Electrical Impedance Tomography (EIT) is an imaging method in which contact electrodes measure electrical resistance in the tissues. Its spatial resolution and amount of measurement information are low. While EIT can confirm the location of the lesion area, the accuracy of the measurement is very low. The amount of interference that occurs during measurement, the roughness of the surface of the skin, and the amount of pressure that is applied during measurement, are all significant factors that can affect the accuracy of the measurement. Further, the measurement accuracy is also impacted by low stability and sensitivity. However, commercial electrical impedance tomography systems have been developed by many companies and have gained popularity among clinical researchers.
Lung function imaging in newborns
Electrical Impedance Tomography, or EIT, is a method that measures the electrical impedance of the lungs in live patients. This type of imaging is not invasive. The technique can be performed in newborns at the bedside. The LuMon System, manufactured by Sentec in Landquart, Switzerland, combines a pediatric EIT belt with a LuMonConnector. The system measures changes in lung electrical impedance over a period of five minutes. The data are then analyzed by Matlab software.
The EIT method is radiation-free and allows for continuous monitoring of respiratory function without the need for an endotracheal tube. EIT has been used to study lung function in children and newborns with critical illnesses. It is useful for monitoring respiratory function, identifying respiratory failure, and assessing the effect of respiratory disease.
Lung function imaging in patients with pleural effusion
The use of electrical impedance tomography lung function imaging has a multitude of uses. It can assess the ventilation and perfusion of the lung and guide medical intervention. One such use is monitoring patients with left ventricular failure. This study was published in the British Journal of Anaesthesia and Eur J Heart Fail.
Functional EIT images display regional variations in impedance during pressure steps. Large changes indicate a large amount of air is trapped in a single lung region. Small variations mean that air is redistributed. When ventilation is resumed, the right lungs were deflated.
Lung function imaging in patients with pulmonary embolism
Electrical Impedance Tomography (EIT) is a technique that measures the changes in impedance of individual lung regions. It uses a mobile or integrated device. An electrode belt holds up to 16 electrodes which sequentially apply an AC current. Depending on the matter in between the electrodes, the impedance changes. For example, air has a higher impedance than blood. The sequential signals are then built up to form a 2D, 32 x 32-pixel image.
Although EIT does not offer the spatial resolution of CT scanning, it offers good temporal resolution. This can help clinicians determine regional ventilation distribution in real time. However, the images produced by EIT can be affected by patient movement, changes in electrode contact, and interference from medical devices. As a result, EIT images must be translated carefully. The EIT imaging technique has gained clinical interest as it can be used as a bedside monitoring tool to determine the effect of respiratory therapies. It can also be used to monitor the effects of chest drains and ventilator settings.
Lung function imaging in patients with severe respiratory disease
In patients with severe respiratory disease, EIT can be a useful tool for evaluating lung function. The EIT image translates changes in lung tissue impedance into lung volume. Although EIT is useful in lung function imaging, it has a number of shortcomings.
EIT is a noninvasive imaging technique based on repeated measurement of surface voltages. It rotates an alternating current of low intensity (5-10 mA) and high frequency (50-80 kHz). The electrodes are placed to be sensitive to the phenomenon being studied.
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