Torso geometry reconstruction and body surface electrode localization using three-dimensional photography

Abstract

We conducted a prospective clinical study (n=14; 29% female) to assess the accuracy of a three-dimensional (3D) photography-based method of torso geometry reconstruction and body surface electrodes localization. The position of 74 body surface electrocardiographic (ECG) electrodes (diameter 5mm) was defined by two methods: 3D photography, and CT (marker diameter 2mm) or MRI (marker size 10×20mm) imaging. Bland-Altman analysis showed good agreement in X (bias -2.5 [95% limits of agreement (LoA) -19.5 to 14.3] mm), Y (bias -0.1 [95% LoA -14.1 to 13.9] mm), and Z coordinates (bias -0.8 [95% LoA -15.6 to 14.2] mm), as defined by the CT/MRI imaging, and 3D photography. The average Hausdorff distance between the two torso geometry reconstructions was 11.17±3.05mm. Thus, accurate torso geometry reconstruction using 3D photography is feasible. Body surface ECG electrodes coordinates as defined by the CT/MRI imaging, and 3D photography, are in good agreement.

Mechanisms of Arrhythmogenicity in Hypertrophic Cardiomyopathy: Insight From Non-invasive Electrocardiographic Imaging

“…Unipolar ECG potentials were recorded on the body surface using the ActiveTwo biopotential measurement system (BioSemi, Amsterdam, the Netherlands) with 128 Ag/AgCL electrodes (4 panels of 32 electrodes; each panel is arranged as four strips of 8-electrodes; diameter of the ECG electrodes 5 mm) (Perez- Alday et al, 2018). The sampling rate of the signal was 16,384 Hz; bandwidth DC-3,200 Hz.…”

“…The sampling rate of the signal was 16,384 Hz; bandwidth DC-3,200 Hz. ECG electrodes were localized by three-dimensional (3D) photography approach, using a PeacsKinect (Peacs BV, Arnhem, the Netherlands) and Kinect camera (Microsoft, Redmond, WA, United States) (Perez- Alday et al, 2018). For co-registration of torso images, five CMRor CT-specific markers were placed on each patient's chest to wear during scanning, to mark ECG electrode locations.…”

“…E/e' ratio 5.9 (1.5) 9.1 (3.4) 11.4 (5.7) 9.5 (4.0) both ventricular chambers. The 3D heart and torso meshes were reconstructed using a semi-automatic approach -image growing method of a continuous surface (Alday et al, 2015;Perez-Alday et al, 2018) from CMR/CT images using ITKsnap software (PICSL, United States) (Yushkevich et al, 2006). Each cardiac mesh was manually reviewed to ensure a continuous segmentation of epicardium and endocardium of both ventricular chambers and exclude atria chambers and papillary muscles.…”

“…Each cardiac mesh was manually reviewed to ensure a continuous segmentation of epicardium and endocardium of both ventricular chambers and exclude atria chambers and papillary muscles. Both torso meshes segmented by the 3D photography method and DICOM images were matched using the co-registered CMR/CT markers and electrode position, as previously described (Perez-Alday et al, 2018). The resolution of the cardiac mesh was 3.6 ± 0.5 mm with 3,992 ± 735 nodes.…”

Adaptive Cardiac Resynchronization Therapy Effect on Electrical Dyssynchrony (aCRT-ELSYNC): a randomized controlled trial

“…The study participants underwent recording of unipolar ECG potentials on the body surface using the ActiveTwo biopotential measurement system (BioSemi, Amsterdam, the Netherlands) with 128 Ag/AgCL electrodes (4 panels of 32 electrodes; each panel is arranged as four strips of 8-electrodes; diameter of the ECG electrodes 5 mm), 23 sampling rate 16,384 Hz and bandwidth DC-3,200 Hz. The localization of the electrodes was performed using a three dimensional (3D) photography approach using PeacsKinect (Peacs BV, Arnhem, the Netherlands), as previously described.…”