Abstract: The technology described in this document is embodied in a method that includes processing data in a dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The method also includes determining whether one or more segments of the dataset were captured from a subject other than an expected subject by analyzing morphological features of the segments.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The method also includes providing information related to the data to a remote device.

Abstract: The technology described in this document can be embodied in a method that includes obtaining, using a first sensor disposed in a device, a first data set representing time-varying information on at least one pulse pressure wave within vasculature at the wrist of a subject. The method also includes obtaining, using a second sensor disposed in the device, a second data set representing time-varying information about chest vibrations of the subject, and identifying first and second points in the first and second data sets, respectively. The first point represents an arrival time of the pulse pressure wave at the wrist. The second point represents a chest vibration corresponding to an earlier time at which the pulse pressure wave originates at the heart of the subject. Pulse transit time (PTT) is then computed as a difference between the first and second points.

Abstract: The technology described in this document is embodied in a method that includes obtaining a first data set representing time-varying information on at least one pulse pressure wave at a first body part of a subject. The method also includes obtaining a second data set representing time-varying information about motion of the subject at the first body part of a subject. The method also includes identifying a first point in the first data set, the first point representing an arrival time of the pulse pressure wave at the first body part, and identifying a second point in the second dataset, the second point representing an earlier time at which the pulse pressure wave traverses a second body part of the subject. The method also includes computing a pulse transit time (PTT) as a difference between the first and second points.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The method also includes providing, based on the data, information about a medication regimen of the subject.

Abstract: The technology described in this document is embodied in a method that includes deriving a metric associated with a state of a subject, the state of the subject being one or more members selected from the group consisting of health, sleep, fitness, and stress. Deriving the metric is based on data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in the subject acquired at a location of the subject.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The data is acquired while the subject is in a situation associated with risk indicated by the data.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The method also includes providing information related to the data to a remote device.

Abstract: The technology described in this document is embodied in a method that includes processing data in a dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The method also includes determining whether one or more segments of the dataset were captured from a subject other than an expected subject by analyzing morphological features of the segments.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject while the subject is sleeping, processing data in a second dataset that represents time-varying information about motion of the subject acquired at the location of the subject while the subject is sleeping, and determining, based on the data, information about a characteristic of the subject's sleep.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The method also includes processing data in a second dataset that represents time-varying information about motion of the subject acquired at the location of the subject. The method also includes detecting arrhythmia of the subject based on the data.

Abstract: The technology described in this document is embodied in a method that includes processing data in a first dataset that represents time-varying information about at least one pulse pressure wave propagating through blood in a subject acquired at a location of the subject. The data in the first and second datasets is acquired while the subject is in a situation that requires at least a predetermined amount of alertness of the subject.

Abstract: In one embodiment, the present invention provides a CT scanner system for use in baggage screening at security checkpoints.

Abstract: A system and method for baggage screening at security checkpoints. A CT scanner system processes x-ray data to locate and eliminate non-contraband without a full CT reconstruction of the entire bag. The CT scanner system utilizes lineogram data to disqualify objects of insufficient size, density, or mass as potential threats. Objects can be inspected with CT reconstruction. The CT scanner is capable of obtaining CT data and projection images. Multiple CT scanning systems can be multiplexed together, and each CT scanning system is in communication with a review station. Baggage scanning may also be based on security intelligence inputs such as CAPPS to increase throughput.

Abstract: A computed tomography scanner includes a housing, a conveyor disposed at least partially within the housing and configured to move an object to be scanned through the housing along a direction of travel, a gantry connected to the housing and configured to receive the object to be scanned, an x-ray source attached to the gantry and configured to provide an x-ray beam that extends along a length in the direction of travel, and detector arrays attached to the gantry and configured and disposed to receive and detect x-rays from the x-ray source, the detector arrays being displaced relative to each other in the direction of travel an array spacing distance such that a geometric efficiency of the arrays is less than about 80%.

Abstract: A reduced size CT scanner for baggage inspection has a wide angle x-ray source and multiple sets of detectors at different distances from the x-ray source. The detectors in each set are sized and positioned to maintain consistent pitch and flux levels among all detectors. Conventional reconstruction processes can be used to process the data from the CT scanner. The scanner may also be incorporated into a check-in desk in a network of scanners.

Abstract: A reduced size CT scanner for baggage inspection has a wide angle x-ray source and multiple sets of detectors at different distances from the x-ray source. The detectors in each set are sized and positioned to maintain consistent pitch and flux levels among all detectors. Conventional reconstruction processes can be used to process the data from the CT scanner. The scanner may also be incorporated into a check-in desk in a network of scanners.