Fig. 1
Transesophageal echocardiography (TEE), computed tomography (CT), and saline bolus-based 3D electrical impedance tomography (EIT) results. The EIT measurement system adopted alternating currents with a rms of 2 mA and a frequency of 20 kHz. Voltages were measured at a rate of 20 frames per second. Details of the injection-measurement pattern can be found in [
2] (IV-A). The image reconstruction algorithm was run on one NVIDIA Tesla V100 GPU card and the image was produced at a rate of 0.125 frames per second.
A TEE image of the mid-esophageal bicaval view. The red arrow indicates a massive embolism in the right atrium.
B TEE image of the mid-esophageal ascending aortic short-axis view. The red arrow demonstrates that the color Doppler found no blood perfusion signal in the right pulmonary artery.
C Chest CT image indicated that the lung was almost normal.
D Lung ventilation image of EIT in coronary, sagittal, and axial planes with low-ventilated regions marked in dark blue and high-ventilated regions in light grey.
E Lung perfusion image of EIT in coronary, sagittal, and axial planes. Regions with low perfusion are displayed in dark red and high perfusion in white.
F Ventilation/perfusion (V/Q) image of EIT in coronary, sagittal, and axial planes demonstrating the regional V/Q distribution. Regions of dead space (high ventilation and low perfusion) are shown in dark gray. Shunt regions (low ventilation and high perfusion) are marked in red. Areas of matched V/Q ratios are presented in yellow. The cardiac output (2.5 L/min) and minute volume (6 L) were included in the V/Q calculation according to François Perier’s study [
3].
G The percentage of deadspace, shunt, and V/Q match pixels in 3D global and different planes.
LA Left atrium,
RA Right atrium,
RPA Right pulmonary artery,
AO Aorta,
MPA Main pulmonary artery,
Axi Axial plane,
Cor Coronary plane,
Right Sag Right sagittal plane,
Left Sag Left sagittal plane