The invention relates to an apparatus and method which are designed to be used for diagnosis and therapy based on non-ionising radiations. The operation thereof is based on the principle of nuclear magnetic resonance. A quantitative diagnosis can be made using the following devices: a manually-controlled digital filter/selector (18), a monitor for frequency matrices (25), a monitor for frequency images (26), and a control panel (28). Moreover, therapy can be provided with the following devices: a radio frequency resonating antenna (4), a low radio frequency signal processor/modulator (10), a radio frequency pulse amplifier (13) and, a central pulse control unit (16). According to the invention, the emission parameters (frequency, power and polarity) can be selectively adjusted in order to provide personalised therapy. The invention substantially improves selection and/or differentiation levels throughout the entire process. The invention is scientifically, technically and commercially viable.