装置或感兴趣的血管图像的序列; （2）跟踪兴趣离线至少一个完整的心脏周期的对象; （3）存储的位移作为心脏相位的函数，如由心电图（ECG）门控确定;然后在现场采集（4）使用ECG门控，以确定当前相位; （5）中查找对应的位移;和（6）换档所显示的图像来取消心脏运动。我们假设心跳相位可以直接从图像进行计算，从而消除了心电门控的需要。我们使用连续帧之间的差图像，以计算时间，其可以被用来确定心脏相位“同步”信号。我们获得由至少两个心脏跳动，使数据的完整心跳可在任意相位中心的参考序列。该序列被用于计算一个基准同步信号和位移的查找表中。我们已经进行了使用在冠状动脉介入过程设备放置期间获得的17长的X射线序列的初步试验。从大约两心脏周期的图像被用作参考信号，并在剩余的帧测量的性能。我们评估了四种不同的同步指标：（A）的时间差的图像的功率的相关性; （B）光流速度的相关性; （C）的相关性（A）和（B）的总和;和（d）的相关性（A）和由时间差的功率加权的光流速度的相关性的总和。最好的结果，用指标（C）和（d），其每一个帧中产生了正确的登记的所有帧的92％而获得。

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