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Interactive graphics system for locating plunge electrodes in cardiac MRI images

机译：用于在心脏MRI图像中定位插入电极的交互式图形系统

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Understanding the mechanisms of ventricular fibrillation and defibrillation requires analysis of epicardial and endocardial potentials throughout the heart. Plunge electrodes permit recording of cardiac potentials at epicardial and endocardial sites, and allow determination of electrical gradients. They also enable us to determine the arrhythmia recurrence sites following failed defibrillation; these sites may be epicardial or endocardial. Therefore, it is necessary to relate the position of the plunge electrodes to the cardiac geometry. We have developed an interactive, computer graphics based system that allows us to locate plunge electrodes on digitized MRI slices of a heart. The system, which can work with any type of image, allows us to identify the epicardial and endocardial points of each plunge electrode on the different MRI slices. Up to 128 different plunge electrodes may be identified to the system. Normalized 3-D coordinates for each epicardial and endocardial electrode point are computed and stored in data files on the computer. Geometry information obtained from this system permits a more thorough understanding of the electrical signals recorded by the plunge electrodes. This information can be used in the study of cardiac excitation and arrhythmias and could help in the development of a more effective lead system for ventricular defibrillation.
机译：理解心室颤动和除颤机制需要分析整个心脏的心外膜和心内膜势。暴力电极允许在心外膜和外心表位点进行心脏势，并允许确定电梯度。他们还使我们能够确定失败的除颤后的心律失常复发遗址;这些位点可能是心外膜或心外膜。因此，有必要将插入电极的位置与心脏几何相关联。我们开发了一个基于计算机图形的交互式，允许我们在数字化的MRI切片上找到插入电极。可以使用任何类型图像的系统允许我们识别不同MRI切片上的每个插入电极的外心和内膜点。可以识别到系统上最多128个不同的泄漏电极。计算每个外膜和内压电极点的归一化3-D坐标并存储在计算机上的数据文件中。从该系统获得的几何信息允许更全面地了解由插入电极记录的电信号。该信息可用于心脏激发和心律失常的研究，可以帮助开发一种更有效的心室除颤的铅系统。

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