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.

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.

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.

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.

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.