15 results about "Scatter radiation" patented technology

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 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 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.

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.

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.

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 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.

This application discloses a single-source energy spectrum imaging device, relating to the field of medical technology. The method includes a radiation source, a detector assembly, and a grating assembly. Both the detector assembly and the grating assembly are positioned along the emission direction of the radiation source. The detector assembly is used to simultaneously acquire at least two types of radiation image signals during a single exposure of the radiation source, with the at least two types of radiation image signals corresponding to different energy ranges. The grating assembly is located between the radiation source and the detector assembly. The grating assembly includes an enhanced anti-scattering grating with a micro-aperture array for allowing radiation to pass through. The enhanced anti-scattering grating includes a blocking layer and an absorption layer, with the absorption layer compositely disposed on the surface of the blocking layer, absorbing the characteristic radiation generated by the blocking layer. This application solves the technical problem in existing single-source, single-exposure dual-energy imaging where scattered radiation easily contaminates the detector signal, leading to distortion of the energy spectrum data and severe image artifacts.