55 results about "Emission scan" patented technology

A combined PET and X-Ray CT tomograph for acquiring CT and PET images sequentially in a single device, overcoming alignment problems due to internal organ movement, variations in scanner bed profile, and positioning of the patient for the scan. In order to achieve good signal-to-noise (SNR) for imaging any region of the body, an improvement to both the CT-based attenuation correction procedure and the uniformity of the noise structure in the PET emission scan is provided. The PET/CT scanner includes an X-ray CT and two arrays of PET detectors mounted on a single support within the same gantry, and rotate the support to acquire a full projection data set for both imaging modalities. The tomograph acquires functional and anatomical images which are accurately co-registered, without the use of external markers or internal landmarks.

The invention discloses a real-time spatial positioning system. The real-time spatial positioning system comprises a laser emission scanning part and a laser receiving part. The laser emission scanning part comprises a 360-degree transverse scanning laser and a 360-degree longitudinal scanning laser, and zero-graduation activation of the scanning lasers is achieved through zero graduation inductive sensors respectively; laser receiving sensors are arranged on a device needing spatial positioning; besides, an infrared LED lamp array is arranged to achieve signal synchronization of laser emission scanning and laser receiving. The invention further discloses a spatial positioning method and a virtual reality device comprising the spatial positioning system. The two perpendicular 360-degree lasers are arranged for emission scanning, and the receiving sensors are arranged for receiving; besides, signal synchronization of laser emission scanning and laser receiving is achieved through zero graduation infrared exposure; in addition, the three-dimensional position of the laser receiving part in a positioning space is accurately obtained by calculating the quartic signal time difference within one working cycle, and thus the real-time accurate positioning effect is achieved. Use is convenient, positioning is accurate, and the refreshing rate is high.

An organic light emitting display apparatus minimizes brightness reduction and power consumption increase, and can remove motion blurring. The organic light emitting display apparatus includes a plurality of pixels, each including an organic light emitting device and a pixel circuit, a data driving unit to apply a data signal to data lines connected to the pixels, a scan driving unit to apply a selection signal to selection scan lines connected to the pixels, an emission signal generating unit to generate a first emission signal, an emission duty controlling unit to calculate basic information to reduce motion blurring and to generate an emission duty control signal based on the basic information, a logic gate to output a second emission signal by receiving the first emission signal and the emission duty control signal, and an emission driving unit to apply the second emission signal to emission scan lines connected to the pixels.

Imaging system and method are presented. Emission scan (ES) and anatomical scan (AS) data corresponding to a target volume in a subject are received. One or more at least partial AS images are reconstructed using AS data. An image-space certainty (IC) map representing a confidence level (CL) for attenuation coefficients of selected voxels in AS images and a preliminary attenuation (PA) map based on AS images are generated. One or more of selected attenuation factors (AF) in projection-space are initialized based on PA map. A projection-space certainty (PC) map representing CL for the selected AF is generated based on IC map. An emission image of the target volume is initialized. The selected AF and emission image are iteratively updated based on the ES data, PC map, initial AF, and/or initial emission image. A desired emission image and/or AF values are determined based on the iteratively updated AF and/or emission image.

An organic light emitting display device includes data lines, selection scan lines, and emission scan lines for transmitting data signals, selection signals, and emission signals, respectively. Pixel circuits are arranged at regions defined by the data lines and the selection scan lines. A first scan driving unit outputs the emission signals. The first scan driving unit includes conversion circuits, each of the conversion circuits including conversion circuit transistors of an identical channel type. Each of the conversion circuits receives a first signal, a second signal, a third signal and a conversion circuit clock signal, and outputs a conversion output signal as a respective emission signal of the emission signals.

An apparatus for analyzing an integrated circuit to which one or more test signals are applied. An example apparatus includes an objective lens that views reflections from the integrated circuit, a device that houses at least two optical fibers, a component that receives reflections from the objective lens and directs the received reflections to the device, and a photo-diode that receives a reflection received by the device. The apparatus includes a beam splitter that directs reflections from the integrated circuit to a detector. A processing device generates an image signal based on a signal received from the detector and a display outputs an image based on the image signal. The component includes a scan mirror that reflects the collimated reflections to a collimating lens that focuses the reflections from the scan mirror toward the device.

The invention discloses a radiation inspection system, which is characterized in that a radiation device is arranged at the bottom of a radiation inspection channel and used for emitting scanning ray beams to a detection area; one or more detectors is/are arranged at the top and/or the lateral of the radiation inspection channel and used for receiving imaging ray beams which are transmitted or scattered from a detected object in the detection area; a dragging device is arranged at one side or both sides in the radiation inspection channel and used for dragging the detected object to travel along the traveling direction; and a control device controls the radiation device to emit the scanning ray beams to the detection area in a first operation mode under a condition that the detected object passes the radiation inspection channel under a driving effect of its own, and controls the radiation device to emit scanning ray beams to the detection area in a second operation mode under a condition that the detected object passes the radiation inspection channel under a dragging effect of the dragging device. Therefore, the quality of formed images can be improved, the height of the overall radiation inspection system is reduced, and dual-mode scanning is achieved.

Systems and techniques are provided for a directional antenna system that employs a wireless link between x-ray apparatus. The system includes a host computer, an x-ray tube with an emission scan channel, a first directional antenna connected to the x-ray tube and with an orientation parallel to the emission channel, a second antenna wirelessly communicating with the first directional antenna, an x-ray detector wirelessly communicating with the x-ray tube, and a rigid panel supporting the second antenna and the x-ray detector being in contact with the emission scan channel. Specific techniques are employed to manage antenna direction and transmission.

The invention discloses a rapid screening method of the thermoelectric material with optimized performance; the method comprises the following steps: firstly using a plasma activation sintering technology to prepare a multi-element chalcogenide system diffusion couple, thus obtaining a block material sample bank with rich compositions and microstructures; combining an EPMA (electron probe X ray microscopic analyzer), a FESEM (field emission scan electron microscope) with a PSM (conductivity-Seebeck coefficient scan probe microscope) symptom technologies so as to study the relations between the sample bank composition, structure and thermoelectricity performance, thus screening out the high performance thermoelectric material with specific compositions and microstructures with high flux. The method can effectively improve the information density and efficiency obtained by tests, thus obvious reducing test needing manpower, material resources and cost, and searching the thermoelectric material with excellent performance with high efficiency.

Methods and systems are provided for scatter correction in Positron Emission Tomography (PET) imaging. In one embodiment, a method comprises performing an emission scan to acquire emission data, identifying outliers in a tail region of the emission data, discarding a portion of the outliers from the emission data, calculating a linear fit to remaining emission data in the tail region, and correcting the emission data based on the linear fit. In this way, scatter coincidence events can be eliminated even if the emission data is spatially misaligned with transmission data.

The invention discloses a peak conversion method of three-dimensional fluorescence spectra under different photomultiplier tube voltages. The method includes two steps of numerical correction and peak conversion. Numerical correction includes: setting the determination conditions; respectively determining three-dimensional three-dimensional fluorescence spectra of deionized water and a calibration reagent quinine sulfate; reading a Rayleigh scattering value in the three-dimensional fluorescence spectrum of deionized water at the excitation wavelength Ex equal to emission wavelength Em of 350 nm and the peak of the quinine sulfate solution under the same conditions (PMT voltage, excitation-emission scanned area); and conducting linear fitting of the two values, and determining the accuracy of the three-dimensional fluorescence data according to the results of the linear fitting. Peak conversion includes: conducting linear fitting of the peak of a sample under a known voltage and specific wavelength range and the Rayleigh scattering value in the three-dimensional fluorescence spectrum of deionized water at the excitation wavelength Ex equal to emission wavelength Em of 350 nm under corresponding voltage; and converting the peak of the sample into corresponding peaks under different voltages according to the obtained linear equation.

The invention provides an ultrasonic color blood flow imaging technology in order to improve the frame frequency of ultrasonic color blood flow and output a blood flow velocity diagram with undamaged resolution. Firstly, a color blood flow emission control mode is set based on emission scanning density parameters, that is, a corresponding emission control working mode is formed along with the change of scanning density levels; wherein the scanning density is set to be multi-stage adjustable, each stage corresponds to one emission working mode, and different working modes have different emission scanning line distances. Then, according to the received echo data, virtual receiving line data is constructed according to the corresponding distance between the emission scanning lines to form a new receiving data set; and finally, corresponding post-processing is performed on the new received data, and an image is interpolated and output. Experimental verification shows that especially for some platforms with limited logic resources, storage resources and transmission rate, the method for increasing the distance between the emission scanning lines and constructing the virtual receiving line data can not only improve the color blood flow imaging frame rate, but also ensure that the resolution of the image is not influenced.

The invention relates to the field of alloy grain size measurement, and particularly discloses a method for measuring the uniformity of a nanocrystalline hard alloy. The method comprises three steps of: sample preparation, observation and statistics. The sample preparation comprises mirror polishing and metallographic corrosion steps, wherein the metallographic corrosion comprises the steps of: first-time WC corrosion, cobalt-phase corrosion and second-time WC corrosion. In the observation step, a field emission scanning electron microscope is used, and a 20000-40000-time microscopic structurepicture is shot through back scattering electron imaging. The statistics is characterized in that measurement software is used for measuring the grain size of each grain of the alloy, counting data and drawing a grain size distribution diagram to represent the uniformity of the alloy. The method is suitable for measuring the uniformity of the WC/Co hard alloy taking Co as a binding phase, and isfurther suitable for measuring the uniformity of the nanocrystalline hard alloy taking any one of cubic phase carbide, TiC and Ti (C.N) as an inhibitor. By applying the method, the measurement of theuniformity of the nanocrystalline hard alloy can be simply and quickly completed, and the image resolution can be remarkably improved.

The invention relates to a low-dose miniature cone beam CT scanning system and method based on an X-ray lens. The system comprises a micro-focal spot X-ray source with a capillary focusing X-ray lens, a flat panel detector and an electric rotary translation stage, the micro-focal spot X-ray source with the capillary focusing X-ray lens comprises an X-ray controller and an X-ray tube which are used for emitting scanning light; the electric rotary translation table comprises an electric rotary table and a sample fixing device and is used for carrying out three-dimensional scanning on a sample; the flat panel detector is used for converting an optical signal into a digital signal; and the main control computer is used for controlling the micro-focal spot X-ray source, the flat panel detector and the electric rotary translation stage to carry out signal acquisition, control and image reconstruction. By adopting the system and the method, the problem of image uniformity deterioration caused by the X-ray beam hardening effect can be effectively relieved, penumbra blurring and the hardening artifact effect of the X-ray beam are reduced, the uniformity of the image is improved, and a CT scanning image with higher resolution is obtained.