An apparatus for imposing electric fields through a target region in a body of a patient, the apparatus comprising: at least one transducer array having a plurality of electrode elements configured for placement on the body of the patient, the plurality of electrode elements being configured to provide tumor treating fields (TTFields) via an alternating current waveform; and a sensor array (90; 90a; 90b; 90c; 90d) having at least one first temperature sensor (16; 16a; 16a, b) and at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f); characterized by: the at least one first temperature sensor (16; 16a; 16a, b) being connected to first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) being connected to the first conductor (30; 30a) and a third conductor (30; 30e; 30f; 30g; 30d); and a controller configured to: provide a first known amount of electricity for activation of the at least one first temperature sensor (16; 16a; 16a, b) via the first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and a second known amount of electricity for activation of the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) via the first and third conductors (30; 30a, e; 30a, f; 30a, g; 30a, d); obtain a first electrical reading induced by the first known amount of electricity and a second electrical reading induced by the second known amount of electricity; determine a first temperature reading based on the first electrical reading and a second temperature reading based on the second electrical reading; and adjust the alternating current waveform based on the first and second temperature readings. at least one transducer array having a plurality of electrode elements configured for placement on the body of the patient, the plurality of electrode elements being configured to provide tumor treating fields (TTFields) via an alternating current waveform; and a sensor array (90; 90a; 90b; 90c; 90d) having at least one first temperature sensor (16; 16a; 16a, b) and at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f); characterized by: the at least one first temperature sensor (16; 16a; 16a, b) being connected to first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) being connected to the first conductor (30; 30a) and a third conductor (30; 30e; 30f; 30g; 30d); and a controller configured to: provide a first known amount of electricity for activation of the at least one first temperature sensor (16; 16a; 16a, b) via the first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and a second known amount of electricity for activation of the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) via the first and third conductors (30; 30a, e; 30a, f; 30a, g; 30a, d); obtain a first electrical reading induced by the first known amount of electricity and a second electrical reading induced by the second known amount of electricity; determine a first temperature reading based on the first electrical reading and a second temperature reading based on the second electrical reading; and adjust the alternating current waveform based on the first and second temperature readings. the at least one first temperature sensor (16; 16a; 16a, b) being connected to first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) being connected to the first conductor (30; 30a) and a third conductor (30; 30e; 30f; 30g; 30d); and a controller configured to: provide a first known amount of electricity for activation of the at least one first temperature sensor (16; 16a; 16a, b) via the first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and a second known amount of electricity for activation of the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) via the first and third conductors (30; 30a, e; 30a, f; 30a, g; 30a, d); obtain a first electrical reading induced by the first known amount of electricity and a second electrical reading induced by the second known amount of electricity; determine a first temperature reading based on the first electrical reading and a second temperature reading based on the second electrical reading; and adjust the alternating current waveform based on the first and second temperature readings. provide a first known amount of electricity for activation of the at least one first temperature sensor (16; 16a; 16a, b) via the first and second conductors (30; 30a, d; 30a, e; 30a, f; 30a, c) and a second known amount of electricity for activation of the at least one second temperature sensor (16; 16d; 16e; 16f; 16e, f) via the first and third conductors (30; 30a, e; 30a, f; 30a, g; 30a, d); obtain a first electrical reading induced by the first known amount of electricity and a second electrical reading induced by the second known amount of electricity; determine a first temperature reading based on the first electrical reading and a second temperature reading based on the second electrical reading; and adjust the alternating current waveform based on the first and second temperature readings.