Analysis Of Cardiac Wall Motion Research Articles

3次元スペックルトラッキング心エコー図法による心臓壁運動の解析

3次元スペックルトラッキング心エコー図法による心臓壁運動の解析

Visualization and Analysis of Myocardial Transition by Cardiac Ultrasound Images

In this paper we present a technique for visualization and analysis of cardiac wall motion, i.e., myocardial transition abnormalities, by digital cardiac ultrasound B-mode images. This technique is based on the correspondence analysis of characteristic points, called landmarks, extracted from endocardial boundary locations and can be used for wall motion analysis of the heart. The algorithm for this technique is that first, cardiac images are segmented into the myocardium and the background image using the gradient relaxation method and endocardial boundary locations are extracted. Next, the landmarks with geometric features are specified, and correspondence analysis is performed with landmarks of the next image. Functional diagnosis of moving organs can be performed by classifying the endocardial boundary into some appropriate colors and superimposing on the original B-mode image.

Spin-echo M-mode NMR imaging.

A nuclear magnetic resonance (NMR) imaging and display method for the observation of the continuous motion of objects is presented. By modifying a line scan technique, the spin-density distribution along a line is displayed in succession. Although spatial information is limited to only one dimension, the motion of the object is recorded at intervals of 55 ms by using a commercially available NMR imaging system. In a phantom study, this method yielded accurate velocity measurements along a single axis. When the method was applied to the human chest, an image analogous to that of M-mode echocardiography was obtained. This method, which can be called spin-echo M-mode NMR imaging, approaches the functional analysis of cardiac wall motion in regions where echocardiography is not possible. The effects of respiratory motion on the left ventricular wall were recorded in addition to its intrinsic contractile motion in an image obtained along a line parallel to the cranio-caudal axis of the body. The advantages of this method to assess cardiac wall motion in a patient with an arrhythmia were also demonstrated.

A technique for the visualization and analysis of cardiac wall motion by two-dimensional echocardiography

A technique is presented that can be used in the visualization and analysis of cardiac wall motion abnormalities by digital two-dimensional echocardiography. This technique is based on the use of a curvature function extracted from the endocardial boundary locations and can be used for shape or shape change analysis of the heart. The authors call the locations of high absolute curvature landmarks. Identification of landmarks on the endocardial boundary provides a simplified but powerful description of the boundary that allows visualization and analysis of wall motion. The simplification of the heart beating process is an excellent tool for the identification of infarcted areas of the heart.

Myocardial Wall Motion Evaluation Using Amplitude Frequency Spectral Analysis

Frequency spectral analysis of cardiac wall motion as calculated from the recorded video kymogram are demonstrated. Characteristic harmonics following the fundamental frequency of the cardiac rate have been demonstrated to have an alternating sequential energy distribution as measured from the free margin of the left ventricle of humans. The characteristic patterns occur in approximately 80% of the 50 patients evaluated. The correlation of these harmonics with physiologic events is not yet complete. Amplitude frequency spectral analysis offers an objective method for analysis of cardiac kymography not otherwise possible.