159results about How to "Exact reference" patented technology

A position sensing system includes a probe adapted to be introduced into a body cavity of a subject. The probe includes a magnetic field transducer and at least one probe electrodes. A control unit is configured to measure position coordinates of the probe using the magnetic field transducer. The control unit also measures an impedance between the at least one probe electrodes and one or more points on a body surface of the subject. Using the measured position coordinates, the control unit calibrates the measured impedance.

A position sensing system includes a probe adapted to be introduced into a body cavity of a subject. The probe includes a magnetic field transducer and at least one probe electrodes. A control unit is configured to measure position coordinates of the probe using the magnetic field transducer. The control unit also measures an impedance between the at least one probe electrodes and one or more points on a body surface of the subject. Using the measured position coordinates, the control unit calibrates the measured impedance.

The invention relates to a method and system for its implementation for referencing or registering a body part in a camera-assisted, medical navigation system, comprising: manually manipulating a light beamer so as to scan a light beam produced thereby across a surface of the body part to sequentially reflect light off the surface of the body part at a plurality of locations; sequentially detecting the light reflected from the surface of the body part at the plurality of locations; determining three-dimensional spatial positions of the plurality of locations based on the detected light; and referencing or registering the body part to medical image data based on the three-dimensional spatial positions of the plurality of locations and surface data determined from the medical image data.

A vehicle guidance system. The system includes a first mechanism for tracking a vehicle based on time-of-arrival information associated with energy emanating from the vehicle and providing vehicle position information in response thereto. A second mechanism steers the vehicle based on the vehicle position information. In a specific embodiment, the system of further includes a third mechanism for locating the target based on time-of-arrival information associated with energy radiating from the target and providing target location information in response thereto. The second the second mechanism steers the vehicle based on the target location information and the vehicle position information.

A mount for mobile electronic devices such as a satellite dish antenna system. The mount includes a tripod and an elongated post member supported on it by a universal joint or pivot mechanism. The post member extends along a longitudinal axis and the pivot mechanism allows the post member to be moved about two, substantially perpendicular pivotal axes relative to the tripod to align the longitudinal axis of the post member with the vertical. Once the axis of the post member is aligned vertically, the alignment system of the attachable satellite dish will then have a proper reference from which to aim or direct the dish (e.g., azimuth and elevation) for best reception and transmission. The mount includes an arrangement of cables extending between the tripod legs and adjustable straps extending between each tripod leg and the post member to provide a very strong and stable support for the satellite dish antenna system that is attachable to the upper end of the vertically aligned post member. The tripod is designed to be foldable into a compact configuration for easy transport and storage with each tripod leg folded onto itself and positioned under a central member of the tripod. The folding and unfolding of the tripod and the alignment of the post member to the vertical on it can all be done by one person without the need for any tools.

An interface circuit includes: a first synchronizing circuit for synchronizing a signal having a delay equal to or more than a predetermined period with respect to a reference clock, with the reference clock; a second synchronizing circuit for synchronizing a signal having a delay less than the predetermined period with respect to the reference clock, with the reference clock; a delay determining circuit for outputting a determination signal based on a delay of the signal relative to the reference clock; a delay determination setting circuit for outputting a path setting signal that designates an output value of one of the first synchronizing circuit and the second synchronizing circuit based on a preset value; and a delay selecting circuit for selecting and outputting an output value of one of the first synchronizing circuit and the second synchronizing circuit based on one of the determination signal and the path setting signal.

A circuit for measuring current drawn by a self-powered electronic protection device. The circuit monitors current in a polyphase alternating current (AC) power source by measuring current in a rectified secondary winding of a current transformer coupled to a phase current of the power source. The measurement circuit includes a measurement burden connected between the cathode of the current transformer rectifier and a switch. Closing the switch references the voltage drop across the measurement burden to a reference potential. A controller closes the switch while receiving measurements of the voltage drop. Because the voltage drop is referenced to a reference potential, it can be analyzed in a controller to detect a fault condition without being conditioned with an inverting amplifier or a difference amplifier.

The present invention provides systems and methods that employ a continuously variable optical delay line to introduce a delay into a transmitted optical signal. The delay line comprises a holey fiber configured in a spiral layout, wherein one end of the fiber is operative to a reflective fluid reservoir and the other end in operative to an input port. A segmented piezoelectric actuator is employed to position a reflective fluid within the fiber, utilizing a commutated technique that continuously moves the fluid. A signal received at the input port is routed through the holey fiber at an angle of incidence to achieve total internal reflection. The signal traverses towards the reflective fluid, and reflects back towards the input port after coming into contact with the fluid's surface. The delay introduced into the signal is a function of the distance traveled through the delay line.

The invention relates to a method for referencing a patient or a patient body part in a camera-assisted, medical navigation system comprising the following steps: the patient body part to be referenced is brought into the detecting range of a navigation system assisted by at least two cameras (5, 6), this navigation system detecting with computer support the three-dimensional, spatial positions of light marks (3), light marks (3) are generated on the surface of the part of the body to be referenced by means of a light beam (2), the three-dimensional position of the light marks (3) being determined by the camera-assisted navigation system, the three-dimensional position of the surface of the part of the body to be referenced is determined by means of the positional data for the light marks (3). The invention relates furthermore to an apparatus for implementing the method.

The invention provides an ultrasonic angiography image analysis method and system. The method comprises the following steps: obtaining a dynamic medical image meeting a DICOM (Digital Imaging and Communications in Medicine) standard; selecting an initial region of interest from the dynamic medical image; calculating a plurality of corresponding analysis parameter values of each pixel point of the initial region of interest, and carrying out colorful encoding on the analysis parameter values to obtain colorful codes of different parameters of the initial region of interest; selecting a current region of interest of the colorful codes; obtaining a parameter analysis curve of the current region of interest and a contrast speed analysis curve; providing an analysis result of the current region of interest. Compared with the prior art, the method can be used for carrying out the colorful encoding on the plurality of corresponding analysis parameter values of each pixel point, so that contrast parameters can be accurately quantified, and furthermore, accurate reference and differential diagnosis can be provided for doctors. The current region of interest can also be subjected to parameter analysis and speed analysis on the basis of the initial region of interest, and the clinical diagnosis can be facilitated.

The invention discloses a lung cancer image fine classification method based on fusion of LBP and wavelet moment features. The lung cancer image fine classification method is characterized in that S1, nidus positioning of an input image can be carried out; S2, a plurality of templates of the nidus part can be generated randomly; S3, the scaling of the input image in different dimensions can be carried out, and the extraction of the textural feature MB-LBP and shape feature wavelet moment of the image block and the template block can be respectively carried out, and then the two features can be integrated by adjusting the weighting parameters by the experiment; S4, the feature response image can be acquired by matching the different positions of the image; S5, the response image can be converted into the feature vector by adopting the improved mean space pyramid model; S6, the fine classification can be realized by adopting the vector machine. The algorithm provided by the invention is the attempt of the fine classification idea in the medical science field, and the generating of the redundant templates can be reduced. The lung cancer image information can be represented by the well fusion of the LBP textural features and the wavelet moment features. By adopting the pyramid model extraction model, the strong features can be maintained, and the identification precision can be improved.

An alternate construction and method for a magnetostrictive probe intended to be used as a tank monitoring device. Height determination, either water or fuel, is referenced to an ultrasonic pickup assembly located inside the shaft at the foot of the probe. With this inverse approach, height measurement uses the relative geothermal stability of underground storage tanks, or the temperature stability offered by the thermal mass of the fuel, to facilitate a tank level determination. At that new location, the detection circuit is isolated from the effect of magnetic risers, large temperature swings and other undesirable phenomenon that often affect magnetostrictive probe measurements that are referenced to the canister. Aside from its primary use as referred to by this disclosure, this probe could be adapted for any application necessitating precise knowledge of height or distance measurement in relation to the foot of the probe without using a reference magnet.