A thoracic analysis device for deriving a total volume of fluids in the lung comprising a combination of extravascular, intravascular, and intracellular fluids of a lung of a subject, comprising: a first interface for receiving a plurality of electromagnetic (EM) measurements of a plurality of EM signals, said plurality of EM signals are captured from a thoracic intrabody area of lungs of a subject in a plurality of different time points during a thoracic volume manipulation of said subject; a second interface for receiving a plurality of thoracic volume values, wherein each of said plurality of thoracic volume values is measured at one of said plurality of different time points during said thoracic volume manipulation of said subject; and characterized by : a processor adapted to: deriving at least one individual thoracic parameter by combining between said plurality of EM measurements and said plurality of thoracic volume values; personalizing a dielectric model according to the at least one individual thoracic parameter; calibrating said thoracic analysis device according to said personalized dielectric model; capturing, by said calibrated thoracic analysis device, a plurality of later EM measurements of a plurality of later EM signals from the thoracic intrabody area of lungs of the subject to extract the total volume of fluids in the lung of the subject ( V fluid ), wherein a total lung tissue volume in the lung is composed of the total volume of fluids (V fluld ) and lung air content ( V air ). a first interface for receiving a plurality of electromagnetic (EM) measurements of a plurality of EM signals, said plurality of EM signals are captured from a thoracic intrabody area of lungs of a subject in a plurality of different time points during a thoracic volume manipulation of said subject; a second interface for receiving a plurality of thoracic volume values, wherein each of said plurality of thoracic volume values is measured at one of said plurality of different time points during said thoracic volume manipulation of said subject; and characterized by : a processor adapted to: deriving at least one individual thoracic parameter by combining between said plurality of EM measurements and said plurality of thoracic volume values; personalizing a dielectric model according to the at least one individual thoracic parameter; calibrating said thoracic analysis device according to said personalized dielectric model; capturing, by said calibrated thoracic analysis device, a plurality of later EM measurements of a plurality of later EM signals from the thoracic intrabody area of lungs of the subject to extract the total volume of fluids in the lung of the subject ( V fluid ), wherein a total lung tissue volume in the lung is composed of the total volume of fluids (V fluld ) and lung air content ( V air ). a processor adapted to: deriving at least one individual thoracic parameter by combining between said plurality of EM measurements and said plurality of thoracic volume values; personalizing a dielectric model according to the at least one individual thoracic parameter; calibrating said thoracic analysis device according to said personalized dielectric model; deriving at least one individual thoracic parameter by combining between said plurality of EM measurements and said plurality of thoracic volume values; personalizing a dielectric model according to the at least one individual thoracic parameter; calibrating said thoracic analysis device according to said personalized dielectric model; capturing, by said calibrated thoracic analysis device, a plurality of later EM measurements of a plurality of later EM signals from the thoracic intrabody area of lungs of the subject to extract the total volume of fluids in the lung of the subject ( V fluid ), wherein a total lung tissue volume in the lung is composed of the total volume of fluids (V fluld ) and lung air content ( V air ). <EOS>