215results about How to "Reduce Motion Artifacts" patented technology

Methods and devices are provided for reducing motion artifacts when monitoring volume changes in blood vessels. Light having a first wavelength and light having a second wavelength are transmitted through a human appendage, toward the epidermis of a patient, or through tissue within the body of a patient. A portion of the light having the first wavelength and a portion of the light having the second wavelength is received. A first signal is produced based on the received portion of light having the first wavelength. A second signal is produced based on the received portion of light having the second wavelength. One of the first and second signals is subtracted from the other to produce a plethysmography signal that is representative of volume changes in blood vessels of patient tissue.

A method of measuring Photoplethysmography (PPG) signals may comprise detecting dual wavelength illumination from a light detector so as to provide detected signals, converting the detected signals into digital signals so as to provide digital signals, reducing noises from the digital signals and increasing independency between the digital signals so as to provide preprocessed signals, subtracting the average value from the preprocessed signals so as to provide adjusted signals, obtaining whitening matrix based on covariance, eigen value, and eigen matrix obtained from the adjusted signals, and restoring data using the whitening matrix.

An optical coherence tomography (OCT) system including a polarizing splitter disposed to direct light in an interferometer such that the OCT detector operates in a noise-optimized regime. When scanning an eye, the system detector simultaneously produces a low-frequency component representing a scanning laser ophthalmoscope-like (SLO-like) image pixel and a high frequency component representing a two-dimensional (2D) OCT en face image pixel of each point. The SLO-like image is unchanging with depth, so that the pixels in each SLO-like image may be quickly realigned with the previous SLO-like image by consulting prominent image features (e.g., vessels) should lateral eye motion shift an OCT en face image during recording. Because of the pixel-to-pixel correspondence between the simultaneous OCT and SLO-like images, the OCT image pixels may be remapped on the fly according to the corresponding SLO-like image pixel remapping to create an undistorted 3D image data set for the scanned region.

A pulmocardiac assistance apparatus is disclosed for use in the medical technology field to provide expiratory and inspiratory functionality to patients with respiratory disorders. The pulmocardiac assistance device of the present invention functions to collect body response feedback and manages this feedback to achieve an optimum response. The device includes an integrated set of pressure cuffs for pressuring different parts of the body in accordance with a predetermined sequence to induce the patient to breathe out or expire air from the lungs or to even produce an assisted cough, as well as to promote circulation of blood from the extremities of the body to the head. The pulmocardiac assistance device further includes a programmable logic controller which accepts inputs from sensors (e.g. patient temperature, blood gas concentrations, arterial pH level) and makes calculations to control both ventilator and pressure cuffs.

The present invention is directed to a holder for use in positioning a pulse oximeter sensor in multiple selectable locations relative to a patient's extremities. The holder includes at least one flexible elongate member that is conformable to and, preferably, about a patient's extremity. A connector on the elongate member is utilized to secure the elongate member to the patient's extremity. Additionally, the elongate member's inside surface contains one or more recesses for selectively receiving a sensor and holding that sensor relative to one or more positions on the inside surface of the flexible sensor holder. The inclusion of multiple recesses allows medical personnel flexibility in positioning a medical sensor. In one embodiment, the holder includes two elongate members for conforming about two portions of a patient's extremity to reduce movement between the extremity and a sensor held by the sensor holder.

A method of measuring Photoplethysmography (PPG) signals may comprise detecting dual wavelength illumination from a light detector so as to provide detected signals, converting the detected signals into digital signals so as to provide digital signals, reducing noises from the digital signals and increasing independency between the digital signals so as to provide preprocessed signals, subtracting the average value from the preprocessed signals so as to provide adjusted signals, obtaining whitening matrix based on covariance, eigen value, and eigen matrix obtained from the adjusted signals, and restoring data using the whitening matrix.

A method for registration of cardiac image data in an interventional system includes inserting a first plurality of fiducial points on an acquired 3D anatomical image and exporting the 3D anatomical image, with the first plurality of inserted fiducial points thereon, to an interventional system. A second plurality of fiducial points is inserted on the exported 3D anatomical image using the interventional system, and the first and said second plurality of fiducial points are aligned to one another so as to register the exported 3D anatomical image with the interventional system.

Methods and devices are provided for reducing motion artifacts when measuring blood oxygen saturation. A portion of the light having the first wavelength, a portion of light having the second wavelength and a portion of the light having the third wavelength are received. A first signal is produced based on the received portion of light having the first wavelength. Similarly, a second signal is produced based on the received portion of light having the second wavelength, and a third signal is produced based on the received portion of light having the third wavelength. A difference between the second signal and the first signal is determined, wherein the difference signal is first plethysmography signal. Similarly, a difference is determined between the third signal and the first signal to produce a second plethysmography signal. Blood oxygen saturation is then estimated using the first and second plethysmography signals.

A method of correcting for motion in magnetic resonance images of an object detected by a plurality of signal receiver coils comprising the steps of acquiring a plurality of image signals with the plurality of receiver coils, determining motion between sequential image signals relative to a reference, applying rotation and translation to image signals to align image signals with the reference, determining altered coil sensitivities due to object movement during image signal acquisition, and employing parallel imaging reconstruction of the rotated and translated image signals using the altered coil sensitivities in order to compensate for undersampling in k-space.

An electrode holder is adapted for cooperating with a strap applied to a body part of a patient to hold a surface electrode to the skin. The electrode holder includes a base and a post projecting from the base. The post is adapted for extending through the strap and into a cavity formed with the electrode. The electrode holder is releasably attached to the strap by mating hook and loop fasteners. Once attached, the post of the holder secures the electrode in position thereby reducing motion artifacts caused by disturbance of the electrode after placement against the skin of the patient.

The present invention is wearable physical sign detector, physical sign telemetering and warning system and method. The system includes a physical sign detector, an analysis and judgment base station and an emergency treatment device. The physical sign detector sends detected physical sign information to the analysis and judgment base station in radio or wired mode. In case of emergency, the analysis and judgment base station sends first-aid signal and the detected physical sign information to the emergency treatment device automatically in radio or wired mode. The present invention senses PPG signal from the ear of the wearer of the physical sign detector, and has raised comfort deg and decreased sports pseudo image interference. The present invention may join to automatic emergency alarm service system for sending emergency calling to the emergency aid center and transmitting physical sign information.

There is provided a CMOS imager system for providing a viewable image having increased dynamic range including an image sensor including a number of sets of pixels. Each set of pixels is configured to receive one of a number of exposures and to generate image data corresponding to the received exposure in the interleaved mode. The image sensor is configured to operate in either an interleaved mode or a non-interleaved mode and to output the image data generated by each set of pixels as a frame of interleaved image data in the interleaved mode. The imager system further includes an interleaved image pipeline in communication with the image sensor, where the interleaved image pipeline is configured to receive the interleaved image data from the image sensor, combine the image data generated by each set of pixels corresponding to one of the exposures to form the viewable image.

An electrode holder is adapted for cooperating with a strap applied to a body part of a patient to hold a surface electrode to the skin. The electrode holder includes a base and a post projecting from the base. The post is adapted for extending through the strap and into a cavity formed with the electrode. The electrode holder is releasably attached to the strap by mating hook and loop fasteners. Once attached, the post of the holder secures the electrode in position thereby reducing motion artifacts caused by disturbance of the electrode after placement against the skin of the patient.

Systems and methods which implement an image reconstruction framework to incorporate complex motion of structure, such as complex deformation of an object or objects being imaged, in image reconstruction techniques are shown. For example, techniques are provided for tracking organ motion which uses raw time-stamped data provided by any of a number of imaging modalities and simultaneously reconstructs images and estimates deformations in anatomy. Operation according to embodiments reduces artifacts, increase the signal-to-noise ratio (SNR), and facilitates reduced image modality energy dosing to patients. The technology also facilitates the incorporation of physical properties of organ motion, such as the conservation of local tissue volume. This approach is accurate and robust against noise and irregular breathing for tracking organ motion.

A measurement device is presented for use in an EEG measurement performed in the presence of a magnetic field. The device comprises a wiring array for connecting an electrodes arrangement to an electroencephalogram (EEG) monitoring device. The wiring array comprises a plurality of sampling lines arranged to form a first group of sampling lines arranged in a spaced-apart substantially parallel relationship extending along a first axis, at least some of said sampling lines being wire bundles of said first group comprising a plurality of first wires for connecting to a corresponding first plurality of electrodes of said EEG electrodes arrangement; and a second group of sampling lines arranged in a spaced-apart substantially parallel relationship extending along a second axis, intersecting with said first axis, such that said second group of bundles crosses said first group of bundles to form a net structure, at least some of said sampling lines being wire bundles of said second group comprising a plurality of second wires for connecting to a corresponding second plurality of electrodes of said EEG electrodes' arrangement. The wiring array is configured and operable for transmitting a signal measured by the respective electrodes to the EEG monitoring device, enabling generation of EEG data indicative of the neural signal profile along tow directions and characterized by reduced motion artifact and / or reduced gradient artifact associated with the presence of the magnetic field during the EEG measurement.

An optical coherence tomographic apparatus wherein a reference light path includes at least a first reference light path and a second reference light path having an optical path length shorter than that of the first reference light path, wherein first tomographic information of the object at a first inspection position based on the optical interference using the first reference light path and second tomographic information of the object at a second inspection position based on the optical interference using the second reference light path, are acquired, the second inspection position being shallower than the first inspection position with respect to a depth direction of the object, and wherein a positional deviation a tomographic image at the first inspection position obtained based on the first tomographic information is corrected using the second tomographic information.

A method for the acquisition of measurement data of a breathing examination subject by magnetic resonance includes the following steps: (a) detect the physiological breathing signal of the examination subject with a breathing signal detection unit, (b) evaluate the detected breathing signal in an evaluation unit, (c) based on the evaluated breathing signal, calculate in a computer at least one parameter affecting the type of acquisition of measurement data by means of magnetic resonance, (d) detect a current physiological breathing signal with the breathing signal detection unit, (e) compare the last detected breathing signals with at least one trigger condition, (f) initiate the acquisition of measurement data using the calculated parameter from step (c) upon satisfaction of the trigger conditions from step (e), (g) repeat the steps (d) through (f) until all desired measurement data have been acquired, and (h) store and / or process the acquired measurement data in a memory and / or processing unit. After the evaluation of the detected breathing signal, at least one parameter of a following acquisition of measurement data is thus determined automatically without an input by an operator of the MR apparatus in use being required.

In embodiments, a T-O-F depth imaging device renders a depth image of an object that has corrected depth values. The device includes a pixel array that uses an Electronic Rolling Shutter scheme. The device also includes a light source that transmits towards the object light that is modulated at an operating frequency, and an optical shutter that opens and closes at the operating frequency. The optical shutter further modulates the light that is reflected from the object, before it reaches the pixel array. The transmission of the light and the operation of the shutter change phase relative to each other while at least one of the pixels is sensing the light it receives, which permits a faster frame rate. Depth is determined by the amount of light sensed by the pixels, and a correction is computed to compensate for the changing phase.

A filter includes a conventional filtering block and a protection block. The conventional filtering block receives input values and provides filtered values. The protection block receives filtered values and a group of input values proximate the current input, to ensure that the output is lies within a range computed for the current input. The range is determined by the protection block based on the group of input values proximate the current input. Any algorithm or statistical function may be applied to the group of input values to determine the range. If a filtered value provided by the conventional filtering block is outside the range, then the protection block computes and outputs a value that is within the range. The filter may be used in temporal or spatial filtering of images and video to mitigate artifacts such as motion artifacts and static artifacts.

Methods and non-transitory computer readable media that store executable instructions to perform a method for reducing motion artifacts in shear wave measurements are presented. Accordingly, reference pulses are delivered to a common motion tracking location (CMTL) and a plurality of target locations in a region of interest (ROI) to detect corresponding initial positions. Further, a shear wave is generated and tracked in the ROI using tracking pulses delivered to the CMTL and the plurality of target locations for determining corresponding displacements. Additionally, an average displacement of the CMTL is computed. Further, a motion corrected displacement for a target location in the plurality of target locations is estimated based on a displacement of the target location at a particular time, a corresponding displacement of the CMTL measured proximate in time to the measurement of the displacement of the target location and the average displacement of the CMTL.

An OLED display device includes first and second group pixels that emit light during first and second fields, respectively; first and second scan lines respectively coupled to the first and second group pixels; and first and second power lines for respectively supplying first and second power voltages to the first and second group pixels. The first and second power lines are coupled with first electrodes of the respective storage capacitors of the first and second group pixels, and the first power voltage is supplied as a first level voltage for a first period during which the first group pixels concurrently emit light. The first and second power lines are coupled with first electrodes of the respective storage capacitors of the first and second group pixels, and the first power voltage is supplied as a first level voltage for a first period during which the first group pixels concurrently emit light.

The invention discloses a high-density active flexible electrode array and a signal conditioning circuit thereof. The signal conditioning circuit comprises the high-density active flexible electrode array and an amplification filter circuit thereof. The electrode array collects skin position surface potentials corresponding to electrodes, and an operational amplifier or an instrumental amplifier arranged on a flexible plate performs impedance transformation or first-stage amplification. The operational amplifier performs impedance transformation on each electrode, and the rear-stage instrumental amplifier performs amplification and filtering on difference values between every two adjacent signals. The instrumental amplifier performs first-stage amplification directly, and performs amplification on difference values between every two adjacent electrode pairs directly. The signal conditioning circuit performs amplification and filtering processing on multichannel surface electromyogram signals output by the electrode array, and outputs multichannel surface electromyogram signals with certain bandwidth and convenient for A / D (analog to digital) conversion. The high-density active flexible electrode array can acquire the skin surface potentials of human bodies, and can acquire the multichannel surface electromyogram signals with high quality and low noise even if in uneven areas.

The invention relates to a method for registering intra-operative image data set with pre-operative 3D image data set, comprising: spatial calibrating an optical 3D sensor system with an intra-operative imaging modality, intra-operative detecting the surface of an examination area of interest with the 3D sensor system to produce an intra-operative surface mask, intra-operative recording the area of interest for examination with the intra-operative modality at least partly containing the intra-operative surface mask to obtain an intra-operative image data set, computing the same surface from the pre-operative 3D image data set containing the detected surface to obtain a pre-operative surface mask, registering the intra-operative and pre-operative surface mask with each other, determining a mapping specification between pre-operative 3D image data set and intra-operative image data set based on the calibration and the registration, and overlaying the intra-operative image data set with the pre-operative 3D data set based on the mapping specification.

A system and method for creating a three dimensional cross sectional image of an object by the reconstruction of its projections that have been iteratively refined through modification in object space and Fourier space is disclosed. The invention provides systems and methods for use with any tomographic imaging system that reconstructs an object from its projections. In one embodiment, the invention presents a method to eliminate interpolations present in conventional tomography. The method has been experimentally shown to provide higher resolution and improved image quality parameters over existing approaches. A primary benefit of the method is radiation dose reduction since the invention can produce an image of a desired quality with a fewer number projections than seen with conventional methods.