17 results about "Bragg peak" patented technology

The invention relates to the field of ocean current remote sensing, and relates to a vector flow inversion method combining a single-station ground wave radar and a satellite-borne SAR, and the method mainly comprises the steps: calculating the frequency deviation of a first-order Bragg peak of the ground wave radar, carrying out the inversion of the sea surface radial flow of the ground wave radar, and carrying out the inversion of the sea surface radial flow of the SAR through employing a Doppler centroid anomaly method; interpolating a ground wave radar radial flow result to an SAR data grid through bilinear interpolation; inverting a single-station vector flow based on a ground wave radar radial flow result, projecting single-station vector flow data with high confidence coefficient to an SAR range direction, calculating a difference mean value of a projection flow velocity and an SAR radial flow velocity, and further calibrating the SAR radial flow; and combining a ground wave radar radial flow result with the calibrated SAR radial flow to invert a vector flow. According to the method, the defect of ocean current observation through a single means is overcome, high-precision inversion of the combined vector flow is achieved, and the method has important significance on ocean environment monitoring, disaster forecasting, shipping safety and the like.

The invention relates to the technical field of high-energy ion irradiation, and provides a device for observing the interaction radiation characteristics of high-energy ions and substances in a Bragg peak region, which comprises a transparent box body, a beam shaping mechanism, a beam collimating mechanism, an online adjusting mechanism and an X-ray detector, the beam shaping mechanism and the beam collimating mechanism are oppositely arranged on the outer wall of the transparent box body; an objective table is arranged on the online adjusting mechanism and is used for adjusting the position of the objective table; the X-ray detector is used for collecting X-ray spectrum information generated by interaction of high-energy ions and substances in real time. According to the device for observing the interaction radiation characteristics of the high-energy ions and the substances in the Bragg peak region, the to-be-measured substances are placed at different positions on the ion beam transmission path, so that the interaction radiation characteristics of the ion beam and the target substance under different energies are obtained, and assistance is provided for accurate positioning and heavy ion treatment of the Bragg peak region.

The invention relates to a joint inspection system and a method of inspecting a joint in a structure. In one method, an ion beam source sends an ion beam into a first surface of a structure with an ion beam to form an acoustic pulse source at a depth in the structure corresponding to a Bragg peak of the ion beam, wherein the acoustic pulse source is proximate to a joint. A propagation time and a magnitude of an acoustic pulse generated by the acoustic pulse source are sensed by an acoustic sensor located at a second surface of the structure, thereby forming a response, wherein the joint is located between the acoustic pulse source and the second surface.

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.

One or more new metrics are introduced into the treatment planning process. More specifically, a correcting factor / metric referred to herein as the critical / repair ratio index is introduced, and / or a correcting factor / metric referred to herein as the spatial periodicity of critical isodose value is introduced. By using these metrics, the expected sparing from the spatial distribution of dose is better accounted for in treatment modalities including spatially fractionated radiation therapy (SFRT) in general and SFRT with ultra-high dose rates in particular. According to a treatment planning strategy, the target can be covered by a Spread-Out Bragg Peak, to optimize and / or homogenize the dose distribution at the target level but still benefit from the sparing effect of SFRT at the healthy tissue level. Delivery techniques include a dynamic focusing technique and a magnetic beam steering technique. Enhancing dose rate enables maximizing the peak-to-valley dose distribution with SFRT despite patient motion.

Systems and methods for proton therapy treatment planning can include a treatment planning system determining positions of a plurality of energy layers across a dimension of a planning target volume (PTV) along a proton field direction, such that each pair of consecutive energy layers are spaced by a distance that is proportional to a width of a Bragg peak corresponding to at least one energy layer of the pair of energy layers. The treatment planning system can generate a proton therapy plan for irradiating the PTV according to the sequence of energy layers.

This invention relates to a method for inverting the initial ground distance of a target based on anomaly echoes from its exhaust plume, belonging to the field of high-speed maneuvering target detection technology. This invention addresses the challenges of detecting, locating, and accurately inverting the initial distance of high-speed targets under complex backgrounds. The steps of this invention include: S1: ionospheric model simplification; S2: extraction of Bragg peak offset; S3: Doppler spectral feature extraction; S4: establishment of joint anomaly indices; S5: adaptive threshold detection and centroid localization; S6: nonlinear deviation fitting to obtain the true ground distance value. This invention establishes a complete closed-loop link from anomaly echo detection to quantitative estimation of the target's initial ground distance. By combining physical modeling and data-driven approaches, it effectively eliminates systematic biases in distance inversion, providing high-precision prior distance information for trajectory analysis and state identification of high-speed maneuvering targets.

Embodiments of the present disclosure provide a shielding chamber for radiation protection, a radiation protection shielding device, and a FLASH therapy system. The shielding chamber for radiation protection includes an accommodation cavity and a first window and a second window arranged sequentially at intervals along a direction of a beam on the shielding chamber. The accommodation cavity is located between the first window and the second window. The first window and the second window are respectively in communication with the accommodation cavity. The first window is used for entry of the beam. The second window is used for a target object to pass through. The target object is accommodated in the accommodation cavity after passing through the second window. A geometric center point of the accommodation cavity is set as a Bragg peak of the beam.

This disclosure provides a beam delivery method, apparatus, electronic device, and medium. The method includes: dividing the cross-sectional shape of a target area into several equally spaced scanning points; delivering the same dose of particles to each scanning point based on a point-by-point active position delivery method, forming a uniform beam field distributed in a plane perpendicular to the beam direction. The shape of the uniformly distributed beam field is consistent with the shape of the target area and covers the entire target area. The depth, Bragg peak broadening, and penumbra of the uniformly distributed beam field are adjusted using a beam modulation module, and the adjusted uniformly distributed beam is delivered to the target area. This method reduces beam waste, increases beam utilization, shortens treatment time, reduces secondary radiation and induced radioactivity, and effectively reduces positional and dose deviations caused by organ movement.

The embodiment of the present application discloses a river echo center frequency estimation method based on spectral peak search, comprising: smoothing Doppler spectrum; searching spectral peak, estimating bandwidth and centroid frequency of the first search spectral peak; judging the bandwidth of the first search spectral peak, if the spectral peak bandwidth is greater than twice the Bragg inherent frequency, it is determined that the energy of two Bragg peaks is close, the centroid frequency of the first search spectral peak is taken as the center frequency and the subsequent steps are omitted, otherwise it is determined that there is a large difference in the energy of two Bragg peaks, and step 4 is turned to; performing secondary spectral peak search, estimating the centroid frequency of the secondary search spectral peak, and turning to step 5; estimating the center frequency according to the centroid frequency of the spectral peak searched twice. The present application solves the problem of low center frequency estimation accuracy under the condition that there is a large difference in the energy of two Bragg peaks in the river echo Doppler spectrum, accurately extracts two Bragg peaks in the echo Doppler spectrum by using the threshold truncation method, and then estimates the center frequency, thereby improving the estimation accuracy of the center frequency.

This invention relates to the field of ocean current remote sensing, and specifically to a method for vector flow inversion combining single-station ground-wave radar (GWR) and spaceborne SAR. The method mainly includes: calculating the frequency shift of the first-order Bragg peak of the GWR; inverting the radial current of the sea surface from the GWR; inverting the radial current of the sea surface from the SAR using the Doppler centroid anomaly method; interpolating the radial current results from the GWR to the SAR data grid using bilinear interpolation; inverting the single-station vector flow based on the radial current results from the GWR; projecting the single-station vector flow data with high confidence onto the SAR range direction; calculating the mean difference between the projected current velocity and the SAR radial current velocity; and then calibrating the SAR radial flow; finally, inverting the vector flow by combining the radial current results from the GWR and the calibrated SAR radial flow. This method overcomes the limitations of single-method ocean current observation, achieving high-precision inversion of combined vector flow, and is of great significance for marine environmental monitoring, disaster forecasting, and shipping safety.

The invention discloses a Bragg peak screening, pseudo peak determination and missing value joint estimation method for sea state inversion and a sea state inversion method, and belongs to the technical field of sea state inversion. The objective of the invention is to solve the problem of high false peak misjudgment rate of a Bragg peak detection value in existing sea state inversion. According to the method, the Bragg peak offset is obtained based on the maximum ocean current velocity of the area needing to be detected, the first-order peak appearance range is determined, the average noise amplitude is calculated based on the background Doppler unit, the initial detection threshold value is determined, and the extreme points in the range are counted through the threshold value to achieve matching. Selecting a pair of candidate Bragg peaks of which the theoretical frequency difference value with the positive and negative Bragg peaks is closest to the theoretical difference value to obtain candidate Bragg peaks, determining a detection window range according to the positions of the candidate Bragg peaks, and judging the candidate peaks beyond and within the range and exceeding a dynamic detection threshold value as false peaks; and then, false peaks are eliminated, spatial correlation and statistical inference are fused through an LW-EM algorithm, Bragg peak joint estimation is realized, and then sea state inversion is realized.

The application discloses a kind of Bragg peak detector dose depth measurement system and method based on machine learning, it is characterized in that, including: Bragg peak detector array component, front-end readout electronics module, data acquisition and synchronization module and machine learning processing module;Bragg peak detector array component is used to convert received target particle beam into ionization signal;Front-end readout electronics module is used to respectively carry out charge sensitive amplification, shaping filtering and analog-digital conversion processing to the ionization signal output by each array component to obtain digital dose sequence;Data acquisition and synchronization module are used to synchronously collect the digital dose sequence output by front-end readout electronics module, and the spatial registration is carried out to the digital dose sequence collected, to obtain initial dose-depth distribution curve;Machine learning processing module is used to extract features and physical constraints to initial dose-depth distribution curve by preset depth learning model to obtain the dose depth measurement result of target particle beam.

The application provides a medical particle accelerator scanning type continuous irradiation beam distribution system, which comprises a mounting frame and a double scanning magnet, a scattering device, an energy continuous modulator and a switchable swingable collimator device arranged in sequence from far to near along a straight line from a point light source to an isocenter, wherein the double scanning magnet is responsible for deflecting and scanning a speed, the scattering device is responsible for changing a cylindrical scanning speed into a conical beam with a certain divergence angle, the switchable swingable collimator device is responsible for restricting the conical beam into a trapezoidal beam, and the energy continuous modulator is responsible for longitudinally pulling a Bragg peak to perform continuous irradiation of each irradiation unit.

The application provides a sky wave radar island echo detection method, which removes radio frequency interference and noise in a range-Doppler power spectrum, detects Doppler frequency shift of a pair of Bragg peaks of first-order sea clutter in a sea surface echo range-Doppler power spectrum, extracts a column of data located in the middle of the Doppler frequency shift of the Bragg peaks in the sea surface echo range-Doppler power spectrum as island echo data of the detection frequency, and obtains swept island echo data after processing data of all detection frequencies. The method has good real-time performance, can effectively obtain swept island echo data, and the data can be used as input data for island positioning, thereby being applied to engineering practice.

The invention provides a Bragg peak detector and a use method thereof. The Bragg peak detector comprises a first framework; the first framework comprises a first base, a second base and an annular assembly, the second base is arranged on the first base, the annular assembly comprises a first annular part and a second annular part, and the first annular part and the second annular part are symmetrically arranged on the two end sides of the first base in the first direction; the multi-layer ionization chamber is located between the first annular component and the second annular component in the second direction and arranged on the second base; the first medium assembly is arranged between the first annular component and the multi-layer ionization chamber in the second direction; the second medium assembly is arranged between the multi-layer ionization chamber and the second annular part in the second direction; wherein the multi-layer ionization chamber can respectively set the lengths of the first medium assembly and the second medium assembly along the second direction by moving on the second base along the second direction, so as to respectively adjust the distribution lengths of the liquid medium in the first medium assembly and the second medium assembly along the second direction.

The application relates to the technical field of high-energy ion irradiation, and provides a device for observing radiation characteristics of high-energy ions and substances in a Bragg peak area, which comprises a transparent box body, a beam shaping mechanism, a beam collimating mechanism, an online adjusting mechanism and an X-ray detector; the beam shaping mechanism and the beam collimating mechanism are oppositely arranged on the outer wall of the transparent box body; the online adjusting mechanism is provided with a sample stage and is used for adjusting the position of the sample stage; and the X-ray detector is used for collecting X-ray spectrum information generated by the interaction between high-energy ions and substances in real time. The device for observing radiation characteristics of high-energy ions and substances in a Bragg peak area can place the measured substances at different positions on the ion beam transmission path, obtain the radiation characteristics of the interaction between the ion beam and the target substances under different energies, and provide help for the accurate positioning of the Bragg peak area and heavy ion treatment.