In contrast to most other<unk> c imaging techniques,<unk>  does not apply any kind of ionizing radiation. Currents typically applied in<unk>  are relatively small and certainly below the threshold at which they would cause significant nerve stimulation. The frequency of the alternating current is sufficiently high not to give rise to electrolytic effects in the body and the Ohmic power dissipated is sufficiently small and diffused over the body to be easily handled by the body's thermoregulatory system. These properties qualify<unk>  to be continuously applied in humans, e.g. during mechanical ventilation in an intensive care unit (ICU). Because the equipment needed in order to perform<unk>  is much smaller and less costly than in conventional<unk> ,<unk>  qualifies for continuous real time visualization of lung ventilation right at the bedside.<unk> ’s major disadvantage versus conventional<unk>  is its lower maximum spatial resolution (approximately 15% of electrode array diameter in<unk>  compared to 1 mm in CT and MRI). However, resolution can be improved using 32 instead of 16 electrodes. Image quality can be further improved by constructing an<unk>  system with active surface electrodes, which significantly reduce signal loss, artifacts, and interferences associated with cables as well as cable length and handling. In contrast to spatial resolution, temporal resolution of<unk>  (0.1 milliseconds) is much higher than in CT or MRI (0.1 seconds).
Electrical impedance tomography
Impedance–pH monitoring
Impedance threshold device
Gastric tonometry
Sweat test
Esophageal pH monitoring
Salicylate testing
Electrical impedance myography