Abstract: Various systems, devices, and methods for social interaction measurement that preserve privacy are presented. An audio signal can be captured using a microphone. The audio signal can be processed using an audio-based machine learning model that is trained to detect the presence of speech. The audio signal can be discarded such that content of the audio signal is not stored after the audio signal is processed using the machine learning model. An indication of whether speech is present within the audio signal can be output based at least in part on processing the audio signal using the audio-based machine learning model.

Abstract: Methods to quantify motion of a human or animal subject during a magnetic resonance imaging (MRI) exam are provided. In particular, these algorithms make it possible to track head motion over an extended range by processing data obtained from multiple cameras. These methods make current motion tracking methods more applicable to a wider patient population.

Abstract: Systems, devices, and methods for tracking one or more physiological metrics (e.g., heart rate, blood oxygen saturation, and the like) of a user are described. For example, one or more light sources and one or more light detectors may be positioned on a wearable device such that light can be emitted towards the user's skin and further such that light reflected back to the wearable device can be measured and used to generate values for the one or more physiological metrics.

Abstract: Hearing protection combined with head motion tracking for magnetic resonance (MR) procedures is provided. Trackable earplugs include an MR-visible sample combined with a passive resonant circuit. The trackable earplugs act as wireless markers for the MR system. A third wireless MR marker can be disposed on the forehead of the subject to facilitate motion tracking in six degrees of freedom (i.e., 3 rotations, 3 translations). Preferably, the coordinate system for motion tracking is rotated relative to standard MR coordinates to ensure distinct tracking peaks from the two trackable earplugs.

Abstract: Devices and methods to measure and visualize the cardiac and respiratory signal of a human or animal subject during a magnetic resonance imaging (MRI) exam are described. This includes a video camera compatible with the MRI scanner, a means of transferring the video data away from the MRI scanner, a light source that illuminates the subject, and an algorithm that analyses the video stream and uses small image intensity changes and motion information to extract cardiac signal and respiratory signals of the subject. These methods make it practical to use optical tracking to monitor and correct for cardiac and respiratory motion during MRI, as well as provide basic patient monitoring with no physical contact to the subject.

Abstract: Improved cross-calibration between magnetic resonance imaging (MRI) coordinates and optical tracking coordinates is provided. Initial calibration is performed with a calibration tool that includes wireless active markers that can be tracked using the MRI scanner, and an optical marker that can be tracked using the optical tracking system. Data from one or more poses of this tool are used to provide an initial cross-calibration. In use, this initial calibration is corrected to account for differences between actual camera position and the reference location. Here the reference location is the camera location at which the initial calibration was performed.

Abstract: A wearable device includes at least one attachment member and an electrodermal activity (EDA) sensor comprising an integrated electrode pair physically coupled to the at least one attachment member. The electrodermal activity sensor is configured to provide an EDA signal in response to contact between the integrated electrode pair and a skin surface of a user. The integrated electrode pair includes at least two concentric electrodes radially separated by at least one insulator. Each of the at least two concentric electrodes includes an upper surface configured to contact the skin surface of the user in order to generate the EDA signal.

Abstract: Wireless markers having predetermined relative positions with respect to each other are employed for motion tracking and/or correction in magnetic resonance (MR) imaging. The markers are inductively coupled to the MR receive coil(s). The correspondence between marker signals and markers can be determined by using knowledge of the marker relative positions in various ways. The marker relative positions can be known a priori, or can be obtained from a preliminary scan. This approach is applicable for imaging (both prospective and retrospective motion correction), spectroscopy, and/or intervention.

Abstract: Methods to quantify motion of a human or animal subject during a magnetic resonance imaging (MRI) exam are described. In particular, this algorithms that make it possible to track head motion over an extended range by processing data obtained from multiple cameras. These methods make current motion tracking methods more applicable to a wider patient population.

Abstract: A miniature, low-power, optical sensing device that operates in the harsh electromagnetic environment of a magnetic resonance imaging system is provided. The device includes a means of transferring imaging data obtained with the optical sensor out of this harsh electromagnetic environment without requiring a galvanic connection. It is practical to power the device using a small battery that is compatible with the harsh environment. In other embodiments, the device is powered using ‘power over fiber’ or by taking power by ‘power harvesting’ directly from the harsh electromagnetic environment. One embodiment is to directly integrate the device into a magnetic resonance imaging (MRI) head coil, using a wired connection to the head coil to provide electrical power. Here the wired connection does not penetrate the Faraday cage of the MRI system or cross into the bore of the MRI system from outside the bore.

Abstract: A device and a method for calibrating the coordinate system of imaging systems having a tracking system prior or during image data acquisition, e.g. by way of magnetic resonance tomography.

Abstract: Devices and methods to measure and visualize the cardiac and respiratory signal of a human or animal subject during a magnetic resonance imaging (MRI) exam are described. This includes a video camera compatible with the MRI scanner, a means of transferring the video data away from the MRI scanner, a light source that illuminates the subject, and an algorithm that analyses the video stream and uses small image intensity changes and motion information to extract cardiac signal and respiratory signals of the subject. These methods make it practical to use optical tracking to monitor and correct for cardiac and respiratory motion during MRI, as well as provide basic patient monitoring with no physical contact to the subject.

Abstract: Hearing protection combined with head motion tracking for magnetic resonance (MR) procedures is provided. Trackable earplugs include an MR-visible sample combined with a passive resonant circuit. The trackable earplugs act as wireless markers for the MR system. A third wireless MR marker can be disposed on the forehead of the subject to facilitate motion tracking in six degrees of freedom (i.e., 3 rotations, 3 translations). Preferably, the coordinate system for motion tracking is rotated relative to standard MR coordinates to ensure distinct tracking peaks from the two trackable earplugs.

Abstract: Improved cross-calibration between magnetic resonance imaging (MRI) coordinates and optical tracking coordinates is provided. Initial calibration is performed with a calibration tool that includes wireless active markers that can be tracked using the MRI scanner, and an optical marker that can be tracked using the optical tracking system. Data from one or more poses of this tool are used to provide an initial cross-calibration. In use, this initial calibration is corrected to account for differences between actual camera position and the reference location. Here the reference location is the camera location at which the initial calibration was performed.

Abstract: A miniature, low-power, optical sensing device that operates in the harsh electromagnetic environment of a magnetic resonance imaging system is provided. The device includes a means of transferring imaging data obtained with the optical sensor out of this harsh electromagnetic environment without requiring a galvanic connection. It is practical to power the device using a small battery that is compatible with the harsh environment. In other embodiments, the device is powered using ‘power over fiber’ or by taking power by ‘power harvesting’ directly from the harsh electromagnetic environment. One embodiment is to directly integrate the device into a magnetic resonance imaging (MRI) head coil, using a wired connection to the head coil to provide electrical power. Here the wired connection does not penetrate the Faraday cage of the MRI system or cross into the bore of the MRI system from outside the bore.

Abstract: A device and a method for calibrating the coordinate system of imaging systems having a tracking system prior or during image data acquisition, e.g. by way of magnetic resonance tomography.

Abstract: A method of MR imaging and spectroscopy to reduce artifacts occurring due to the motion of an object to be represented, wherein the object position is determined quasi-continuously during the runtime of the MR acquisition, which includes one or more partial acquisitions (TA), and wherein motion correction is performed, which comprises dynamic adaptation of the frequency and phase settings of the RF system of the tomograph and of the orientation and amplitudes of the gradients during the runtime of the MR acquisition according to the current object position. The motion correction is thereby applied during a signal weighting period, during a signal read-out period, or between and/or during the two stated periods and the adaptations for motion correction are performed without interrupting or slowing the temporal progression of the MR acquisition. In this way, artifacts due to motion of the object to be represented can be further reduced.

Abstract: Wireless markers having predetermined relative positions with respect to each other are employed for motion tracking and/or correction in magnetic resonance (MR) imaging. The markers are inductively coupled to the MR receive coil(s). The correspondence between marker signals and markers can be determined by using knowledge of the marker relative positions in various ways. The marker relative positions can be known a priori, or can be obtained from a preliminary scan. This approach is applicable for imaging (both prospective and retrospective motion correction), spectroscopy, and/or intervention.

Abstract: A method of magnetic resonance imaging (MRI) is characterized by the following steps: a) forming a susceptibility model (305, 403) of at least a part of a subject (S), including an imaged body part (203), by using a structural magnetic resonance image (301) of the part of the subject (S) and/or prior knowledge of the anatomy of the subject (S); b) computing susceptibility-induced field deviations (404) present in the imaging volume at each time MR signals are acquired using the susceptibility model (305, 403) and the knowledge of a monitored position and monitored orientation (401) of the part of the subject (S) at that time; c) using the information about the susceptibility-induced field deviations (404) derived in b) for image correction (406), in particular correction of image distortions and/or intensity modulations. The quality of magnetic resonance imaging of moving subjects is thereby improved.

Abstract: A method of MR imaging and spectroscopy reduces artifacts occurring due to the motion of an object to be represented, wherein the object position is determined quasi-continuously during the runtime of the MR acquisition, which includes one or more partial acquisitions (TA), and wherein motion correction is performed, which comprises dynamic adaptation of the frequency and phase settings of the RF system of the tomograph and of the orientation and amplitudes of the gradients during the runtime of the MR acquisition according to the current object position. The motion correction is thereby applied during a signal weighting period, during a signal read-out period, or between and/or during the two stated periods and the adaptations for motion correction are performed without interrupting or slowing the temporal progression of the MR acquisition. In this way, artifacts due to motion of the object to be represented can be further reduced.