695results about How to "Improve imaging effect" patented technology

The invention discloses a casting product appearance defect detection method and system based on machine vision, and particularly relates to the technical field of casting product defect detection. According to the method, casting materials of a production line are divided into different categories, the casting materials with abnormal absorptivity are identified, terahertz wave scanning is carried out on the casting materials, scattering images are obtained, and the stability of scattering point density distribution is evaluated; scanning by using a terahertz time-domain spectrometer, analyzing an amplitude fluctuation state of a time-domain signal and evaluating a waveform distortion degree; after comprehensive analysis, the quality of images captured by the imaging system is evaluated, the images are divided into different grades, defect detection is directly carried out on high-quality images, the quality images are centered, the accuracy of the images is analyzed, and the transmitting power and the scanning speed of terahertz imaging equipment are dynamically adjusted, so that the imaging quality is improved, and the accuracy and the efficiency of detection are remarkably improved; and the quality and safety of casting products are ensured, and the product quality problem and potential equipment faults caused by untimely defect detection are effectively avoided.

The invention belongs to the technical field of fundus imaging, and discloses an ultra-wide-angle ellipsoid confocal laser scanning fundus imaging system, which comprises a light splitting module, a light condensing module, a scanning module, a transmitting mirror group, an ellipsoid reflector and a detection module, wherein the center of the scanning module and the center of the transmitting mirror group are located on the same optical axis A, the pupil of the human eye is located at the first focus of the ellipsoidal reflector, and the entrance pupil of the transmitting mirror group is located at the second focus of the ellipsoidal reflector; and the transmitting lens group comprises a movable focusing lens and is used for changing the position of a first image surface of light reflected by the retina of the human eyes when moving along the optical axis A so as to realize clear imaging of the retina of the human eyes with different diopters. Under the condition that a free-form surface is not introduced, ultra-wide-angle multi-wavelength confocal laser scanning fundus imaging with the single intraocular field angle of 200 degrees is achieved, and the full-field optical resolution reaches 15 micrometers. And by moving the focusing lens, imaging compensation can be carried out on human eyes with diopters of-15D to + 15D.

The invention relates to the technical field of intelligent monitoring, in particular to a road monitoring device based on multi-source data fusion, which comprises a distributed fiber bragg grating sensing module for collecting various data of each monitoring area of a roadbed and a road surface; the optical signal processing module is used for analyzing the data acquired by the distributed fiber grating sensing module and judging whether the data exceed respective threshold values or not; the imaging radar and the low-illumination camera are used for acquiring radar point cloud images and visible light images of a road and a slope area; the image processing module is used for fusing the radar point cloud image and the visible light image of the same monitoring area and identifying whether rockfall, fracture or collapse conditions exist in each monitoring area on the road or not; and the alarm module is used for sending out a corresponding alarm signal when any one of the data acquired by the distributed fiber grating sensing module exceeds a threshold value or rockfall, fracture or collapse conditions exist in a certain monitoring area. According to the invention, the monitoring precision of road abnormal conditions can be improved.

The invention discloses a differential polarization confocal microscopic imaging system and method of a multi-focus channel, and relates to the technical field of optical microscopy. Comprising a light source emission module, a dichroscope (6), a two-dimensional galvanometer module, a scanning module, a sample acquisition module, a detection module and an imaging terminal (17). According to the invention, differential polarization imaging and a multi-focus channel confocal technology are combined, so that the imaging quality of the confocal microscopic system is further improved on the premise of ensuring the confocal imaging speed; meanwhile, differential imaging is introduced, so that the imaging contrast ratio can be greatly improved, and the confocal microscopic system can obtain a better imaging effect in the application field of thick tissue microscopic imaging.

The invention relates to an AR near-to-eye display technology, in particular to a two-dimensional vector body holographic grating waveguide and a manufacturing method thereof, an AR optical module and a manufacturing method, and the method comprises the steps: fixing a holographic plate to be exposed, and building a rectangular coordinate system with a second surface of the holographic plate as an XOY plane; dividing the same exposure light into a first light beam and a second light beam, enabling the first light beam to vertically irradiate the first surface of the holographic plate, and enabling the second light beam to irradiate the second surface of the holographic plate at a # imgabs0 # incident angle so as to form a volume holographic grating with a first grating component; enabling the first light beam to vertically irradiate the first surface of the holographic plate, and enabling the second light beam to irradiate the second surface of the holographic plate at a # imgabs1 # incident angle to form a volume holographic grating with a second grating component; wherein the propagation direction of the orthographic projection of the volume holographic grating vector of the first grating component on the second surface and the propagation direction of the orthographic projection of the volume holographic grating vector of the second grating component on the second surface are symmetric about the X axis.

The invention relates to a terahertz radar imaging system based on four-inch spinning, which belongs to the technical field of terahertz wave imaging and comprises a femtosecond laser light source, a beam splitter, a laser pumping terahertz transmitting module, a detection laser transmission module and a terahertz detection module which are arranged along the laser incidence direction. An efficient, large-size and ultra-wideband terahertz radiation source and a radar imaging device are fused, high-signal-to-noise-ratio and high-resolution terahertz imaging of a large-size target is achieved, and the system is low in cost, easy to construct, free of complex parabolic mirror combination, firm and reliable in performance and suitable for large-size target imaging. And the requirements of various engineering application scenes on synthetic aperture and nondestructive detection imaging can be practically met.

The embodiment of the invention provides an AR lens module and optical display equipment. The AR lens module is used for a full-color AR light machine, and comprises a lens group, an X-cube color combination prism and a display chip which are arranged along the same optical axis, wherein the lens group is composed of a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence, and the fourth lens and the X-cube color combination prism are arranged adjacently; the focal power of the first lens and the third lens is positive, and the focal power of the second lens and the fourth lens is negative; the first lens, the second lens, the third lens and the fourth lens are all aspherical mirrors. The CRA of the AR lens module is 13 degrees, and the CRA is the included angle between the chief light of the edge field of view and the optical axis of the display chip.

The invention relates to a variable sampling start-based satellite-borne sliding spotlight SAR data processing method, which comprises the following steps of: carrying out distance direction blocking on echo data of variable sampling start, carrying out Fourier transform on sub-block data along the distance direction, multiplying by a phase compensation function, and carrying out sampling start alignment; performing two-step azimuth frequency domain aliasing removal on the sub-block data after sampling initial alignment; performing two-dimensional frequency domain matched filtering on the sub-block data after the azimuth frequency domain aliasing is removed; carrying out resampling on the sub-block data subjected to two-dimensional frequency domain matched filtering; and splicing the resampled sub-block data to obtain an imaging result of the whole imaging scene. According to the method, sampling initial alignment is carried out through a distance frequency domain azimuth time domain phase compensation function, zero padding does not need to be carried out on echo data, and the data processing difficulty is reduced; the focusing quality is improved by eliminating azimuth frequency domain aliasing, two-dimensional frequency domain matched filtering and two-dimensional frequency domain resampling.

The invention relates to the technical field of medical instruments, in particular to an oral cavity opening device clinically applicable to the stomatology department, and aims to solve the technical problems that an existing oral cavity opening device is simple in structure and single in function, the opening size cannot be freely adjusted, and meanwhile during examination, the opening size cannot be freely adjusted. In the prior art, medical staff need to observe pathological changes in the oral cavity of a patient with naked eyes, efficiency is low, and the risk of cross infection is brought to the medical staff. According to the technical scheme, the device comprises a fixing support, two positioning blocks are fixedly installed in an inner cavity of the fixing support, and a limiting rod is rotationally connected between the opposite sides of the two positioning blocks through a bearing. The oral cavity expanding device has the advantages that by arranging the expanding unit, the opening and closing degree of the oral cavity of a patient can be adjusted, by arranging the positioning unit, the expanding unit can be positioned, the use stability of the expanding unit is improved, by arranging the camera shooting mechanism, the oral cavity of the patient can be shot, and cross infection caused by visual inspection of medical staff is avoided.

The invention relates to a medium-wave infrared microscopic imaging lens for an optical transfer function measuring instrument, and relates to the technical field of optical testing. The medium-wave infrared microscopic imaging lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along a light path propagation direction, and an aperture diaphragm is arranged on the incident plane of the sixth lens. The medium-wave infrared microscopic imaging lens for the optical transfer function measuring instrument is formed by connecting the infinity objective lens with the infinity tube lens, and the lens is suitable for medium-wave microscopic imaging and excellent in imaging performance; tolerance capacity is loose, and processing and adjustment are easy; the testing efficiency is high, the cost is low, and the practical application value is achieved.

The invention discloses a heating structure used in a scanning electron microscope and a use method of the heating structure, and relates to the technical field of scanning electron microscope high-temperature performance tests.The heating structure comprises a laser, a shell module, a laser clamping module and an electron back scattering diffraction scanning fixing module, and the upper surface of the electron back scattering diffraction scanning fixing module is obliquely arranged; the laser clamping module is installed on the electron back scattering diffraction scanning fixing module, the shell module is installed above the laser clamping module, a heating dodging plate used for placing a sample to be tested is arranged in the shell module, and the laser clamping module is used for clamping a laser lens of a laser. Laser beams output by the laser lens are irradiated on the heating dodging plate, the two ends of the to-be-tested sample extend out of the shell module and are connected with the stretching table, and an observation hole for observing the sample is formed in the upper end of the shell module. According to the invention, the imaging definition of the scanning electron microscope can be improved, and the in-situ high-temperature mechanical property test and the EBSD high-temperature analysis experiment in the scanning electron microscope can be smoothly carried out.

The invention discloses an optical lens, which comprises seven lenses and a liquid lens, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface and the image side surface of the third lens are convex surfaces; the object side surface and the image side surface of the fourth lens are convex surfaces; a liquid lens with focal power, wherein the liquid lens presents different focal lengths according to different applied voltages; the fifth lens has positive focal power, and the object side surface and the image side surface of the fifth lens are convex surfaces; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a convex surface; and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface. The optical lens provided by the invention has the advantages of small total length, high relative illumination, high resolution and the like.

The invention discloses a multi-spectral imaging system and method in a single-pixel type ultraviolet-visible-infrared wide spectral range. The system comprises a light source module, a modulation device, a lens group, a multi-spectral detection module, a multi-channel data acquisition module and a data processing module, according to the invention, a plurality of narrow-band detectors with different spectral responses are introduced into the multispectral detection module, so that additional light splitting devices and light filtering devices are avoided, parameters such as view fields, view angles and pixel numbers of images obtained by using different narrow-band detectors are completely the same, the problem of image registration does not exist, and data analysis and image fusion are facilitated; in addition, the size of the narrow-band detector is basically not limited and can reach the centimeter magnitude, and the imaging capability is improved under the condition of weak light. The multispectral imaging system provided by the invention has the characteristics of single-pixel imaging, large number of spectrums, wide spectral range, high imaging speed, good temporal-spatial resolution and small size.

The invention discloses intelligent three-dimensional projection display equipment, and relates to the technical field of three-dimensional projection equipment, the intelligent three-dimensional projection display equipment comprises a shell, a base and holographic projection glass, the base is fixedly connected in the shell, the number of the holographic projection glass is four, the four pieces of holographic projection glass are fixedly connected with one another and fixedly connected to the base, and the holographic projection glass is arranged in the shell. The holographic projection equipment comprises a shell, holographic projection glass is arranged on the shell, projection equipment is arranged on the upper portion of the holographic projection glass, a display screen is fixedly connected to the outer side of the shell, an access door is hinged to the outer side, close to the display screen, of the shell, and a shielding assembly capable of shielding the projection display equipment according to light rays is installed in the shell. The problems of light reflection, color fading, blurring and the like of a projection picture are avoided, the shading cloth can reduce the influence of ambient light on projection light rays, accurate restoration of colors is ensured, and the position and the unfolding size of the shading cloth can be flexibly adjusted, so that the shading applicability is improved.

The invention belongs to the field of particulate matter optical sensing, and particularly relates to a particulate matter light scattering signal acquisition method and device, and the method comprises the steps: controlling scattered light with different scattering angles generated by particulate matter to be detected to reach a digital micromirror device DMD; enabling scattered light of different scattering angle combinations to reach a photoelectric detector by utilizing an on state and an off state of each micromirror in the DMD so as to realize multiple acquisition of scattered light signal intensity by the photoelectric detector and obtain a measurement signal vector S; wherein when a single micro-mirror is turned on, scattered light reaching the micro-mirror is focused on the photoelectric detector through the micro-mirror according to a preset light path, and when the single micro-mirror is turned off, the scattered light reaching the micro-mirror is diffused to an area outside the photoelectric detector; 1 norm minimization is carried out on X = (phi psi)-1S, and X and a sparse domain psi are determined; and performing inversion according to P = psi X to obtain the scattered light intensity P of different scattering angles generated by the particulate matter to be measured. According to the invention, the collection efficiency of scattered light intensity spatial distribution can be improved.

The invention provides an image processing method and device, electronic equipment, a chip and a storage medium, and relates to the field of image processing.The method comprises the steps that a reference image is determined from multiple frames of shot images based on quality scores of the multiple frames of shot images; wherein the multiple frames of shot images are obtained by shooting the same shot object by adopting different shooting view angles; performing shadow correction on the multiple frames of shot images based on shadow areas in the multiple frames of shot images to obtain multiple frames of corrected images; based on the homography matrix of the multiple frames of shot images, aligning the multiple frames of corrected images to the reference image to obtain multiple frames of aligned images; wherein the homography matrix is used for indicating a perspective transformation relation of distortion of the shot image to the first reference image; and performing image synthesis according to the multiple frames of aligned images to obtain a target image. Therefore, the problem of shadow shielding caused by illumination can be eliminated, and the imaging effect is improved. In addition, assistance of depth-of-field information and multi-exposure is not needed, and the complexity of image processing can be reduced.

The invention relates to the technical field of medical equipment, in particular to an endoscope lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis. Each lens is provided with an object side surface which faces the object side and enables imaging light to pass through and an image side surface which faces the image side and enables the imaging light to pass through; the first lens has a positive refractive index, the second lens has a positive refractive index or a negative refractive index, the third lens has a positive refractive index, the fourth lens has a negative refractive index, the fifth lens has a positive refractive index, and the sixth lens has a negative refractive index. The invention can be used for label-free quantitative phase microscopic imaging, and can avoid the problems of adverse reaction and sequelae caused by the use of a fluorescent agent in a fluorescent confocal endoscope; a special dispersion glass material and a strong and weak dispersion glass material are combined to eliminate chromatic aberration, so that the near 100nm broadband achromatic effect is realized.

The invention provides a double telecentric projection objective for focusing and leveling, which is applied to the technical field of semiconductor equipment manufacturing, the double telecentric projection objective comprises an object plane, a front lens group, an aperture diaphragm, a rear lens group and an image plane which are sequentially arranged along an optical axis direction, and the front lens group and the rear lens group are symmetrically arranged along the aperture diaphragm. Therefore, the double-telecentric projection objective lens is of a refraction type and symmetrical object space and image space double-telecentric structure. The double-telecentric projection objective lens adopts a refraction type structure, compared with a reflection type structure, the double-telecentric projection objective lens is beneficial to reducing detection, installation and adjustment difficulty and reducing cost, and the double-telecentric projection objective lens adopts a symmetrical double-telecentric structure and has the advantages of being simple in structure, low in cost and good in imaging performance.

The invention discloses an on-chip plasma scattering microscope based on a one-dimensional photonic crystal, which belongs to the field of imaging and detection of surface waves on small-particle weak signals and comprises an image plane detector, an imaging tube lens, an air objective lens, a gold film, the one-dimensional photonic crystal, a scattering layer and an LED light source. And refractive index matching oil is dripped between the gold film and the one-dimensional photonic crystal and between the photonic crystal and the scattering layer for adhesion. After light beams emitted by the LED light source pass through the scattering layer, the light beams are scattered to various angles, the light beams are filtered and screened by the one-dimensional photonic crystal in a momentum space, surface plasmon polaritons of a gold film and an air interface can be excited in all directions, nanoscale particles placed on the gold film are illuminated, and scattered light of the particles is collected by the air objective lens placed above. According to the invention, the interaction between light and nano particles is greatly improved, the scattering signal intensity of the particles is increased, the imaging quality is improved, and the nano particles with very small scattering signals can be imaged and detected.

The utility model discloses a macro photography optical system, and particularly relates to the field of optical imaging, and the macro photography optical system comprises a bonding lens, a focusing group lens, a rear focusing lens group and an image plane lens which are sequentially arranged from the object side to the image side along the optical axis direction. According to the invention, the spherical lens made of a full-glass material is adopted, the variable aperture is arranged between the focusing groups and moves along with the focusing groups, the aberration level at each focusing distance is improved and balanced, and the combined balsaming lens has an aberration eliminating function and is fixed relative to an imaging surface; dust, water vapor and the like are prevented from entering the lens when the focusing group moves, the last lens of the lens group is arranged to be a convex lens, the effects of reducing the main light incident angle of each view field and increasing the back focal length are finally achieved, the lens group is suitable for a single lens reflex camera, a micro single camera and even a film camera, and a good imaging effect is achieved.

The embodiment of the invention provides a semiconductor device and a forming method thereof. The semiconductor device comprises a first functional layer, a first absorption layer and an avalanche layer, wherein the first absorption layer and the avalanche layer are located on the top surface and the bottom surface of the first functional layer respectively; the first absorption layer is used for absorbing photons and generating photon-generated carriers; the first functional layer is used for reflecting photons which are not absorbed by the first absorption layer back to the first absorption layer and transmitting photon-generated carriers generated by the first absorption layer to the avalanche layer; and the avalanche layer is used for enabling the photon-generated carriers entering the avalanche layer to trigger an avalanche effect so as to generate avalanche current.

The invention relates to the technical field of medical instruments, and provides a radio frequency gold microneedle control system based on subcutaneous impedance identification, and a radio frequency gold microneedle is provided with an electrode array for impedance tomography. Comprising the following steps: an impedance distribution reconstruction module generates reconstructed impedance distribution from a voltage signal of subcutaneous tissue collected by an electrode array through an impedance distribution reconstruction model based on a genetic algorithm; the impedance imaging module generates an impedance distribution image for reflecting subcutaneous tissue impedance distribution from the reconstructed impedance distribution through an impedance rate segmentation model based on a UNet architecture; the depth control module determines the recommended depth of the radio frequency gold microneedle according to the impedance distribution image; and the radio frequency energy control module adjusts control parameters of a control algorithm for controlling the radio frequency energy of the radio frequency gold microneedle according to the plurality of impedance distribution images. Accurate segmentation judgment and better imaging effect on impedance distribution are achieved, and then impedance imaging is applied to depth and energy pulse control of the radio frequency gold microneedle.

The invention belongs to the technical field of X-ray detection, and particularly relates to lead-free two-dimensional double perovskite, a preparation method of the lead-free two-dimensional double perovskite and an X-ray detector manufactured based on the perovskite. The lead-free two-dimensional double perovskite is applied to X-ray detection. According to the preparation method, histamine dihydrochloride (C5H11Cl2N3Cl), silver chloride (AgCl) and bismuth trioxide (Bi2O3) are mainly used as raw materials, a mixed solution of hydrobromic acid (HBr) and hypophosphorous acid (H2PO2) is used as a solvent, a single crystal material ((C5H9N3) 2AgBiBr8 single crystal) is prepared through a hydrothermal method, and the two sides of the single crystal are coated with silver paste to serve as electrodes, so that the direct type X-ray detector is obtained. The preparation method disclosed by the invention has the characteristics of simplicity, easiness in operation, low requirement on equipment, low cost, low energy consumption and suitability for expanded production.

The invention discloses security inspection equipment, which comprises a ray emitter, a ray receiver and a detection channel, and is characterized in that the detection channel comprises a radiation section, and the ray emitter and the ray receiver are respectively located at two opposite sides of the radiation section; the channel wall defining the radiation section comprises a first wear-resistant layer, a supporting interlayer and a second wear-resistant layer which are arranged in a stacked mode, and detection rays emitted by the ray emitter sequentially penetrate through the first wear-resistant layer, the supporting interlayer and the second wear-resistant layer to enter the radiation section so as to scan an object to be detected; detection rays generated after the object to be detected is scanned sequentially penetrate through the second wear-resistant layer, the supporting interlayer and the first wear-resistant layer and then are received by the ray receiver, and the transmission capacity of the first wear-resistant layer and the second wear-resistant layer to the detection rays is smaller than the transmission capacity of the supporting interlayer to the detection rays. According to the scheme, the problem of poor imaging effect of security inspection equipment in related technologies can be solved.

The invention provides an imaging equipment calibration device and method, imaging equipment and electronic equipment, and relates to the field of imaging equipment calibration. The calibration device of the imaging equipment comprises a deviation analysis module and a calibration module, and the deviation analysis module is used for obtaining a deviation value between a current position and an ideal position of a rotating shaft of the imaging equipment according to at least three celestial body images at different spatial positions; and the calibration module is used for calibrating the imaging equipment based on the deviation value. According to the calibration device of the imaging equipment provided by the embodiment of the invention, the autonomy of equipment calibration can be effectively improved, and for the user side, the calibration process is greatly simplified, and the calibration efficiency, accuracy and reliability are improved.

The embodiment of the invention provides a lens assembly, a camera module and electronic equipment, the lens assembly comprises two lens units, the first lens unit close to the object side is movably arranged so as to realize switching of the lens assembly between a working state and a non-working state, and when the lens assembly is in the working state, the first lens unit is not in contact with the object side. The lens assembly can realize high-quality imaging with a large aperture and a large target surface, and when the lens assembly is switched to a non-working state, the distance between the two lens units can be compressed to reduce the length and the total optical length of the lens assembly, thereby realizing the thinning of the thickness of the lens assembly and the camera module, and improving the imaging quality. In other words, the lens assembly can ensure high imaging quality in a working state and can also be miniaturized in a non-working state. In addition, the two lens units are arranged at a relatively large interval, so that the thinning of the lens assembly and the camera module in a non-working state is more obvious, the ultrathin camera module is obtained, and the thinning requirement of the electronic equipment is better met.

The invention relates to the technical field of automatic focusing, in particular to an optical lens automatic focusing method and system. The method comprises the following steps: scanning a three-dimensional environment on a moving path through an optical lens carried on the sweeping robot, and carrying out waste optical environment analysis to obtain waste optical environment data; performing spatial optical axis offset calculation on the waste optical environment data, and performing focus offset coefficient calculation on the waste optical environment data to obtain a waste focus offset coefficient; performing focal plane curvature change analysis according to the waste focus offset coefficient to obtain focal plane curvature change data; according to the focal plane curvature change data, focal plane multi-dimensional calibration processing is carried out, an optical lens focusing strategy is made, and the optical lens focusing strategy is obtained; and performing automatic firmware design on the optical lens focusing strategy to obtain optical lens focusing strategy firmware. According to the method, the automatic focusing technology is optimized, so that the automatic focusing technology is more perfect.

The invention relates to the technical field of sensing equipment synchronous control, and discloses a camera synchronous triggering system and method and computer equipment. The system comprises a vehicle-mounted upper computer which is used for sending a working mode control instruction to a synchronous trigger box; the positioning device is used for sending a first pulse signal corresponding to the position information to the synchronous trigger box; the laser radar is used for sending a second pulse signal corresponding to the distance information to the synchronous trigger box; the synchronous triggering box is used for determining a target execution strategy corresponding to the target working mode according to the working mode control instruction and a pre-stored corresponding relation between the working mode and the execution strategy; the processor is used for determining a trigger signal according to the target execution strategy so as to control the camera to perform exposure; and the camera is used for receiving the trigger signal to realize exposure control. By implementing the technical scheme of the invention, the highly synchronous control of the exposure opportunity of the camera is realized, and exposure at a specific position and specific time is ensured.

The invention discloses an automatic focusing and distortion optimization method based on a large-target-surface industrial lens, relates to the technical field of lens distortion optimization, and aims to accurately identify different distortion types and provide accurate data for subsequent optimization and adjustment by comprehensively analyzing the distortion of the lens from multiple dimensions (radial, tangential and comet distortion). Through calculation of a comet distortion coefficient HJ obtained by calculating a detailed radial distortion coefficient # imgabs0 #, a first tangential distortion coefficient # imgabs1 # on an x axis and a second tangential distortion coefficient # imgabs2 # on a y axis in combination with S44, various distortion conditions (radial, tangential and comet distortion) of the lens can be quantified, and the total distortion rate D is calculated; the distance between the front focusing group A and the rear fixed lens group B of the lens is evaluated and corrected, and the imaging quality of the lens is improved through step-by-step correction (including focal length, distortion, brightness attenuation and the like) in each step from S2-S5.

The invention relates to preparation and application of a tumor radiotherapy embolism microsphere preparation capable of achieving CT imaging tracing. The microsphere is prepared by taking a polyvinyl alcohol derivative as a framework material, polymerizing, cross-linking and curing the polyvinyl alcohol derivative and an N-(aminoalkyl) methacrylamide hydrochloride monomer, and further covalently connecting a metal chelating agent and a CT imaging agent 2, 3, 5-triiodobenzaldehyde. The microsphere can mark radionuclides 111ln, 68Ga, Al18F, 64Cu, 177Lu and 90Y, embolism treatment and radionuclide internal irradiation treatment are combined, meanwhile, the microsphere CT tracing function is beneficial to monitoring the distribution condition of the microsphere in real time, and ectopic embolism is reduced.