474 results about "Two dimensional imaging" patented technology

An X-ray tomosynthesis system as an X-ray diagnostic system is provided. The system comprises an X-ray generator irradiating an X-ray toward a subject, and a planar-type X-ray detector detecting the X-ray passing through the subject and outputting two dimensional imaging signals based on the detected X-ray. The system comprises a supporting/moving mechanism supporting at least one of the X-ray generator and the X-ray detector so that the at least one is moved relatively to the subject. The system also comprises an element setting a ROI position of the subject, an element for obtaining a plurality of three dimensional coordinates of pixels included in the ROI, a calculating element obtaining two dimensional coordinates of data in the two dimensional imaging signals for each of the two dimensional imaging signals detected by the X-ray detector, the data being necessary for obtaining pixel values of the three dimensional coordinates; and an element for obtaining the pixel value of each of the three dimensional coordinates by extracting the corresponding data of the two dimensional coordinates from the detected two dimensional imaging signals and adding the extracting data.

A surface inspection apparatus and a method are provided which include an illumination system configured to focus a beam of radiation at a non-orthogonal incidence angle to form an illumination line on a surface substantially in a plane of incidence of the focused beam. The apparatus and method further include a collection system configured to image the illumination line onto an array of detectors oriented parallel to the illumination line. The collection system includes an imaging lens for collecting light scattered from the illumination line, a focusing lens for focusing the collected light, and the array of detectors, each configured to detect a corresponding portion of the illumination line. The collection system may be configured to image the illumination line such that the width of the imaged illumination line on the array of detectors is larger than the pixel size of the detectors along the same direction.

The invention provides a car-mounted imaging apparatus that renders a frame rate variable and yet does not spoil image quality and does not either invite the drop of sensitivity and deterioration of an S/N ratio. The car-mounted imaging apparatus 1 has two-dimensional imaging means (pixel unit 3, vertical scanning unit 4, horizontal scanning unit 5, output unit 7) having a large number of pixels 2 arranged in a two-dimensional matrix, and pixel information addition means (pixel switch control unit 8) for combining a plurality of pixels 2 and adding and extracting their pixel information. When the number of combination of the pixels 2 is changed, a frame rate becomes variable.

A method of objectively quantifying assessments of joints having arthritis for purposes of assessment, diagnosis and treatment. The objective measurements utilize known imaging modalities including 3D scanning, thermal imaging, visible and near-infrared imaging and two-dimensional imaging to quantify swelling, heat distribution, erythema, and range or motion. The objective measurements can be combined in various ways to assess the extent of the disease and can be used to adjust treatment protocols.

The invention provides a time-resolved single-photon counting two-dimensional imaging system and a time-resolved single-photon counting two-dimensional imaging method and belongs to the technical field of extremely-weak light detection. A trigger 2 is triggered to start sampling, centralized sampling is performed at t time intervals, and measurement and counting are performed if light comes at the intervals, so that time resolving of an extremely-weak light object is realized, and a time sequence image is generated. Imaging is performed on the basis of a compressive sensing (CS) theory, a digital micro-mirror device (DMD5) performs linear random projection on a compressible two-dimensional image, the compressible two-dimensional image is optically modulated and then synchronously detected by using a single-photon counter, and a high-resolution extremely-weak light image can be reconstructed by a small amount of sampling operation. The measurement process is linear and non-adaptive, the reconstruction process is non-linear, and the invention has the advantages of high generality, robustness, expandability, superposition and computation asymmetry, and can be widely applied to the fields of life science, medical imaging, data acquisition, communication, astronomy, military affairs, hyper-spectral imaging and quantum measurement.

A machine for detecting sulfur hexafluoride (SF6) leaks using the mid-infrared differential absorption lidar (DIAL) technique with a commercically available, air-cooled, compact, pulsed transversely-excited-atmospheric (TEA) carbon dioxide (CO.sub.2) laser, a Cassegranian optical telescope for focusing both the laser emission and returning reflected signal, a user-operated focusing mechanism, a two-dimensional, thermoelectrically-cooled focal plane array (FPA) sensitive in the mid-infrared wavelength range (10.2-10.6 micrometers), a charge-coupled device (CCD) for 2-D imaging, a computer-based control system to rapidly switch the laser wavelength between 10.2470 micrometers, 10.7415 micrometers, and 10.5518 micrometers to utilize the Differential Absorption Lidar (DIAL) chemical detection technique, a rechargeable battery pack and power supply, and an image and data storage device using a solid-state memory stick.

The invention discloses a spatially-separated pump-probe transient absorption spectrograph and a realization method. The realization method is characterized by generating a light source through a femtosecond light source system; realizing the beam splitting of pump light and probe light through a beam splitter; realizing the different time delay of the probe light through a time delay line; realizing the two-dimensional rotation and the calibration of the probe light within a horizontal plane and a vertical plane through a sweep reflector group; calibrating which means guaranteeing the incidence of the rotated probe light into a aperture within the front section of an objective lens; finally, obtaining a two-dimensional image formed on a sample under the combined action of the probe light and the pump light by a data collection system. According to the spatially-separated pump-probe transient absorption spectrograph and the realization method, the extremely high spatial discrimination can be realized, and moreover, the visual probe of carriers, excitors or plasmons can be realized.

A two-dimensional imaging surface plasmon resonance (SPR) apparatus for optical surface analysis of a sample area on a sensor surface is disclosed. The apparatus comprises a sensor surface layer of a conductive material that can support a surface plasmon, such as a free electron metal, e.g. gold, silver or aluminum, a source of electromagnetic beams of two or more wavelengths that illuminate a two-dimensional surface area from either the front or the backside of the sensor surface layer, and a detector for simultaneous, or pseudo simultaneous, detection of two or more wavelengths of reflected intensities from the two-dimensional surface area, providing two or more two-dimensional images of the surface area, the two-dimensional images being a function of the effective refractive index at each point on the surface area. The two-dimensional images put together result in a color image. The apparatus is suitable for use in biological, biochemical, chemical and physical testing.

A high intensity focused ultrasound therapeutic system guided by an imaging device is provided and includes an ultrasound therapeutic applicator which contains an ultrasound transducer (8), a therapeutic bed (11), on which a patient (17) lies, and an imaging device used for imaging a diseased tissue (3). Wherein, the imaging device is a non-ultrasound imaging device with two-dimensional imaging function. The ultrasound transducer (8) with the diameter of focal core (23) ranging from 0.1 mm to 5 mm, preferably, ranging from 0.2 mm to 2 mm, in a biological focal region (2) located in the diseased tissue (3) is adopted. The non-ultrasound imaging device is a CT or an MRI device with two-dimensional imaging function. The present invention can image the target accurately, so it can be applied to all kinds of complicated surgeries and has good therapeutic effects.

An imaging system includes n or more photographing optical system having an imaging optical system having a full angle of view A (degree) larger than 360/n where n is a natural number of 2 or more and a two-dimensional imaging element configured to convert light condensed by the imaging optical system into an image signal, wherein in the imaging optical system of each of the imaging optical systems, a magnification per unit angle of view monotonically increases from 0 to 360/n-degree angle of view, and an increase rate of the magnification monotonically decreases to the full angle of view A (degree) after the 360/n-degree angle of view.

The invention discloses a telescopic array type portable MIMO-SAR (multiple-input multiple-output synthetic aperture radar) measurement radar system and an imaging method thereof. The system comprises a telescopic MIMO antenna array, a radar transmitting/receiving machine, a control and processing computer, a liftable antenna frame and the like. The system has the advantages in an aspect of meeting field diagnosis and measurement of scattering properties in using and maintenance processes of a low detectable target that firstly, quick detection, positioning and imaging diagnosis of an abnormal scattering part of the low detectable target can be realized, that is, an MIMO-SAR different from a linear guiderail SAR in mechanical scanning imaging can finish high-resolution two-dimensional imaging of a measured target through one-time or two-time 'snapshot' electric scanning imaging; secondly, the requirement on a target test site environment is lowered, that is, guide rails for precision mechanical screening measurement do not need to be mounted in a target test site, so that the requirement on the site test environment in imaging diagnosis and measurement operation processes is greatly lowered; thirdly, the antenna array is telescopic, so that miniaturization, quick unfolding and folding as well as portability of the measurement radar system can be easily realized.

The invention discloses a non-uniform distributed multi-baseline synthetic aperture radar three-dimensional imaging method, and relates to the three-dimensional imaging technology. The method comprises the following steps of: performing two-dimensional focusing on primary echo data obtained by flying observation at each time to obtain single-look complex images; registering sequences of the single-look complex images to acquire non-uniform sampling data of an observation target under different visual angles; removing inclination aiming at the non-uniform sampling data to perform phase modulation; then estimating a spatial spectrum of the primary uniform sampling data by using a missing data-based amplitude phase estimation method and maximizing mathematically expected iterative operation of observation data so as to implement imaging of a target height direction; and finishing three-dimensional imaging of the target by combining a two-dimensional target image obtained in two-dimensional imaging of each track. The method for performing the imaging of the height direction based on the amplitude phase estimation method reduces elevation blur caused by multi-baseline non-uniform distribution and acquires clear high-resolution target three-dimensional imaging results.

The invention relates to a method for comprehensively measuring reflectivity, which comprises the following steps: dividing continuous incident laser beams into a reference beam and a detection beam, wherein the reference beam is focused on a photoelectric detector for direct detection and the detection beam is injected into an optical resonant cavity; using a cavity ring-down technology to measure an optical element with reflectivity more than 99%, respectively measuring a ring-down time tau 0 of an original optical resonant cavity output signal and a ring-down time tau 1 of the measured optical resonant cavity output signal after an optical element to be measured is added, and calculating the reflectivity R of the optical element to be measured; using the spectrophotometry to measure the reflectivity of the optical element to be measured when the R value is less than 99%; moving away an output cavity mirror; focusing detecting light reflected by a measuring mirror on the photoelectric detector for detecting while recording a light intensity signal ratio of the detection beam to the reference beam; and calibrating to further obtain the reflectivity R of the optical element to be measured. The device for measuring reflectivity can be used for measuring optical elements with any reflectivity and also can be used for realizing the high-resolution two-dimensional imaging of the reflectivity distribution of a large-aperture optical element.

The invention discloses a synthetic aperture radar imaging method based on L<1/2> regularization and relates to a radar two-dimension imaging technology. The synthetic aperture radar imaging method includes the steps of a, establishing a synthetic aperture radar imaging model based on the L<1/2> regularization according to a synthetic aperture radar observation model; and b, using an iteration half threshold value algorithm to reconstruct an observation scene backscattering coefficient. Compared with traditional synthetic aperture radar imaging methods, the synthetic aperture radar imaging method is capable of reducing a sampling quantity required by the correct reconstruction of an objective scene and achieving effective imaging of synthetic aperture radar data.

An ultrasound-imaging system and method is provided that permits an operator to acquire an image of a volume-of-interest in a time critical fashion, that is capable of referencing the volume rendering to a standard two-dimensional imaging mode, and permits the operator to selectively choose a number of display-mode parameters that result in an operator directed view of the volume-of-interest. The ultrasound-imaging system comprises an input device configured to receive a plurality of imaging parameters and a controller in communication with the input device. The ultrasound-imaging system generates an operator-directed transmit-beam scan sequence in response to the imaging parameters and transmits a spatially modified transmit-beam scan sequence over a portion of the volume-scan range of the ultrasound-imaging system. Moreover, the ultrasound-imaging system provides the flexibility for an operator to direct a plurality of operator-configurable multi-dimensional views.

The invention discloses an SAR (synthetic aperture radar) tomography super-resolution imaging method. The SAR tomography super-resolution imaging method includes registering obtained two-dimensional imaging results of various SAR tomography baselines, creating height-direction signals pixel by pixel according to the sequence of the baselines, realizing frequency modulation correction and constructing a redundancy matrix; and modeling a height-direction imaging problem into a sparse signal reconstruction problem according to the characteristic of sparsity of height-direction scattering coefficients, computing a sparse solution of the spares signal reconstruction problem by means of iteration by the aid of the constraint condition of the minimum weighted norm, and realizing height-dimensional imaging of an object. The method is applied to SAR tomography height-dimensional imaging, and problems that the quantity of two-dimensional SAR images in the same area and (/or) trajectory distribution is uneven, and only a few parts of trajectory intervals (baselines) meet the Nyquist sampling theory are solved. In addition, by the aid of the method, energy of the object is more concentrated, namely, the resolution is improved, and the problem that the quantity of baselines is small is solved.

The invention discloses a radar target two-dimensional imaging method based on vortex electromagnetic waves. The radar target two-dimensional imaging method is based on an echo model of ideal scattering points under projection of the vortex electromagnetic waves generated by a uniform loop antenna array, performs orbital angular momentum (OAM) mode sampling on radar target echo signals and calculates a related function, adopts a multiple signal classification (MUSIC) algorithm to obtain a spatial spectrum function, and carries out two-dimensional spectrum peak searching to realize two-dimensional joint detection of a pitch angle and an azimuth angle of a radar target. Compared with a traditional direction-of-arrival (DOA) estimation scheme based on a plane wave MUSIC algorithm, the radar target two-dimensional imaging method provided by the invention can realize higher angular resolution; and compared with an existing radar target azimuth angle imaging scheme based on vortex electromagnetic waves, the radar target two-dimensional imaging method can realize the imaging of the target pitch angle without increasing hardware cost, and is of great reference significance to the modern radar design of the new system.