16results about "Photographic dosimeters" patented technology

An embodiment of the invention relates to a method for estimating a dose rate based on measurements performed by a gamma camera (2), the gamma camera defining an observation field (Ω), the estimated dose rate originating from a radiation source (10 a , 10 b ), these radiation sources emit ionizing electromagnetic radiation; the observation field is discretized into a grid; the gamma camera (2) includes pixels (2 j ), each pixel being configured to detect ionizing electromagnetic radiation during an acquisition time and thereby forming an energy spectrum, each pixel being associated with at least one point of a grid, said pixels together allowing to obtain the position of a radiation source in an energy band or in a plurality of energy bands in the observation field; the method comprising estimating a dose rate produced on a gamma camera by a point of the grid.

The application discloses a kind of based on coding aperture technology and laser radar's radioactive source quantification imaging method, its steps include: 1) using coding aperture gamma camera obtains the coding projection and energy spectrum of radioactive source in target area, and decoding calculation is carried out to coding projection to obtain coding reconstruction image O;2) obtaining the radiation hot spot in image O, generates radiation hot spot image;3) according to energy spectrum, the full energy peak E of radioactive source is identified, and the dose rate at the position where camera is calculated;4) by laser radar, the three-dimensional point cloud information of the target area is acquired, and the optical video information of target area is acquired by optical camera;Then according to azimuth, the pixels in radiation hot spot image, optical video information, three-dimensional point cloud information are matched and fused;5) find the three-dimensional point cloud pixel corresponding to radiation hot spot in fusion map;According to the three-dimensional point cloud pixel corresponding to radiation hot spot, the distance between radiation source and camera is obtained;6) inversion calculation obtains the activity value of radioactive source.

A radiation dosimetry apparatus comprises a body that supports scintillator elements that emit light when exposed to radiation. The body may be shaped to conform to contours of a portion of a patient's anatomy. Radiation intensity and dose may be determined by processing images obtained by one or more cameras to measure intensity of light emitted by different ones of the scintillator elements. The scintillator elements may be distributed non-uniformly based on a patient-specific radiation treatment plan. Scintillator elements may be arranged to provide increased spatial resolution and / or dose resolution in higher dose regions and / or regions corresponding to organs at risk. Radiation dosimeter apparatuses may be fabricated by additive manufacturing. Design and fabrication of the radiation dosimetry apparatuses may be integrated into workflows in clinical radiation treatment settings. Methods and systems for fabricating, calibrating, and using the radiation dosimetry apparatuses are described.

A method for correcting an X-ray image that is based on imaging during a first time interval and indicates a respective X-ray image value for at least one image point includes receiving a plurality of dark images. A respective dark image is based on image data capturing during a respective subinterval of a second time interval preceding the first time interval, during which no X-rays are irradiated onto an X-ray detector, and indicates a respective dark image value for the respective image point. A respective afterglow value is predicted for the respective image point in the X-ray image, in dependence on the dark image values of a plurality of the dark images for the respective image point. The X-ray image is corrected by ascertaining a respective corrected X-ray image value for the respective image point in dependence on the respective X-ray image value and the respective afterglow value.

An imaging system is used for capturing images of a subject during X-ray examination. It comprises a video camera system, separate to the X-ray image generation, for generating video camera images. The video camera images are processed to determine that a captured video camera image is synchronized with an X-ray exposure, based on saturation of one or more pixels of the captured video camera image. Timing information can then be generated associating the timing of the video camera images with the timing of the X-ray exposure.

The invention provides a method and system for treating tumors by tracing and monitoring protons and heavy ions on line, and belongs to the technical field of radiation tumor treatment.The method comprises the steps that a proton beam or a heavy ion beam is controlled to irradiate a tumor target area of a patient; acquiring signal intensity and spatial distribution information of characteristic X-rays emitted from the body of the patient; acquiring a real-time Bragg peak dose deposition distribution image of the proton beam or the heavy ion beam in the tumor target area according to the signal intensity and the spatial distribution information; acquiring a position deviation and a dose deviation according to the real-time image and a preset treatment plan image; and dynamically adjusting beam parameters of the subsequently emitted proton beam or heavy ion beam according to the position deviation and the dose deviation. According to the invention, by detecting the characteristic signal generated in the treatment process in real time, visualization and closed-loop control of in-vivo dose deposition are realized.

The utility model relates to the technical field of medical protection appliances, in particular to a lead protection neck collar helpful for monitoring external irradiation dose, which comprises a neck collar main body, the neck collar main body comprises a neck collar part and a collar part, the collar part is fixedly connected to the lower end of the neck collar part, and the neck collar part is fixedly connected to the neck collar part. A first reinforcing area matched with the outer contour of the collar part is arranged on the outer surface of the collar part, a neck sleeve is detachably installed on the outer surface of the neck part, and dosimeter hanging bodies are arranged on the left side and the right side of the outer surface of the collar part. According to the lead protection neck collar beneficial to monitoring the external irradiation dose, due to the arrangement of the dosimeter hanging main body, a user can conveniently and accurately wear a dosimeter, a proper fixing strip can be selected according to the size of the dosimeter, the fixing effect of the personal dosimeter is improved, and meanwhile, due to the design of the neck collar sleeve made of cotton materials, the safety of the user is improved. The neck surrounding sleeve not only improves the wearing comfort, can adapt to wearers with different neck surrounding sizes, but also is convenient to disassemble, clean and replace, and is high in practicability.

An imaging system is used for capturing images of a subject during X-ray examination. It comprises a video camera system, separate to the X-ray image generation, for generating video camera images. The video camera images are processed to determine that a captured video camera image is synchronized with an X-ray exposure, based on saturation of one or more pixels of the captured video camera image. Timing information can then be generated associating the timing of the video camera images with the timing of the X-ray exposure.

To provide a dosimetry device for quantifying the dosage of radiation emitted from a radiation source.SOLUTION: A dosimetry device for quantifying the dosage of radiation provided herein comprises (i) a radiation dose indicator, (ii) optical means for capturing color changes, and (iii) software means for comparing optical density of the dose indicator to a predetermined calibration curve, and is configured to quantify the dosage of radiation emitted from the radiation source.SELECTED DRAWING: Figure 1

Provided herein is a dosimetry device for quantifying the dosage of radiation emitted from a radiation source, the device comprising: (i) a radiation dose indicator; (ii) an optical means to capture the color change; and (iii) a software means to compare the optical density of the dose indicator as compared to a predetermined calibration curve. Also provided herein is a method of quantifying the dosage of radiation emitted from the radiation source. Further provided herein is use of said dosimetry device in various medical, food and industrial applications.

Computer-implemented method for correcting an X-ray image (1) based on imaging by an X-ray device (2) with an X-ray source (3) and an X-ray detector (4) during a first time interval (6) and specifying a respective X-ray image value (8) for at least one image point (7), comprising the steps: - Receiving the X-ray image (1), - Receiving several dark images (9), wherein the respective dark image (9) is based on an image data acquisition by the X-ray detector (4) during a respective sub-interval of a second time interval (10) preceding the first time interval (6), during which no X-ray radiation is irradiated onto the X-ray detector (4), and indicates a respective dark image value (11) for the respective image point (7), - Predicting a respective night luminescence value (12) for the respective pixel (7) in the X-ray image (1), depending on the dark frame values ​​(11) of several of the dark frames (9) for the respective pixel (7), - Correcting the X-ray image (1) by determining a respective corrected X-ray image value (14) for the respective image point (7) depending on the respective X-ray image value (8) and the respective afterglow value (12).

Apparatus and methods for curing adhesives in a robotic assembly cell and evaluating the curing at a same time or in parallel are disclosed. An apparatus in accordance with an aspect of the present disclosure comprises a radiation source configured to emit radiation to cure an adhesive in a curing area during an assembly process, a radiation guide configured to transmit the radiation emitted from the radiation source to the curing area, and a sensor configured to measure a reflection of the transmitted radiation reflected off the curing area during the curing of the adhesive, wherein the sensor is positioned proximate to the radiation guide; and a controller configured to determine whether the measured reflection satisfies a threshold and, based on a determination that the measured reflection does not satisfy the threshold, to signal a remedial action of the assembly process.

This invention provides a system for online tracking and monitoring of proton and heavy ion therapy for tumors, belonging to the field of radiotherapy for tumors. The system includes: controlling a proton or heavy ion beam to irradiate the tumor target area of ​​a patient; acquiring signal intensity and spatial distribution information of characteristic X-rays emitted from the patient; acquiring a real-time Bragg peak dose deposition distribution image of the proton or heavy ion beam within the tumor target area based on the signal intensity and spatial distribution information; acquiring positional and dose deviations based on the real-time image and a preset treatment plan image; and dynamically adjusting the beam current parameters of subsequently emitted proton or heavy ion beams based on the positional and dose deviations. This invention achieves visualization and closed-loop control of in vivo dose deposition by real-time detection of characteristic signals generated during treatment.

Apparatuses and methods for curing adhesive and simultaneously or in parallel evaluating curing in a robotic assembly unit are disclosed. An apparatus according to aspects of the present disclosure includes a radiation source configured to emit radiation during an assembly process to cure an adhesive in a cured region; a radiation guide configured to transmit radiation emitted from the radiation source to the curing area; and a sensor configured to measure a reflection of the transmitted radiation reflected back from the curing area during curing of the adhesive, where the sensor is located proximate the radiation guide; and a controller configured to determine whether the measured reflections meet a threshold, and to signal a remedial action of the assembly process based on the determination that the measured reflections do not meet the threshold.

The invention relates to the technical field of radiation dose measurement, particularly provides a radiation dose measurement method for a mixed radiation field, and aims to solve the technical problem that radiation dose contribution in the mixed radiation field cannot be efficiently discriminated by an existing method. In order to achieve the purpose, the radiation dose measurement method of the mixed radiation field comprises the steps that a first film and a second film are fixed to the same radiation field, and the irradiation environment of the first film and the irradiation environment of the second film are controlled to be consistent; after the first film and the second film are irradiated, obtaining a first film gray level image and a second film gray level image after irradiation; determining an actual gamma dose based on the first film grayscale image; and determining the actual neutron dose based on the second film grayscale image and the actual gamma dose. Therefore, the actual gamma dose and the actual neutron dose can be accurately identified from the mixed radiation field.