This non invasive treatment is usually for brain tumours or where cancer has spread to the brain, but is being trialled for other cancers. The electrodes used in the treatment (rather than in lab test) are capacitively coupled electrodes which block DC from the skin and allowing AC to pass into the patient's body. The patient can move about while they are being treated and hence the need for a type of electrode that isn't adversely affected by movement. In some treatments, these electrodes can be placed over clothes.

It's not the same as diathermy or ablation where electrodes are used to apply or induce heat in the tissue but rather, it is a method of interfering with the division of the cells.