Accesso libero

Improved estimation of left ventricular volume from electric field modeling

Leonie Korn

Leonie Korn

Medical Information Technology, RWTH Aachen UniversityAachen, Germany
Cerca questo autore su
Sciendo|Google Scholar
Korn, Leonie
, 
Stephan Dahlmanns

Stephan Dahlmanns

Medical Information Technology, RWTH Aachen UniversityAachen, Germany
Cerca questo autore su
Sciendo|Google Scholar
Dahlmanns, Stephan
, 
Steffen Leonhardt

Steffen Leonhardt

Medical Information Technology, RWTH Aachen UniversityAachen, Germany
Cerca questo autore su
Sciendo|Google Scholar
Leonhardt, Steffen
 e 
Marian Walter

Marian Walter

Medical Information Technology, RWTH Aachen UniversityAachen, Germany
Cerca questo autore su
Sciendo|Google Scholar
Walter, Marian
  
27 dic 2021
Improved estimation of left ventricular volume from electric field modeling's Cover Image
INFORMAZIONI SU QUESTO ARTICOLO
Articolo precedente
Articolo Successivo
Cita
Scarica la copertina
Pubblicato online: 27 dic 2021
Pagine: 125 - 134
Ricevuto: 16 giu 2021
DOI: https://doi.org/10.2478/joeb-2021-0015
Parole chiave
© 2021 Leonie Korn, Stephan Dahlmanns, Steffen Leonhardt and Marian Walter, published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1

Electric field distribution of to spheres with opposite charges Q (red) and -Q (blue). The measurement electrodes (green) are distanced by L. Background tissue (σba = 0) is assumed.
Electric field distribution of to spheres with opposite charges Q (red) and -Q (blue). The measurement electrodes (green) are distanced by L. Background tissue (σba = 0) is assumed.

Figure 2

Electric field distribution by applying the voltages -V0 (red) on a sphere and V0′=+V0 $V_{0}^{\prime }=+{{V}_{0}}$on a spare charge plate (blue). The measurement electrodes (green) are distanced by L. Muscle tissue (σm) with a thickness of b and background tissue (σba) are modeled.
Electric field distribution by applying the voltages -V0 (red) on a sphere and V0′=+V0 $V_{0}^{\prime }=+{{V}_{0}}$on a spare charge plate (blue). The measurement electrodes (green) are distanced by L. Muscle tissue (σm) with a thickness of b and background tissue (σba) are modeled.

Figure 3

Left: electric field distribution of the injection at the outer electrodes with distance d. Middle: electric field distribution of the injection at the inner electrodes with distance L. Right: electric field distribution considering both the injection and the measurement field according to lead field theory.
Left: electric field distribution of the injection at the outer electrodes with distance d. Middle: electric field distribution of the injection at the inner electrodes with distance L. Right: electric field distribution considering both the injection and the measurement field according to lead field theory.

Figure 4

Left: five cylindrical glass containers representing simplistic volumes to test the measurement system and calculation methods. 1: radius 13.3 mm, 2: radius 17.5 mm, 3: radius 32.8 mm, 4: radius 38.6 mm, 5: radius 50.4 mm. Right: close-up on the measurement catheter and a possible cascaded measurement configuration.
Left: five cylindrical glass containers representing simplistic volumes to test the measurement system and calculation methods. 1: radius 13.3 mm, 2: radius 17.5 mm, 3: radius 32.8 mm, 4: radius 38.6 mm, 5: radius 50.4 mm. Right: close-up on the measurement catheter and a possible cascaded measurement configuration.

Figure 5

a) Left ventricular in-vitro phantoms made from silicone (left: carbon, right: pure), b) C-arm with manual test bench to measure phantom dimension, c) Cross-sectional areas obtained from CT measurements at the center electrode pair, adapted from [32].
a) Left ventricular in-vitro phantoms made from silicone (left: carbon, right: pure), b) C-arm with manual test bench to measure phantom dimension, c) Cross-sectional areas obtained from CT measurements at the center electrode pair, adapted from [32].

Figure 6

Estimated radii using the classical Wei, the plate, and the lead ACM compared to the known radii of the cylinders (Data). Left: conductivity of saline solution σ1 = 1.69 S/m, right: conductivity of saline solution σ2 = 0.62 S/m.
Estimated radii using the classical Wei, the plate, and the lead ACM compared to the known radii of the cylinders (Data). Left: conductivity of saline solution σ1 = 1.69 S/m, right: conductivity of saline solution σ2 = 0.62 S/m.

Figure 7

Estimated radii by the ACMs (Wei, Plate, Lead) obtained from the conductances measured inside the in-vitro phantoms compared to reference radii (Data). Left: insulating phantom of pure silicone, right: silicone phantom enriched with carbon.
Estimated radii by the ACMs (Wei, Plate, Lead) obtained from the conductances measured inside the in-vitro phantoms compared to reference radii (Data). Left: insulating phantom of pure silicone, right: silicone phantom enriched with carbon.

Measured volumes inside the silicone ventricle from CT measurements_ Cross-sectional areas obtained between the center electrode pair_ Estimated equivalent center radius_

Step Volume (mL) Area (mm2) Radius (mm)
1 117.90 1248.84 19.94
2 107.12 1022.55 18.04
3 97.96 855.50 16.50
4 87.20 683.15 14.75
5 76.84 506.83 12.70
6 69.46 401.12 11.30
Lingua:
Inglese
Frequenza di pubblicazione:
1 volte all'anno
Argomenti della rivista:
Ingegneria, Bioingegneria ed ingegneria biomedicale, Elettronica biomedicale, Scienze biologiche, Biofisica, Medicina, Ingegneria biomedica, Fisica, Spettroscopia e metrologia
Feed RSS della rivista