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

2018 ◽  
Vol 51 (1) ◽  
pp. 60-67 ◽  
Author(s):  
Erick A. Perez-Alday ◽  
Jason A. Thomas ◽  
Muammar Kabir ◽  
Golriz Sedaghat ◽  
Nichole Rogovoy ◽  
...  
Keyword(s):  
Body Surface ◽  
Three Dimensional ◽  
Surface Electrode ◽  
Geometry Reconstruction ◽  
Electrode Localization

Three-Dimensional Reconstruction of Native Androctonus Australis Hemocyanin

1990 ◽  
Vol 48 (1) ◽  
pp. 452-453
Author(s):  
Nicolas Boisset ◽  
Jean-Christophe Taveau ◽  
Jean Lamy ◽  
Terence Wagenknecht ◽  
Michael Radermacher ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Solid Body ◽  
Body Surface ◽  
Three Dimensional ◽  
Staining Technique ◽  
Three Dimensional Reconstruction ◽  
Dimensional Reconstruction ◽  
View Reconstruction ◽  
Surface Representations ◽  
Top View

Hemocyanin, the respiratory pigment of the scorpion Androctonus australis is composed of 24 kidney shaped subunits. A model of architecture supported by many indirect arguments has been deduced from electron microscopy (EM) and immuno-EM. To ascertain, the disposition of the subunits within the oligomer, the 24mer was submitted to three-dimensional reconstruction by the method of single-exposure random-conical tilt series.A sample of native hemocyanin, prepared with the double layer negative staining technique, was observed by transmisson electron microscopy under low-dose conditions. Six 3D-reconstructions were carried out indenpendently from top, side and 45°views. The results are composed of solid-body surface representations, and slices extracted from the reconstruction volume.The main two characters of the molecule previously reported by Van Heel and Frank, were constantly found in the solid-body surface representations. These features are the presence of two different faces called flip and flop and a rocking of the molecule around an axis passing through diagonnally opposed hexamers. Furthermore, in the solid-body surface of the top view reconstruction, the positions and orientations of the bridges connecting the half molecules were found in excellent agreement with those predicted by the model.

Noninvasive three-dimensional electrocardiographic imaging of ventricular activation sequence

2005 ◽  
Vol 289 (6) ◽  
pp. H2724-H2732 ◽  
Author(s):  
Xin Zhang ◽  
Indiresha Ramachandra ◽  
Zhongming Liu ◽  
Basharat Muneer ◽  
Steven M. Pogwizd ◽  
...  
Keyword(s):  
Surface Potential ◽  
Body Surface ◽  
Cardiac Arrhythmias ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Electrocardiographic Imaging ◽  
Ventricular Activation ◽  
Body Surface Potential ◽  
Life Threatening ◽  
Activation Sequence

Imaging the myocardial activation sequence is critical for improved diagnosis and treatment of life-threatening cardiac arrhythmias. It is desirable to reveal the underlying cardiac electrical activity throughout the three-dimensional (3-D) myocardium (rather than just the endocardial or epicardial surface) from noninvasive body surface potential measurements. A new 3-D electrocardiographic imaging technique (3-DEIT) based on the boundary element method (BEM) and multiobjective nonlinear optimization has been applied to reconstruct the cardiac activation sequences from body surface potential maps. Ultrafast computerized tomography scanning was performed for subsequent construction of the torso and heart models. Experimental studies were then conducted, during left and right ventricular pacing, in which noninvasive assessment of ventricular activation sequence by means of 3-DEIT was performed simultaneously with 3-D intracardiac mapping (up to 200 intramural sites) using specially designed plunge-needle electrodes in closed-chest rabbits. Estimated activation sequences from 3-DEIT were in good agreement with those constructed from simultaneously recorded intracardiac electrograms in the same animals. Averaged over 100 paced beats (from a total of 10 pacing sites), total activation times were comparable (53.3 ± 8.1 vs. 49.8 ± 5.2 ms), the localization error of site of initiation of activation was 5.73 ± 1.77 mm, and the relative error between the estimated and measured activation sequences was 0.32 ± 0.06. The present experimental results demonstrate that the 3-D paced ventricular activation sequence can be reconstructed by using noninvasive multisite body surface electrocardiographic measurements and imaging of heart-torso geometry. This new 3-D electrocardiographic imaging modality has the potential to guide catheter-based ablative interventions for the treatment of life-threatening cardiac arrhythmias.

Mining Three-Dimensional Anthropometric Body Surface Scanning Data for Hypertension Detection

2007 ◽  
Vol 11 (3) ◽  
pp. 264-273 ◽  
Author(s):  
Chaochang Chiu ◽  
Kuang-Hung Hsu ◽  
Pei-Lun Hsu ◽  
Chi-I Hsu ◽  
Po-Chi Lee ◽  
...  
Keyword(s):  
Body Surface ◽  
Three Dimensional ◽  
Surface Scanning ◽  
Hypertension Detection

scholarly journals The validation study on a three-dimensional burn estimation smart-phone application: accurate, free and fast?

2018 ◽  
Vol 6 ◽  
Author(s):  
A. K. W. Cheah ◽  
T. Kangkorn ◽  
E. H. Tan ◽  
M. L. Loo ◽  
S. J. Chong
Keyword(s):  
Surface Area ◽  
Body Surface Area ◽  
Body Surface ◽  
Validation Study ◽  
Total Body Surface Area ◽  
Three Dimensional ◽  
Smart Phone ◽  
Conventional Methods ◽  
Total Body ◽  
Smart Phone Application

Abstract Background Accurate total body surface area burned (TBSAB) estimation is a crucial aspect of early burn management. It helps guide resuscitation and is essential in the calculation of fluid requirements. Conventional methods of estimation can often lead to large discrepancies in burn percentage estimation. We aim to compare a new method of TBSAB estimation using a three-dimensional smart-phone application named 3D Burn Resuscitation (3D Burn) against conventional methods of estimation—Rule of Palm, Rule of Nines and the Lund and Browder chart. Methods Three volunteer subjects were moulaged with simulated burn injuries of 25%, 30% and 35% total body surface area (TBSA), respectively. Various healthcare workers were invited to use both the 3D Burn application as well as the conventional methods stated above to estimate the volunteer subjects’ burn percentages. Results Collective relative estimations across the groups showed that when used, the Rule of Palm, Rule of Nines and the Lund and Browder chart all over-estimated burns area by an average of 10.6%, 19.7%, and 8.3% TBSA, respectively, while the 3D Burn application under-estimated burns by an average of 1.9%. There was a statistically significant difference between the 3D Burn application estimations versus all three other modalities (p < 0.05). Time of using the application was found to be significantly longer than traditional methods of estimation. Conclusions The 3D Burn application, although slower, allowed more accurate TBSAB measurements when compared to conventional methods. The validation study has shown that the 3D Burn application is useful in improving the accuracy of TBSAB measurement. Further studies are warranted, and there are plans to repeat the above study in a different centre overseas as part of a multi-centre study, with a view of progressing to a prospective study that compares the accuracy of the 3D Burn application against conventional methods on actual burn patients.

Three-Dimensional Compensation for Minimizing Heating of the Ion in Surface-Electrode Trap

2020 ◽  
Vol 37 (5) ◽  
pp. 053701 ◽  
Author(s):  
Ji Li ◽  
Liang Chen ◽  
Yi-He Chen ◽  
Zhi-Chao Liu ◽  
Hang Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Surface Electrode

Three-dimensional Input of Body Surface Data Using a Laser Light Scanner

1988 ◽  
Vol 21 (1) ◽  
pp. 38-45 ◽  
Author(s):  
Court B. Cutting ◽  
Joseph G. McCarthy ◽  
Daniel B. Karron
Keyword(s):  
Body Surface ◽  
Laser Light ◽  
Three Dimensional ◽  
Surface Data

Development of Three-dimensional Body Scan Method in Measuring Body Surface

2006 ◽  
Vol 76 (9) ◽  
pp. 674-686 ◽  
Author(s):  
M.H. Kim ◽  
Y.J. Nam ◽  
D.H. Cho ◽  
T.J. Kang
Keyword(s):  
Body Surface ◽  
Three Dimensional ◽  
Body Scan

THREE‐DIMENSIONAL RESISTIVITY AND INDUCED‐POLARIZATION MODELING USING BURIED ELECTRODES

Geophysics ◽  
1977 ◽  
Vol 42 (5) ◽  
pp. 1006-1019 ◽  
Author(s):  
Jeffrey J. Daniels
Keyword(s):  
Electrical Properties ◽  
Apparent Resistivity ◽  
Three Dimensional ◽  
Equipotential Surface ◽  
Induced Polarization ◽  
The Body ◽  
Surface Electrode ◽  
Surface Integral ◽  
Drill Holes ◽  
Resistivity Modeling

The three‐dimensional induced‐polarization and resistivity‐modeling problem for buried source and receiver electrodes is solved by using a modified form of Barnett’s surface‐integral technique originally developed for surface‐electrode configurations. Six different buried electrode configurations are considered in this study: three types of hole‐to‐hole configurations, hole‐to‐surface and surface‐to‐hole configurations, and the single hole (bipole‐bipole) configuration. Results show there is no “best” method for all situations encountered in the field. The choice of method depends upon depth of the body, spacing of drill holes, and electrical properties of the body. In hole‐to‐hole measurements, the geometric factor (necessary for the computation of the apparent resistivity) becomes infinitely large or infinitely small whenever the receiving bipole is placed at a depth so that it lies on a zero equipotential surface. This leads to the formation of apparent resistivity anomalies that are extremely sensitive to the presence of the body but that are also complicated and not easily correlated with the position of the body. It is shown that diagnostic and easily interpretable anomalies are obtained by selecting the proper source‐receiver configurations.

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