38results about How to "Expanded imaging field of view" patented technology

The invention relates to a three-dimensional digital imaging method of the large view field cone-beam X-ray tilting scanning of a biased detector, belonging to the technical field of X-ray computerized tomography (CT). In the three-dimensional digital imaging method, the area array detector is placed to be biased, and an X-ray source is used for generating cone-beam X-rays which irradiate a member imaging area with a certain angle in a penetrating and tilting way relative to the length and width surface of a member; in the scanning process, the X-ray source and the area array detector are static, the member rotates in an angle of 360 degrees in an equal angle and step length way surrounding a rotating shaft, and the area array detector acquires an X-ray signal modulated by the member under each rotation angle. A three-dimensional computerized tomography image of a scanning area can be reestablished and obtained by a data truncation smoothing preprocessing method and a filtering back projection reestablishing arithmetic according to data obtained by the area array detector under the scanning angle of 360 degrees. Compared with the traditional tilting scanning method, the three-dimensional digital imaging method can double the tilting scanning imaging view field without changing the system hardware and the scanning speed and has high reestablishment quality, simple process and high efficiency.

The invention discloses a magnetic resonance angiography method. The magnetic resonance angiography method includes applying a flowing sensitive dispersed phase gradient magnetic field in the readout direction and / or the phase encoding direction and / or the layer selection direction in a vasoconstriction period and then applying a residual magnetic moment removing gradient magnetic field after the flowing sensitive dispersed phase gradient magnetic field is applied; collecting blood flow images in the vasoconstriction period; collecting blood flow images in a vasodilatation period; and carrying out subtraction on the blood flow images in the vasoconstriction period and the blood flow images in the vasodilatation period to obtain blood flow images. The invention further discloses a magnetic resonance angiography system. According to the magnetic resonance angiography method and the magnetic resonance angiography system, in the specific implementation method, the flowing sensitive dispersed phase is used in the vasoconstriction period imaging process, so that intra-arterial self-spin dispersed phase can significantly lower arterial blood signals, and therefore the influence on imaging due to the velocity and the direction of blood flow can be reduced, high-quality peripheral arterial images can be obtained, and clinical practicability of the non-enhanced magnetic resonance angiography technology is improved.

The invention discloses an imaging method. The imaging method comprises the following steps: putting an object in a detection region, and biasing a detector; moving an imaging system along a longitudinal Z axis; enabling a ray source and a detector to synchronously move along the periphery of the object, scanning and acquiring data, and performing completion and faultage according to the data. According to the imaging method disclosed by the invention, the detector biasing and spiral trajectory scanning are combined to solve a problem that an image assembly method used by a conventional CT (computed tomography) imaging (particularly cone-beam CT imaging) generates artifact on the assembly image for the cone-beam CT covered by a long Z axis, so that a usage area of the detector is reduced, and the system cost is saved.

The invention discloses a fast fan-beam geometric phase contrast CT imaging device and method. The phase contrast CT imaging device includes an X light source, a phase grating, a sample platform, an analysis grating and a detector. The invention adopts a cylindrical optical element, Large field of view imaging can be realized under the illumination of conventional X light sources; the invention uses cylindrical optical elements that match the geometry of light to avoid the problem of rays being blocked at large incident angles, greatly improving the imaging field of view, and at the same time combining the idea of ​​square projection, In the traditional CT scanning mode, the phase information of the object is successfully extracted, and the fast phase contrast CT imaging is completed.

The invention provides a missing data compensation method, a computed tomography imaging method and system, applied to compensating missing data in a scanning blind area in computed tomography imagingand relates to the technical field of computed tomography (CT) imaging. The computed tomography imaging system comprises an X-ray source and an X-ray detector arranged opposite to each other, whereina center axis of the X-ray detector deviates a preset distance in a moving tangential direction of the X-ray detector relative to an imaging center axis of the computed tomography imaging system so as to obtain an extended detection area. The missing data compensation method comprises the following steps: acquiring reference three-dimensional projection data of a detection object, and weighting the reference three-dimensional projection data so as to compensate the missing three-dimensional projection data, thereby obtaining target three-dimensional projection data of the detection object. According to the missing data compensation method and the computed tomography imaging method and system disclosed by the invention, the detection area of the X-ray detector can be enlarged, so that theCT imaging vision is widened, and data truncation artifact in a reconstructed image can be suppressed; and therefore, the CT imaging quality is improved.

The invention discloses a method and device for mixing cell culture fluid and cell mixed liquid and controlling cell concentration uniformity in mixed liquid. The bottom of a cell fluid mixing tank is fixedly connected with the upside of the center of a horizontally arranged base plate of a vibration table, a circulation hose is connected between the bottom and the top of a cell fluid mixing tank, the circulation hose is provided with a peristaltic pump, the circulation hose between the peristaltic pump and the top of the cell fluid mixing tank is connected with the top of an image acquisition device through a sampling hose, a circular hollow hole penetrated up and down is arranged on the surface of a turntable, close to an edge, in a shell of the image acquisition device, when the turntable is in an initial position, the circular hollow hole is directly below an outlet of the sampling hose, when the turntable rotates a stepping angle counterclockwise and stops, a first sample droplet of the sampling hose is dropped on the upper surface of the turntable, and an image sensor is arranged directly below the first sampling droplet. According to the method and device for mixing the cell culture fluid and the cell mixed liquid and controlling the cell concentration uniformity in the mixed liquid, cells are mixed with a culture solution more fully and the uniformity of the cell mixed liquid can be judged.

The invention discloses an optical projection tomography method based on a merged spiral scanning mode. The optical projection tomography method comprises the following steps of: merging projection drawings on the same height, at the same angle and at different detector positions into a projection drawing which can cover all samples in the horizontal direction, and merging a plurality of local spiral projection data into a whole spiral projection data; calculating the axial visual field of the whole three-dimensional reconstruction body according to the axial position and scanning angle of each merged projection drawing; dividing the three-dimensional reconstruction body into a plurality of pieces of axial tomography to be reconstructed, performing data rearrangement on a projection line corresponding to each axial tomography to be reconstructed to obtain a sinusoidal chart corresponding to the axial tomography to be reconstructed; and reconstructing the sinusoidal chart into a tomography image by utilizing a circular track filtering back projection method, and sequentially superposing various tomography images to obtain the three-dimensional reconstruction body. According to the method, the visual filed of the optical projection tomography can be effectively widened, and the capacity of imaging a large-size object in an imaging system is improved.

The invention discloses an optical projection tomography method based on a helical scanning track. The projection data obtained by an optical projection tomography (OPT) system in a helical scanning manner is rearranged to be transformed to a series of sinusoidal projection images scanned in a circular track, and the sinusoidal projection images are reconstructed, so as to obtain a sample three-dimensional fault structure. The optical projection tomography method provided in the embodiment of the invention can be used for effectively expanding the view of the optical projection tomography, in particular to the imaging view for long and thin objects.

The invention relates to a design method of a high-resolution large-view-field space optical remote sensor. The method comprises the steps of firstly, carrying out optimization design on an optical system by taking the consistency of point spread functions of each view field of a high-resolution large-view-field optical system as an optimization target of the optical system to obtain the optical system of which the point spread functions of each view field are approximately consistent; enabling a clear scenery image to pass through the designed optical system to obtain a uniform and blurred intermediate image in a view field, and improving the image quality of the image in the whole view field through a calculation restoration method. Due to the fact that the design difficulty of the high-resolution large-view-field space optical remote sensor is divided into a hardware implementation part and a software implementation part, the machining and manufacturing difficulty of hardware is lowered, and the design and manufacturing of the optical remote sensor with higher resolution and larger view field can be achieved through an existing machining method. As the consistency of the point spread functions of each view field is adopted as the optimization target of the optical system, the information collection capability of the optical system on an edge view field is improved, the difficulty of image restoration is reduced, and the quality of image restoration is improved.

The invention provides a quantitative myocardial magnetic resonance imaging method and equipment and a storage medium. The method comprises the steps that image signal acquisition operation is performed under the control of an electrocardiograph gating signal and respiratory navigation signal every recovery time period; a parameter T1 is determined according to an acquired image signal and delay time of a saturation pulse corresponding to the image signal, and a parameter T2 is determined according to the acquired image signal, the delay time of the saturation pulse corresponding to the imagesignal and an echo time interval of a T2 preparation pulse; a quantitative myocardial magnetic resonance image is generated according to the parameter T1 and the T2. The quantitative myocardial magnetic resonance imaging method and equipment and the storage medium have the advantages that scanning can be completed under the condition that a testee breathes freely and does not need to suspend breathing; it is allowed that the imaging field is further enlarged and the spatial resolution is increased; in addition, completely stagger and segmental acquisition is performed among sampling points through k-space, thereby achieving the internal registration of an original image, and other image processing in a later stage is not needed.

The invention discloses a monitoring device and a method of radioactive material imaging based on multi-detector, wherein the device comprises: at least two detecting elements comprises at least one imaging or positioning detecting element, and the remaining detecting elements are combinations of one or more counting, imaging or positioning detecting elements, and at least one imaging or positioning detecting element and at least one remaining detecting element are spatially separated from each other; an imaging assembly is connected with each detecting element of multiple detecting elements,the imaging result is obtained according to the imaging information or the positioning information detected by at least one imaging or positioning and detecting element and the counting intensity information or the image information or the positioning information detected by the remaining detecting elements. The device can make the output information of the imaging assembly achieve better imagingor positioning effect, and the imaging field of view is expanded, and the detection sensitivity is improved, image quality or positioning is accuracy.

The invention discloses a grating imaging system and a scanning method thereof. The system comprises a source grating (G0), a first grating (G1) and a second grating (G2) which are sequentially arranged along a light path, at least one of the source grating (G0), the first grating (G1) and the second grating (G2) is a curved surface grating, and an imaging irradiation position is arranged betweenthe first grating (G1) and the second grating (G2). According to the system, the good image quality is kept, the overall scanning time is reduced to the level close to that of a clinical X-ray chest radiography, and meanwhile the radiation dose is well controlled. In conclusion, the large-view grating imaging system has the advantages and characteristics of large imaging view, high scanning speed,low radiation dose and the like.

The invention provides a quantitative myocardium magnetic resonance imaging method, a quantitative myocardium magnetic resonance imaging device and a storage medium. The method comprises the followingsteps: under the control of an electrocardio gate control signal and a breathing navigation signal, carrying out image signal collecting operation at every other recovery time period; determining a parameter T1 according to the collected image signal and the delay time of saturation pulse corresponding to the collected image signal, and determining a parameter T2 according to the collected imagesignal, the delay time of saturation pulse corresponding to the collected image signal, and the echo time interval of T2 priming pulse; and generating a quantitative myocardium magnetic resonance image according to the parameter T1 and the parameter T2. According to the technical scheme, scanning can be carried out under the condition that a tested person has free breathing, and breath holding isnot needed. Meanwhile, the imaging visual field can be further expanded, and thus the spatial resolution is improved. In addition, through k-space, complete staggered sectional collection among the sampling points is realized, thus the inherent registering of original images is realized, and the additional image processing at the later period is not needed.

The invention discloses a grating imaging system, wherein the system comprises: a source grating (G0) for converting incoherent light emitted by a light source into coherent light; a first grating (G1) formed by splicing a plurality of first grating units and used for obtaining first imaging after the coherent light passes through the first grating (G1); and a second grating (G2) formed by splicing a plurality of second grating units and used for operating the first imaging to obtain second imaging, wherein an imaging irradiation site is arranged between the first grating (G1) and the second grating (G2), and the source grating (G0), the first grating (G1) and the second grating (G2) form an optical path to form the system. The system allows the whole scanning time to be reduced to a levelclose to that of a clinical X-ray chest film while good image quality is maintained, and the radiation dose is well controlled; in summary, the large-field grating imaging system has the advantages of large imaging field, high scanning speed, low radiation dose and the like.

The invention discloses an X-ray imaging device and a detector deflection mechanism thereof. The detector deflection mechanism comprises a substrate, a rotation motor, a revolving bed, a detector mounting board used to mount a detector, and an offset guide rod. The substrate is provided with an offset guide groove. The rotation motor is arranged on the substrate. The revolving bed and the rotationmotor are connected in a transmission manner, and rotation of the revolving bed is driven by the rotation motor. The detector mounting board is moveably arranged on the revolving bed. The offset guide rod is connected with the detector mounting board, and is moveably cooperated in the offset guide groove along the offset guide groove. When the revolving bed rotates driven by the rotation motor, the detector mounting board is driven to rotate, and the detector mounting board moves relative to the revolving bed under the action of the offset guide rod which moves along the offset guide groove.The detector deflection mechanism of the X-ray imaging device can expand imaging view, and cost is relatively low.

The invention relates to a three-dimensional digital imaging method of the large view field cone-beam X-ray tilting scanning of a biased detector, belonging to the technical field of X-ray computerized tomography (CT). In the three-dimensional digital imaging method, the area array detector is placed to be biased, and an X-ray source is used for generating cone-beam X-rays which irradiate a member imaging area with a certain angle in a penetrating and tilting way relative to the length and width surface of a member; in the scanning process, the X-ray source and the area array detector are static, the member rotates in an angle of 360 degrees in an equal angle and step length way surrounding a rotating shaft, and the area array detector acquires an X-ray signal modulated by the member under each rotation angle. A three-dimensional computerized tomography image of a scanning area can be reestablished and obtained by a data truncation smoothing preprocessing method and a filtering back projection reestablishing arithmetic according to data obtained by the area array detector under the scanning angle of 360 degrees. Compared with the traditional tilting scanning method, the three-dimensional digital imaging method can double the tilting scanning imaging view field without changing the system hardware and the scanning speed and has high reestablishment quality, simple process and high efficiency.

The invention discloses a grating imaging system and a scanning method thereof. The system includes a source grating (G0), a first grating (G1) and a second grating (G2) arranged in sequence along an optical path, wherein: the source grating (G0), the second grating At least one of the first grating (G1) and the second grating (G2) is a curved grating, and an imaging irradiation position is set between the first grating (G1) and the second grating (G2). While maintaining good image quality, the overall scanning time is reduced to a level close to that of clinical X-ray chest films, and the radiation dose is well controlled; in general, the large-field raster imaging system has a large imaging field of view. , fast scanning speed, low radiation dose and other advantages and characteristics.

The invention discloses an optical projection tomography method based on a merged spiral scanning mode. The optical projection tomography method comprises the following steps of: merging projection drawings on the same height, at the same angle and at different detector positions into a projection drawing which can cover all samples in the horizontal direction, and merging a plurality of local spiral projection data into a whole spiral projection data; calculating the axial visual field of the whole three-dimensional reconstruction body according to the axial position and scanning angle of each merged projection drawing; dividing the three-dimensional reconstruction body into a plurality of pieces of axial tomography to be reconstructed, performing data rearrangement on a projection line corresponding to each axial tomography to be reconstructed to obtain a sinusoidal chart corresponding to the axial tomography to be reconstructed; and reconstructing the sinusoidal chart into a tomography image by utilizing a circular track filtering back projection method, and sequentially superposing various tomography images to obtain the three-dimensional reconstruction body. According to the method, the visual filed of the optical projection tomography can be effectively widened, and the capacity of imaging a large-size object in an imaging system is improved.

The invention discloses a method and device for mixing cell culture fluid and cell mixed liquid and controlling cell concentration uniformity in mixed liquid. The bottom of a cell fluid mixing tank is fixedly connected with the upside of the center of a horizontally arranged base plate of a vibration table, a circulation hose is connected between the bottom and the top of a cell fluid mixing tank, the circulation hose is provided with a peristaltic pump, the circulation hose between the peristaltic pump and the top of the cell fluid mixing tank is connected with the top of an image acquisition device through a sampling hose, a circular hollow hole penetrated up and down is arranged on the surface of a turntable, close to an edge, in a shell of the image acquisition device, when the turntable is in an initial position, the circular hollow hole is directly below an outlet of the sampling hose, when the turntable rotates a stepping angle counterclockwise and stops, a first sample droplet of the sampling hose is dropped on the upper surface of the turntable, and an image sensor is arranged directly below the first sampling droplet. According to the method and device for mixing the cell culture fluid and the cell mixed liquid and controlling the cell concentration uniformity in the mixed liquid, cells are mixed with a culture solution more fully and the uniformity of the cell mixed liquid can be judged.

The invention provides a myocardial quantitative magnetic resonance imaging method, equipment and storage medium. The method includes: performing an image signal acquisition operation under the control of the ECG gating signal and the respiratory navigation signal at intervals of the recovery period; determining the parameter T according to the acquired image signal and the delay time of the corresponding saturation pulse 1 ;according to the parameter T 1 Generate myocardial quantitative magnetic resonance images. This protocol allows the scan to be completed with the subject breathing freely, without the need for breath-holding. At the same time, it also allows to further expand the imaging field of view and improve the spatial resolution. In addition, segmented acquisitions are fully interleaved between sampling points via k‑space, enabling intrinsic registration of the original image without additional image processing in post.

The invention discloses an optical projection tomography method based on a helical scanning track. The projection data obtained by an optical projection tomography (OPT) system in a helical scanning manner is rearranged to be transformed to a series of sinusoidal projection images scanned in a circular track, and the sinusoidal projection images are reconstructed, so as to obtain a sample three-dimensional fault structure. The optical projection tomography method provided in the embodiment of the invention can be used for effectively expanding the view of the optical projection tomography, in particular to the imaging view for long and thin objects.

The invention discloses a large-view radioactive source positioning system and method. The system comprises a main gamma imaging detector, a plurality of side gamma imaging detectors, a plurality of side shielding layers and a collimator, wherein the plurality of side shielding layers surround the main gamma imaging detector to form a cylindrical shielding structure, the collimator and the main gamma imaging detector are located at the two ends of the cylindrical shielding structure respectively, the side gamma imaging detector is adjacent to the main gamma imaging detector and is arranged on the inner side wall of the cylindrical shielding structure, and each detector is used for capturing incident information of gamma rays entering the positioning system through the collimator in different view fields and carrying out imaging and image reconstruction, so that the position information of the radioactive source is obtained through the reconstructed image. According to the scheme, the visual field of the detection system is enlarged, and blind search can be reduced in radioactive source positioning; and the size of the system can be controlled, and carrying and using are convenient.

The invention discloses an optical grating imaging system. The system includes a source optical grating (G0), a first optical grating (G1) and a second optical grating (G2) arranged in sequence alongan optical path, wherein the first optical grating (G1) includes a plurality of first optical grating units spliced with one another in a dislocation manner, and / or the second optical grating (G2) includes a plurality of second optical grating units spliced with one another in a dislocation manner. A large-area optical grating formed by dislocation splicing can complete imaging by only one scanning in the actual scanning imaging process, the scanning speed is faster, and the scanning efficiency is further improved; and the large-view field optical grating imaging system has the advantages andcharacteristics of a large imaging field of view, a fast scanning speed and a low radiation dose.

The invention discloses an X-ray imaging device and a detector deflection mechanism thereof. The detector deflection mechanism comprises a substrate, a rotation motor, a revolving bed, a detector mounting board used to mount a detector, and an offset guide rod. The substrate is provided with an offset guide groove. The rotation motor is arranged on the substrate. The revolving bed and the rotationmotor are connected in a transmission manner, and rotation of the revolving bed is driven by the rotation motor. The detector mounting board is moveably arranged on the revolving bed. The offset guide rod is connected with the detector mounting board, and is moveably cooperated in the offset guide groove along the offset guide groove. When the revolving bed rotates driven by the rotation motor, the detector mounting board is driven to rotate, and the detector mounting board moves relative to the revolving bed under the action of the offset guide rod which moves along the offset guide groove.The detector deflection mechanism of the X-ray imaging device can expand imaging view, and cost is relatively low.

The invention relates to an airborne ultra-wide-angle spherical reflective optical system, which sequentially includes: window glass, a first spherical reflector, a second spherical reflector, a third spherical reflector, and a fourth spherical reflector along the direction of light beam propagation. mirror, folding mirror and focal plane CMOS detector; wherein, the coordinate system where the window glass is located is the global coordinate system, the direction of the Z axis is vertically upward, the direction of the Y axis is in the paper, and the direction is to the left and perpendicular to the Z axis, and the X axis The right-hand rule is satisfied with the Y-axis and Z-axis. The airborne ultra-wide-angle spherical reflective optical system of the present invention is applied to the airborne optical imaging system, the field of view angle reaches 90°, and the spatial resolution of the earth observation can reach 0.2m, which greatly improves the imaging field of view and effectively expands the The ground coverage width and ground observation accuracy have greatly improved the efficiency of earth observation.

The invention provides a large-view-field light sheet microscopic imaging system and method based on multi-slit interference illumination. The large-view-field light sheet microscopic imaging system comprises a Gaussian beam generation module used for generating Gaussian beams; a non-diffraction-like Bessel light sheet generation module which is used for receiving the Gaussian beam, converting the Gaussian beam into a non-diffraction-like Bessel light sheet of which the focal depth range is larger than the Rayleigh distance of the Gaussian beam, projecting the non-diffraction-like Bessel light sheet onto a sample surface and exciting the sample to generate a fluorescence signal; and a detector which is used for collecting fluorescence signals to obtain the image information of the sample. The system is advantaged in that the Gaussian beam is converted into the non-diffraction-like Bessel light sheet with the focal depth range larger than the Rayleigh distance of the Gaussian beam through the non-diffraction-like Bessel light sheet generation module, a sample is excited through the non-diffraction-like Bessel light sheet to generate a fluorescence signal, thickness of an illumination light sheet can be reduced, the focal depth of the illumination light sheet is increased, a side lobe of a Bessel beam is eliminated, background noise is reduced, and the imaging view field and the resolution are both improved.

The invention relates to a visual detection method for an inner wall structure of an annular body. A used detection system comprises a camera, a computer and a conical-surface reflector, the conical-surface reflector and the camera are positioned at the two sides of the inner wall of the annular body and just face the camera, and an image formed by the conical surface reflector of the inner wall of the annular body is collected by the camera. The detection method comprises that lower and upper boundaries of the inner wall are positioned by edge extraction and oval fitting, and position withinthe boundaries is an image position corresponding to the inner wall of the annular body; a polar coordinate system is established according to the identified image position, the polar radius and polarangle corresponding to the height and azimuth of the inner wall of the original annular body; and correspondence between the polar radius and the practical inner wall height is obtained by calibration; the inner wall structure of the annular body is identified by means of feature extraction, and position information of the inner wall structure is calculated according to a calibration result before; and whether the inner wall structure is qualified is determined.

An imaging method, the object is placed in the detection area, and the detector is biased, and then the imaging system is moved along the longitudinal Z-axis, the ray source and the detector synchronously move around the object in a circular motion, scan and collect data, and Complement the fault based on the data. The imaging method of the present invention adopts the combination of detector bias and helical trajectory scanning to solve the image stitching method used in traditional CT imaging (especially cone beam CT imaging) to image at the stitching place of cone beam CT covered by the long Z axis The problem of artifacts is generated, and the area used by the detector is reduced to save system cost.