A machine holds a plurality of RF beam generators which all point at a particular location. A patient with a target volume of tissue to be treated by heat is held immobile such that the target is located at the point all the RF beams traverse. The RF beams traverse that point and the resultant generated heat treats the target. No two or more RF beams traverse any other location in the patient's body. Since each individual RF beam is too weak to cause damage, the non-targeted tissues of the patient are unharmed.
