34 results about "Scatter radiation" patented technology

A method for determining a scatter correction for an x-ray radiation signal recorded by an x-ray detector (2) of an imaging modality based on x-ray radiation, the method comprising the following method steps: (a) receiving inside radiation data and outside scattered radiation data, wherein the inside radiation data is data obtained from a directly illuminated partial area (21) of the x-ray detector (2) with a primary x-ray beam (11) directed at an object within an examination area (3), wherein the outside scattered radiation data is data obtained by detecting scattered radiation (12) outside of the directly illuminated partial area (21); (b) based on the outside scattered radiation data, determining a scatter correction, in particular by estimating a part of the inside radiation data that is due to the scattered radiation (12).

A system configured to reduce scatter radiation around a surgical table during a medical procedure that may include at least one radiation shield configured to be connected to a surgical table with an attachment mechanism, wherein the at least one radiation shield includes one or more adjustable radiation shield segments coupled or releasably coupled to the at least one radiation shield. A device may include a pump in fluid communication with the one or more adjustable radiation shield segments comprising a pneumatic channel that is configured to at least partially inflate the pneumatic channel such that at least a first portion of the at least one radiation shield extends vertically above at least a portion of the surgical table, wherein a second portion of radiation shield is configured to extend below the surgical table. A device may include a controller configured to activate the pump.

A shielding system for reducing scatter radiation during x-ray imaging procedures may include a drawer feature to temporarily move a shield portion laterally outward from a medical procedure table. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a curtain feature to temporarily move a shield portion to enable a range of positioning of an x-ray source around a medical procedure table; in some embodiments, the shield portion may include wound wire stays to flexibly and / or temporarily conform to movement of equipment near the medical procedure table. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a rail extension feature to enable mounting or flexible positioning of components near a medical procedure table; in some aspects, the rail extension may include an undercut region that facilitates placement of jam boards and the like under a patient during a procedure. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a telescoping hip shield feature configured to releasably couple to a rail of a medical procedure table and to extend and retract longitudinally to vary the positioning of the telescoping shield. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a head protection feature configured to pivot a shield portion about two or more axes relative to a medical procedure table.

A system configured to reduce scatter radiation around a surgical table during a medical procedure that may include at least one radiation shield configured to be connected to a surgical table with an attachment mechanism, wherein the at least one radiation shield includes one or more adjustable radiation shield segments coupled or releasably coupled to the at least one radiation shield. A device may include a pump in fluid communication with the one or more adjustable radiation shield segments comprising a pneumatic channel that is configured to at least partially inflate the pneumatic channel such that at least a first portion of the at least one radiation shield extends vertically above at least a portion of the surgical table, wherein a second portion of radiation shield is configured to extend below the surgical table. A device may include a controller configured to activate the pump.

The invention relates to a method for training a machine learning algorithm to correct an image obtained by means of an imaging device. A plurality of initial images (10) are recorded. In addition, a smaller number of first high-quality scattered radiation images (14 ') are simulated from the initial image. Furthermore, a corresponding number of second low-mass scattered radiation images (13 ') are simulated, the simulation being performed by reducing the number of photons by at least one order of magnitude. The algorithm is trained using the second low-quality scattered radiation image (13 ') as input data and the first high-quality scattered radiation image (14') as output data.

A method for identifying a defect within a cement layer of a multi string wellbore includes deploying a gamma scanner into the multistring wellbore, the gamma scanner including at least one source and at least one detector, the at least one source emitting radiation into the multistring wellbore and the at least one detector receiving backscatter radiation. The method also includes obtaining, from the gamma scanner, a count rate associated with at least one region of interest of the multistring wellbore. The method further includes identifying, based at least in part on data acquired from the gamma scanner, a background profile for the multistring wellbore. The method includes removing the background profile from the count rate. The method further includes identifying, within the at least one region of interest, a defect within the cement layer.

This invention belongs to the field of optoelectronic information acquisition and processing, and provides a method for identifying similar but different targets at room temperature based on multi-band spectral extreme value characteristics. Starting from the fundamental infrared physics knowledge that targets scatter / radiate differently, it utilizes the material, scattering, and radiation characteristics of true and false targets in different bands, i.e., identifying the extreme points (absorption peaks) corresponding to different bands, to distinguish between true and false targets. Since targets exhibit different characteristics in different bands, the number of absorption peaks also differs. Short-wave bands primarily reflect the target's scattering characteristics, while medium and long-wave bands reflect its radiation characteristics. Therefore, when statistically analyzing spectral extreme points, the bands are divided into short-wave, medium-wave, and long-wave bands, and adjacent extreme spectral points of scattering and radiation differ between true and false targets. This invention uses a single-band discrimination formula to sequentially determine the number and amplitude of extreme points in the short-wave, medium-wave, and long-wave bands for true and false targets until a true target is found. If a true target cannot be identified in any of the three bands, the target is considered a false target.

An apparatus comprising: an emitter configured to emit X-ray radiation incident upon a target; a detector configured to detect backscattered radiation from the target; and a computer, comprising a processor and a memory, communicatively coupled to the detector, wherein the computer is configured to classify a composition of the target based on the detected backscattered radiation.

A method for determining the pose of a calibration element located in an irradiation area of ​​an additive manufacturing device is disclosed. The device is configured for the production of three-dimensional workpieces by selectively irradiating a raw material layer by layer. An irradiation beam is scanned along predefined scan paths across the calibration element, each scan path having two intersections with scattering features of the calibration element. For each scan path, a time-dependent intensity of the radiation scattered by the calibration element is recorded. The intensities are analyzed to identify intensity peaks. The pose of the calibration element is determined at which the identified intensity peaks coincide with the intersections between the scan paths and the scattering features. A system is also disclosed herein.

A system includes a radiation source that generates radiation having at least one wavelength from 0.1 to 100 nm. One or more rotating elements change polarization of the radiation and / or relative phase between two polarizations of the radiation. A stage is configured to hold a workpiece in a path of the radiation. At least one detector receives spectral reflection and scattering radiation from the workpiece.

At least one pulsed incident beam of light is directed toward a portion of the brain of a patient. At least one backscattered beam of light from the portion of the patient's brain is received and an insertion loss, IL, is calculated asIL=20⁢ log⁢AB⁢SAI,where ABS is an amplitude of the at least one backscattered beam of light, and where AI is an amplitude of the at least one pulsed incident beam of light. An insertion phase difference, IPD, is calculated as IPD=ϕBS−ϕI, where ϕBS is a phase of the at least one backscattered beam of light, and where ϕI, is a phase of the at least one pulsed incident beam of light. It is then determined if the patient has a brain abnormality based on the calculated insertion loss and the insertion phase difference.

The invention relates to a scattered radiation mask for reducing X-ray scattered radiation, in particular for X-ray imaging, comprising a layer stack having a first X-ray transparent layer, a second X-ray absorbing layer and a third X-ray transparent layer, wherein the first layer, the second layer and the third layer each have at least one planar sub-layer, and adjacent sub-layers of the layer stack are coated one above the other in the stacking direction by means of an additive manufacturing method. The invention also relates to a device for X-ray imaging, a method for producing a scattered radiation mask, a facility for additive production of a scattered radiation mask, and the use of a facility with a coating unit for additive production of a scattered radiation mask.

A shielding system for reducing scatter radiation during x-ray imaging procedures may include a drawer feature to temporarily move a shield portion laterally outward from a medical procedure table. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a curtain feature to temporarily move a shield portion to enable a range of positioning of an x-ray source around a medical procedure table; in some embodiments, the shield portion may include wound wire stays to flexibly and / or temporarily conform to movement of equipment near the medical procedure table. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a rail extension feature to enable mounting or flexible positioning of components near a medical procedure table; in some aspects, the rail extension may include an undercut region that facilitates placement of jam boards and the like under a patient during a procedure. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a telescoping hip shield feature configured to releasably couple to a rail of a medical procedure table and to extend and retract longitudinally to vary the positioning of the telescoping shield. A shielding system for reducing scatter radiation during x-ray imaging procedures may include a head protection feature configured to pivot a shield portion about two or more axes relative to a medical procedure table.

Radio-frequency identification (RFID) systems use readers to query and locate passive RFID tags in stores, warehouses, and other environments. An interrogation signal emitted by an antenna array from a reader powers up the tag, which replies by modulating and backscattering incident radiation toward the reader. The antenna array in the reader detects the modulated and backscattered radiation, which is usually several of orders of magnitude weaker than the interrogation signal, as the tag's reply. Unfortunately, crosstalk between the antenna elements in the antenna array limits the reader's sensitivity, which in turn limits the range at which the reader can detect and locate tags. Increasing the pitch of the antenna array to greater than half the wavelength of the interrogation signal reduces crosstalk but introduces grating lobes that produce spurious replies. Fortunately, filtering these spurious replies yields sensitive measurements from an antenna array with a pitch large enough to suppress crosstalk.

An antenna assembly, such as a RADAR sensor antenna assembly, incorporating destructive interference elements. In some embodiments, the assembly may include one or more waveguides, one or more antenna slots, and a plurality of destructive interference elements. The destructive interference element may be configured to reduce backscattered radiation by promoting destructive interference of electromagnetic waves incident on the destructive interference element. In some embodiments, the destructive interference element may be defined and / or exposed by a plate, which may be coupled with a waveguide block or another layer / component of the assembly.

A method for identifying a defect within a cement layer of a multistring wellbore includes deploying a gamma scanner into the multistring wellbore (702), the gamma scanner including at least one sourc

A system (10) for detecting brain abnormalities in a brain of a patient includes a headband (15) configured to be worn on a head of a patient. The headband (15) includes at least one light source (75) configured to generate at least one pulsed incident beam of light (IBNIR) directed toward a portion of the brain (45) of the patient and at least one detector (80) configured to detect at least one backscattered beam of light (BSBNIR) from the portion of the brain (45) of the patient. The headband (15) further includes a controller (90) configured to calculate an insertion loss (IL) and an insertion phase difference (I PD ). It is then determined if the patient has a brain abnormality based on the calculated insertion loss (IL) and the insertion phase difference (I PD ).

A method for identifying a defect within a cement layer of a multistring wellbore includes deploying a gamma scanner into the multistring wellbore, the gamma scanner including at least one source and at least one detector, the at least one source emitting radiation into the multistring wellbore and the at least one detector receiving backscatter radiation. The method also includes obtaining, from the gamma scanner, a count rate associated with at least one region of interest of the multistring wellbore. The method further includes identifying, based at least in part on data acquired from the gamma scanner, a background profile for the multistring wellbore. The method includes removing the background profile from the count rate. The method further includes identifying, within the at least one region of interest, a defect within the cement layer.

A system includes a radiation source that generates radiation having at least one wavelength from 0.1 to 100 nm. One or more rotating elements change polarization of the radiation and / or relative phase between two polarizations of the radiation. A stage is configured to hold a workpiece in a path of the radiation. At least one detector receives spectral reflection and scattering radiation from the workpiece.

The invention discloses a building global sunshine analysis method based on a live-action three-dimensional model, and the method comprises the steps: calculating a sunshine vector according to a time window, the number of analysis days, a moment list and the latitude and longitude of a location, and carrying out the loading, normal vector correction, roof recognition and adaptive subdivision of a building model. And for the subdivided building model, constructing a ray parallel to the sunlight direction by taking the center point of the surface as a starting point, judging whether the surface is shielded or not through ray-grid intersection detection, and calculating the sunshine duration of the triangular surface. And further calculating direct radiation, scattered radiation and ground reflection radiation of the surface, and estimating the total irradiance of the triangular surface. And calculating a mean value of all results on the time sequence to obtain a comprehensive sunlight analysis result. And matching an analysis result with a model surface index, exporting a data table, and embedding a surface patch color into a model for storage.

In some examples, a backscatter detection system configured to be mounted on a vehicle is disclosed, comprising: an ionizing radiation source to illuminate a cargo for inspection; at least one detector for detecting radiation backscattered by the inspected cargo; and a housing configured to accommodate the source and the at least one detector, where the backscatter detection system is configured to be movable between inspection sites at which cargo inspection is performed, where the backscatter detection system is configured to operate in at least two modes, including: an inspection mode in which the backscatter detection system is configured to be movable between inspection sites at which cargo inspection is performed; wherein the backscatter detection system is configured to operate to inspect the cargo at an inspection site; and a transport mode wherein the backscatter detection system is configured to transport between inspection sites wherein the backscatter detection system is further configured such that, in the inspection mode, the housing is open, and, in the inspection mode, the housing is closed. Such that at least one of the ionizing radiation and the backscattered radiation does not substantially encounter the housing in a region of the system facing the cargo.

The utility model discloses an application device for anti-scattering ray flexible shielding material, which comprises a base, an application table, a swing rod, a swing rod, a rolling shaft and the like, the swing rod is driven to move through the movement of the swing rod, so that the rolling shaft moves horizontally and generates downward pressing force, and the application table is fixed on the base. According to the application device, the anti-scattering ray flexible shielding material layer structures can be tightly attached, bubbles and wrinkles in the anti-scattering ray flexible shielding material are reduced, and the defect that in the prior art, the application device does not attach to the anti-scattering ray flexible shielding material is overcome; the hinged position of the swing rod and the rocking rod is located at the middle point in the length direction of the rocking rod, and when the rocking rod swings, force can be evenly transmitted to the swing rod, so that movement of the swing rod is more stable and controllable, it is guaranteed that pressure applied by the rolling shaft to the anti-scattering ray flexible shielding material is distributed more evenly, and the service life of the rolling shaft is prolonged. And the situation that the local pressure of the material is too large or too small due to non-uniform force transmission, and the application quality is affected is avoided.

Radio-frequency identification (RFID) systems use readers to query and locate passive RFID tags in stores, warehouses, and other environments. An interrogation signal emitted by an antenna array from a reader powers up the tag, which replies by modulating and backscattering incident radiation toward the reader. The antenna array in the reader detects the modulated and backscattered radiation, which is usually several of orders of magnitude weaker than the interrogation signal, as the tag's reply. Unfortunately, crosstalk between the antenna elements in the antenna array limits the reader's sensitivity, which in turn limits the range at which the reader can detect and locate tags. Increasing the pitch of the antenna array to greater than half the wavelength of the interrogation signal reduces crosstalk but introduces grating lobes that produce spurious replies. Fortunately, filtering these spurious replies yields sensitive measurements from an antenna array with a pitch large enough to suppress crosstalk.

Computer-implemented method for determining an estimate (1) of a two-dimensional scatter radiation distribution in a two-dimensional X-ray image (2) based on imaging by an X-ray detector (3), comprising the steps: - Receiving the X-ray image (1), - Applying an estimation algorithm (4) to the X-ray image (1) or to a two-dimensional intermediate image (5) determined from the X-ray image (1), wherein the estimation algorithm (4) determines a respective two-dimensional partial scattered radiation image (6-8) for several physical scattering processes such that image values ​​of image points of the respective partial scattered radiation image (6-8) each describe an estimated value for a respective scattered radiation dose which was irradiated onto a respective detector area (9) of the X-ray detector (3) associated with the respective image point during the acquisition of the X-ray image (1) by the respective physical scattering process, - Determining the estimation (1) of the scatter radiation distribution based on the multiple partial scatter radiation images (6-8).

A scatter radiation protection device is provided. The scatter radiation protection device includes a barrier that is movable in an x-direction, a y-direction, and a z direction; a skirt that is movable in an x-direction; and a sliding track having an upper surface and a lower surface. The barrier and the skirt are configured for connection to the sliding track, and the barrier and the skirt provide for at least 0.5 millimeters of lead (mmPb) equivalence.

The present invention relates to a system and method for non-contact measurement of the temperature of a portion (3') of an object (3) coated with a layer of a luminophor material from the zinc oxide family. By means of a light source (1) emitting in a wavelength range at least partially covering a range between 360 and 480 nm and means for measuring a light intensity as a function of the wavelength (5) covering at least part of the range of the light source (1), a light intensity is measured as a function of the wavelength of radiation scattered by the portion of the object. Then, from the measurement of the light intensity as a function of the wavelength, a value of at least one parameter is determined, and the temperature of the portion (3') of the object (3) is determined from the value of the parameter and a predetermined correspondence table. Figure 2 to be published

A system (10) for determining a refractive index of a sample fluid or a concentration of a component in the sample fluid comprises a transparent sensing element (12) with a plurality of pores (122) for receiving a fluid. The pores reflect or scatter radiation emitted by a radiation emitter (14) of the system differently depending on the refractive index of the fluid. The system comprises one or more detectors (16) for detecting the reflected and / or scattered radiation. The refractive index of the sample fluid is determined based on the detected scattered and / or reflected radiation when the sample fluid is fed into the pores, the corresponding detected scattered and / or reflected radiation when first and second calibration fluids having predetermined refractive indexes and predetermined absorptions at at least two wavelengths are fed into the pores, said predetermined refractive indexes and said predetermined absorptions. Alternatively, a concentration of a component in the sample fluid absorbing at a given wavelength may be determined based on the detected scattered and / or reflected radiation, a predetermined refractive index of the sample fluid, a predetermined refractive index and a predetermined absorption at said wavelength of a calibration fluid, and the detected scattered and / or reflected radiation when the calibration fluid is fed into the pores.

The invention relates to a computer-implemented method for determining individual scatter radiation images for X-ray image points to be considered in an X-ray image, comprising the steps: - Obtaining an X-ray image, wherein the X-ray image is captured using an X-ray detector and comprises a plurality of X-ray image points, each of which is assigned to a detector area of ​​the X-ray detector, where several or all of the X-ray image points are X-ray image points to be considered; - Providing an estimation algorithm which, based on the X-ray image, determines a single scatter radiation image assigned to each of the X-ray image points to be considered, wherein each individual scatter radiation image has a multitude of scatter radiation image points, each of which is assigned to a detector area of ​​the X-ray detector, where the image values ​​of the scattered radiation image points of the single scattered radiation image correlate with the intensity of the scattered radiation which, starting from the primary radiation incident on a detector area assigned to the respective X-ray image point to be considered, is scattered onto the detector area assigned to the respective scattered radiation image point; - Determining an individual scatter radiation image for each of the X-ray image points to be considered by applying the estimation algorithm to the X-ray image.

This application provides a radiotherapy device, comprising a radiation source, a treatment bed, and a shielding chamber. A treatment cavity is formed within the radiation source, and one end of the radiation source has an opening for the treatment bed to enter and exit the treatment cavity. The end of the treatment cavity opposite the opening is closed. The shielding chamber is disposed around the periphery of the radiotherapy device to shield the radiation generated by the device. By placing the shielding chamber around the radiotherapy device, this application at least partially shields the scattered radiation generated within the device. Therefore, it reduces the radiation shielding requirements of a dedicated treatment room or eliminates the reliance on a dedicated treatment room for radiotherapy equipment.

A flexible radiation shielding system for reducing scatter radiation that may arise during the performance of certain medical imaging procedures. A multi-articulated shielding system comprising two or more shielding elements hingedly coupled to each other to thereby enable a user to bend the shielding system into a desired shape to provide radiation shielding protection to workers. A flexible radiation shielding system may comprise a plurality of shielding elements that are, for example, translucent, transparent, clear, etc., to enable workers to view objects through the shielding elements.