31 results about "Depth dose" patented technology

A stand-alone calculator enables multi energy electron beam treatments with standard single beam electron beam radiotherapy equipment thereby providing improved dose profiles. By employing user defined depth-dose profiles, the calculator may work with a wide variety of existing standard electron beam radiotherapy systems.

A beam profile measurement detector is a tool to efficiently verify dose distributions created with active methods of a clinical proton beam delivery. A Multi-Pad Ionization Chamber (MPIC) has 128 ionization chambers arranged in one plane and measure lateral profiles in fields up to 38 cm in diameter. The MPIC pads have a 5 mm pitch for fields up to 20 cm in diameter and a 7 mm pitch for larger fields, providing an accuracy of field size determination of about 0.5 mm. The Multi-Layer Ionization Chamber (MLIC) detector contains 122 small-volume ionization chambers stacked at a 1.82 mm step (water-equivalent) for depth-dose profile measurements. The MLIC detector can measure profiles up to 20 cm in depth, and determine the 80% distal dose fall-off with about 0.1 mm precision. Both detectors can be connected to the same set of electronics modules, which form the detectors' data acquisition system. The detectors operate in proton fields produced with active methods of beam delivery such as uniform scanning and energy stacking. The MPIC and MLIC detectors can be used for dosimetric characterization of clinical proton fields.

A radiation measuring device having a plurality of sensors configured to generate charges in response to the radiation includes a signal processing device. The signal processing device uses an signal generated by a proton beam irradiation device upon changing of beam energy and causes accumulation values of charges output from the sensors to be separately stored in a main control device for each value of the energy. The main control device calculates depth dose profiles for values of the beam energy from the accumulation values stored in the main control device and representing the charges. The main control device calculates a range of the beam for each of the values of the beam energy from the depth dose profiles, corrects the depth dose profiles for the values of the beam energy using a correction coefficient that depends on the range and sums the corrected depth dose profiles.

The embodiment of the invention discloses a beam evaluation method apparatus, and equipment for boron neutron capture therapy, and a storage medium. The method comprises the following steps: acquiringa neutron energy spectrum to be evaluated and a photon energy spectrum to be evaluated in the same epithermal neutron beam; inputting energy values of a plurality of sets of monoenergetic neutrons inthe neutron energy spectrum to be evaluated into a first depth dose model and a second depth dose model, to obtain a plurality of sets of first curve data and a plurality of sets of second curve data, and sequentially inputting energy values of a plurality of sets of single-energy photons in the photon energy spectrum to be evaluated into a third depth dose model to obtain a plurality of sets ofthird curve data; through the plurality of sets of first curve data, determining the plurality of sets of second curve data and the plurality of sets of third curve data, the dominant depth and the therapeutic gain to evaluate the therapeutic effect of the epithermal neutron beam, so that the evaluation efficiency of the therapeutic effect of the epithermal neutron beam is effectively improved, and the beneficial effect of the rapid adjustment of the neutron shaping device is realized.

The present invention relates to a 4D dose reconstruction device, and discloses a dose reconstruction method based on tumor motion tracking and radiotherapy, including: step S1, obtaining the tumor centroid motion core, and obtaining the tumor centroid in the LR direction, CC direction and AP direction Time function; step S2, obtain the motion parameters of the tumor center of mass according to the time function in the LR direction and the CC direction in step S1; step S3, control the driving module to drive the dose verification device LR and CC to move in two directions according to the motion parameters in step S2 , step S4, the influence of AP direction movement on the dose is realized by real-time online correction of the percentage depth dose PDD parameter method, and finally realizes the 4D dose reconstruction of the dose verification device and obtains the reconstructed 4D dose data. The introduction of the three-dimensional movement factor of the tumor in the present invention can effectively improve the radiotherapy plan of the tumor, make the final treatment of the patient closer to the actual situation, and greatly improve the safety and effectiveness of the radiotherapy of the tumor.

The present invention relates to an electric heating thermoluminescence card dosimeter used for monitoring the radiation dose in the nuclear radiation dose monitoring field. The thermoluminescence card dosimeter comprises an upper casing, a bottom casing, a tray, a pressure sleeve, a positioning plate and a coating film, the tray is embedded between the positioning plate and the pressure sleeve, adetector is placed on the tray and is covered by the coating film, and the upper casing and the bottom casing are connected via rivets. The thermoluminescence card dosimeter is smooth in overall surface, beautiful in appearance, light in weight, small in size and compact in structure and good in function, is dustproof, water proof, safe and reliable, is not easy to damage and simple and convenient to turn on, can realize a superficial dose Hp (0.07), depth dose Hp (10), eye body dose Hp (3) and energy discrimination multi-parameter measurement function, and is suitable for measuring the personal conventinal dose and the accident dose of the X, gamma and beta rays.

The invention discloses a method for testing a radiation-resistant index of a star sensor lens. The method comprises the following steps of: performing dose scale calibration on a developing film dose meter in a standard dose field, and converting optical density into an absorbed dose value; manufacturing the star sensor lens material into a pair of wedge-shaped optical modes, arranging the inclined surfaces of the pair of wedge-shaped optical modes opposite to each other, and setting the developing film dose meter subjected to dose scale calibration between the inclined surfaces of the two wedge-shaped optical modes; establishing a conversion relation between the length of the developing film dose meter and the depth of the optical modes, and obtaining a depth dose distribution curve of electron beams in the optical modes; irradiating the optical modes to the specific accumulated dose by adopting an electron accelerator, measuring the optical density change value of the developing film dose meter by adopting a spectrophotometer, and obtaining a dose distribution curve of the star sensor lens; and measuring the thickness of the star sensor lens, and querying to obtain the radiation-resistant index which corresponds to the thickness of the star sensor lens on the dose distribution curve. According to the method, the star sensor lens can be subjected to ground irradiation test of the radiation-resistant index.

The invention discloses a method suitable for electron beam radiation processing operation identification. The method comprises the steps of: (1) preparing 3 groups of equivalent-density simulation materials; (2) placing dose tablets in the simulation materials; (3) disposing a routine dosimeter in a specific place of the simulation material; ( 4 ) subjecting the 3 groups of simulation materials to electron beam irradiation; ( 5) reading the values of each group of the dose tablets and the routine dosimeter, and calculating related proportional coefficients; and (6 ) calculating the average value of dose distribution of all dose tablets on one layer of the 3 groups of simulation materials, and drawing a dose depth distribution map. The method of the invention solves the problems of poor uniformity of simulation materials, great uncertainty of depth dose distribution, large errors in the obtained proportional coefficients between the routine dosimeter and a maximum, minimum dose.

The invention discloses a radiotherapy dosage rapid quantitative method, comprising the steps of: step 1, storing accelerator data in a database according to energy grades; step 2, setting the field size m and depth dose n of radiotherapy dosage to be calculated; step 3, looking up two data points m1 and m2 adjacent to the field size m, and two data points n1 and n2 adjacent to the depth dose n in step 2 in the database to obtain corresponding PDD data; and step 4, utilizing the PDD data obtained in step3, and employing a linear interpolation algorithm to calculate PDD (m,n) set in step 2. Compared with a hand computation method, the method of the invention has an input time less than one minute, and can rapidly obtain an accurate dosage result through a computer; a user can rapidly obtain a result by only inputting parameters to be calculated, thereby greatly facilitating doctor operation, and realizing higher precision than hand computation.

The invention relates to the technical field of obtaining energy spectra of focused ion beams. The present invention provides a method of obtaining the energy spectrum of a focused ion beam when measuring integrated depth dose IDD using a Bragg cell. The method comprises the steps of: simulating the dose of a nominal set of monoenergetic focused ion beams; determining the lateral extension of the Bragg chamber for evaluation; and by laterally integrating the simulated set of nominal monoenergetic ion beams over the lateral extension of the Bragg chamber. Focuses the dose of the ion beam, calculates a set of theoretical component IDD curves CIDD; stores the calculated CIDD; uses a Bragg peak cell, obtains the measured IDD of the focused ion beam with nominal energy; and performs a linear combination of CIDD on the measured IDD to determine the energy spectrum for a focused ion beam of nominal beam energy.

A method for preparing lead selenide polycrystalline thin films based on oxygen ion beam assisted deposition proposed by the present invention aims at the incorporation amount and depth of oxygen that cannot be accurately controlled in the PbSe thin film prepared by the current physical vapor deposition combined with atmosphere annealing method distribution problem, use ion beam assisted deposition technology, adopt static mixing method, carry out oxygen ion assisted bombardment on the surface after the film growth is completed, and then perform subsequent vacuum annealing on the film to prepare PbSe polycrystalline with good photosensitive properties and stability film. This method can precisely control the implantation dose and depth distribution of oxygen ions, and separates the oxygen doping from the polycrystallization process to increase the freedom of process optimization. The optical I-V characteristics, SEM, XRD and other preliminary characterizations of the prepared samples show that the PbSe polycrystalline thin film prepared by this method has good photoelectric properties and surface properties.

Disclosed is a beam evaluation method, device, equipment and storage medium for boron neutron capture therapy, the method comprising: respectively dividing the neutron energy spectrum to be evaluated and the photon energy spectrum to be evaluated in A plurality of energy sub-spectrum intervals; obtain the fluence of each sub-energy spectrum interval in the neutron energy spectrum to be evaluated as the first fluence, and obtain the fluence of each sub-energy spectrum interval in the photon energy spectrum to be evaluated as the second injection Substitute the first fluence into the first depth dose formula and the second depth dose formula to obtain the first curve data and the second curve data, and substitute the second fluence into the third depth dose formula to obtain the third curve Data; through the data of the first curve, the data of the second curve and the data of the third curve, the dominant depth and treatment gain are determined to evaluate the therapeutic effect of the epithermal neutron beam, which effectively improves the evaluation of the therapeutic effect of the epithermal neutron beam Efficiency, realizing the beneficial effect of quickly adjusting the neutron shaping device.

The invention discloses a dynamic measurement method of accelerator dose, which solves the problem of low dynamic measurement accuracy in the prior art, and has the beneficial effects of improving the accelerator output dose measurement accuracy and fast measurement speed. The specific scheme is as follows: 1. A dynamic measurement method of accelerator dose, for the percentage depth dose, the dynamic measurement of accelerator dose in the magnetic field environment is carried out by interpolation method, the interpolation method is the Spine function interpolation method to enrich the data of the dataset, and the particle swarm algorithm is used for dynamic measurement output. Optimization.