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Three-Dimensional Visualization of Myocardial Ischemia Based on the Standard Twelve-Lead Electrocardiogram.

Ma Y, Sheng Y, Ruixia T, Xun C - Comput Math Methods Med (2016)

Bottom Line: A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study.The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold.In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography.

View Article: PubMed Central - PubMed

Affiliation: Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, China.

ABSTRACT
A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study. The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold. Supposing that myocardial ischemia was uniform and continuous, the location and range of myocardial ischemia could be accurately calculated and visually displayed in a color-encoding way. The diagnoses of the same patient were highly consistent (kappa coefficient k = 0.9030) between the proposed method used by ordinary people lacking medical knowledge and the standard 12-lead ECG used by experienced cardiologists. In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography. The results of this study provide a new way to promote the development of the 3D visualization of the standard 12-lead ECG, which has a great help for inexperienced doctors or ordinary family members in their diagnosis of patients with myocardial ischemia.

No MeSH data available.


Related in: MedlinePlus

Front and back views of the digital 3D heart model.
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fig1: Front and back views of the digital 3D heart model.

Mentions: A good 3D heart model is essential for the correct 3D display of the information of myocardial ischemia in the 12-lead ECG [14–16]. To achieve that, we used a standard medical heart model and got the digital 3D heart model by reverse engineering. First, the standard medical heart model was scanned by using a high-resolution 3D scanner (OptimScan-5M, SHINING 3D, China). The specific modeling process is divided into three steps, namely, calibration, scanning, and postprocessing. In order to ensure the accuracy of the 3D scanner we must calibrate it with a standard three-dimensional sphere. The standard medical heart model needs to be coated with white reflective powder and then scanned, because some of the light absorbing surface material is not conducive to the acquisition of 3D scanning data and ultimately affects the accuracy of three-dimensional reconstruction. In addition, artificial marking points should also be used to help the 3D scanner correct the distortion of the reconstruction model. The upper semimodel and the complex shape of blood vessels were obtained by means of extrusion, and the lower semimodel including the apical part was obtained by curve rotation. The 3D reconstruction result of the scanner needed to be smoothed by the software Geomagic Studio, and finally the high quality digital 3D heart model was obtained as shown in Figure 1. The model surface is smooth, its structure and the distribution of the coronary artery are clear at a glance. The origin of the three-dimensional coordinate system was built at the center-point of the left ventricle; then the region of myocardial ischemia could be marked on the 3D heart model with UGNX software. The full data of the model are stored in a STL format file, in which the outline of the heart model consists of a set of triangular elements. Thus, the digital 3D heart model we created is the true representation of the human heart. Through software programming, one can easily change its viewing angle, partition a specific region on its surface, and change the color of its surface.


Three-Dimensional Visualization of Myocardial Ischemia Based on the Standard Twelve-Lead Electrocardiogram.

Ma Y, Sheng Y, Ruixia T, Xun C - Comput Math Methods Med (2016)

Front and back views of the digital 3D heart model.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940520&req=5

fig1: Front and back views of the digital 3D heart model.
Mentions: A good 3D heart model is essential for the correct 3D display of the information of myocardial ischemia in the 12-lead ECG [14–16]. To achieve that, we used a standard medical heart model and got the digital 3D heart model by reverse engineering. First, the standard medical heart model was scanned by using a high-resolution 3D scanner (OptimScan-5M, SHINING 3D, China). The specific modeling process is divided into three steps, namely, calibration, scanning, and postprocessing. In order to ensure the accuracy of the 3D scanner we must calibrate it with a standard three-dimensional sphere. The standard medical heart model needs to be coated with white reflective powder and then scanned, because some of the light absorbing surface material is not conducive to the acquisition of 3D scanning data and ultimately affects the accuracy of three-dimensional reconstruction. In addition, artificial marking points should also be used to help the 3D scanner correct the distortion of the reconstruction model. The upper semimodel and the complex shape of blood vessels were obtained by means of extrusion, and the lower semimodel including the apical part was obtained by curve rotation. The 3D reconstruction result of the scanner needed to be smoothed by the software Geomagic Studio, and finally the high quality digital 3D heart model was obtained as shown in Figure 1. The model surface is smooth, its structure and the distribution of the coronary artery are clear at a glance. The origin of the three-dimensional coordinate system was built at the center-point of the left ventricle; then the region of myocardial ischemia could be marked on the 3D heart model with UGNX software. The full data of the model are stored in a STL format file, in which the outline of the heart model consists of a set of triangular elements. Thus, the digital 3D heart model we created is the true representation of the human heart. Through software programming, one can easily change its viewing angle, partition a specific region on its surface, and change the color of its surface.

Bottom Line: A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study.The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold.In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography.

View Article: PubMed Central - PubMed

Affiliation: Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, China.

ABSTRACT
A novel method was proposed for transforming the ischemic information in the 12-lead electrocardiogram (ECG) into the pseudo-color pattern displayed on a 3D heart model based on the projection of a ST injury vector in this study. The projection of the ST injury vector at a point on the heart surface was used for identifying the presence of myocardial ischemia by the difference between the projection value and the detection threshold. Supposing that myocardial ischemia was uniform and continuous, the location and range of myocardial ischemia could be accurately calculated and visually displayed in a color-encoding way. The diagnoses of the same patient were highly consistent (kappa coefficient k = 0.9030) between the proposed method used by ordinary people lacking medical knowledge and the standard 12-lead ECG used by experienced cardiologists. In addition, the diagnostic accuracy of the proposed method was further confirmed by the coronary angiography. The results of this study provide a new way to promote the development of the 3D visualization of the standard 12-lead ECG, which has a great help for inexperienced doctors or ordinary family members in their diagnosis of patients with myocardial ischemia.

No MeSH data available.


Related in: MedlinePlus