Figure 10.

Dos and don'ts about the technique of electric field delivery using needle electrodes. At left, a common mistake during the treatment of rounded lesions is the application perpendicularly to the surface. In this way, the tumoral bed may not be correctly treated, and the center of the mass may be overtreated. In the middle, the delivery of the pulses perpendicularly to the surface where the tumor lies. This provides adequate treatment of the bed of the lesion. At right, is a scheme of the distance between the applications of a 6-needle electrode. As it can be seen, if they are too separated (up), untreated areas may lead to a relapse. If they are too superposed (middle), overtreatment may produce necrosis and unintended tissue damage. The right distance is a slight superposition of the applications (down).