The present invention provides a system and a method for measuring physiological signal. The system includes a plurality of electrodes and a measurement apparatus. A plurality of first electrodes of the electrodes are attached on a first area of a subject. A plurality of second electrodes of the electrodes are attached on a second area of the subject. The measurement apparatus is coupled to the electrodes and performs testing on the first electrodes and the second electrodes to obtain a plurality of testing results. The measurement apparatus selects one of the first electrodes as a first measuring electrode and selects one of the second electrodes as a second measuring electrode according to the testing results. The measurement apparatus measures a physiological signal of the subject through the first measuring electrode and the second measuring electrode.

A respiratory effort belt to be worn by a person undergoing a sleep study comprises a PVDF piezo film transducer having opposite major surfaces metalized and electrical leads electronically connected to the metalized surfaces adhesively bonded to an inelastic cover layer that is, in turn, adhesively joined to an stretchable elastic band that functions as a belt to be secured to the person's chest or abdomen. The transducer produces a time-varying output voltage waveform due to rubbing contact between the elastic band and the PVDF film and not due to tensile forces acting on the film as the person's chest or abdomen rises and falls with inspiration and expiration.

Systems and methods to determine a composite respiration phase of a patient are disclosed, including a signal receiver circuit to receive first and second physiologic information of a patient, and an assessment circuit to determine first respiration phase information of the first physiologic information and to determine the composite respiration phase of the patient using the determined first respiration phase information and the second physiologic information.

A system for visualizing movement of structures within a patient's chest is described herein. The system includes an electromagnetic tracking system, a computing device and a display. The computing device includes a processor configured generate a 3D model of an interior of the patient, obtain positions of EM sensors for the 3D model, determine positions of the EM sensors at intervals during the respiratory cycle, determine positions of the EM sensors at maximum tidal volume and minimum tidal volume, determine differences between the positions of the EM sensors at maximum tidal volume and for the 3D model, generate a 3D model at maximum tidal volume based on the differences between the positions of the EM sensors at maximum tidal volume and for the 3D model, and store in memory the 3D model at maximum tidal volume.

A system for visualizing movement of structures within a patient's chest is described herein. The system includes an electromagnetic tracking system, a computing device and a display. The computing device includes a processor configured generate a 3D model of an interior of the patient, obtain positions of EM sensors for the 3D model, determine positions of the EM sensors at intervals during the respiratory cycle, determine positions of the EM sensors at maximum tidal volume and minimum tidal volume, determine differences between the positions of the EM sensors at maximum tidal volume and for the 3D model, generate a 3D model at maximum tidal volume based on the differences between the positions of the EM sensors at maximum tidal volume and for the 3D model, and store in memory the 3D model at maximum tidal volume.

A wearable respiration monitoring system having a transmitter coil that is adapted to generate and transmit multi-frequency AC magnetic fields and a plurality of receiving coils adapted to detect variable strengths in the AC magnetic fields and generate AC magnetic field strength signals representing anatomical displacements of a monitored subject. The wearable monitoring system further having an electronics module that is adapted to receive the AC magnetic field strength signals and determine at least one respiratory disorder associated with the monitored subject as a function of the AC magnetic field strength signals.

A method of monitoring respiration with an acoustic measurement device, the acoustic measurement device having a sound transducer, the sound transducer configured to measure sound associated with airflow through a mammalian trachea, the method includes correlating the measured sound into a measurement of tidal volume and generating at least one from the group consisting of an alert and an alarm if the measured tidal volume falls outside of a predetermined range.

A method of monitoring respiration with an acoustic measurement device, the acoustic measurement device having a sound transducer, the sound transducer configured to measure sound associated with airflow through a mammalian trachea, the method includes correlating the measured sound into a measurement of tidal volume and generating at least one from the group consisting of an alert and an alarm if the measured tidal volume falls outside of a predetermined range.

Described here are systems and methods for evaluating the extent of brain-skull tethering, which may also be referred to as loss of trabecular reserve, in subjects using magnetic resonance elastography (“MRE”). The present disclosure describes a method for assessing progressive damage to arachnoid space (“SAS”) trabeculae. The method generally includes measuring the relative movement between the brain and the skull using MRE. As one example, an MRE-based method named slip interface imaging (“SII”) can be implemented. By measuring trabecular reserve in subjects who have a history of prior head trauma, the susceptibility of a given subject to future injury can be assessed.

There is provided system for monitoring spontaneous breathing of a mechanically ventilated target individual, including: a feeding tube for insertion into a distal end of an esophagus of the individual, sensor(s) disposed on the feeding tube at a location such that the sensor(s) is located at the distal end of the esophagus of the individual when the feeding tube is in use, wherein the sensor(s) is positioned for sensing values by contact with the tissue of the esophagus including a lower esophageal sphincter (LES) and/or tissue in proximity to the LES, and code for computing an indication of a frequency band of diaphragm movement of the individual according to an analysis of values sensed by the sensor(s), and for adjustment of parameter(s) of a mechanical ventilator for mechanically ventilating the individual, wherein the instructions for adjustment are computed while the feeding tube is in use.