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 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 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 provides a device and a method for measuring depth dose distribution based on a proton irradiation source. The device comprises: a first wedge-shaped die body and a second wedge-shaped die body; a shielding layer, which is arranged on the upper surface of the second wedge-shaped die body and used for receiving proton beams generated by the irradiation source; and a first developing film dosimeter, which is arranged between the first wedge-shaped die body and the second wedge-shaped die body and is used for receiving the proton beams passing through the second wedge-shaped die body. According to the invention, the first developing film dosimeter arranged between the first wedge-shaped die body and the second wedge-shaped die body can acquire the depth dose distribution of theproton beams in the second wedge-shaped die body in one irradiation, the measurement result is accurate, the measurement method is simple, and the measurement cost is low; the second wedge-shaped diebody is made of a polyethylene material and can be equivalent to proton deposition energy and particle energy spectrum information at different depths in human tissue, and research results have a goodguiding effect on astronaut radiation shielding, aerospace electronic component radiation damage and radiation effect tests.

The invention relates to a beam evaluation method for boron neutron capture therapy, a beam evaluation device for boron neutron capture therapy, an apparatus and a storage medium. The method includesthe following steps that: a neutron energy spectrum to be evaluated and a photon energy spectrum to be evaluated in an epithermal neutron beam are separately divided into a plurality of sub-energy-spectrum intervals; the fluence of the sub-energy-spectrum intervals in the neutron energy spectrum to be evaluated is obtained and is adopted as first fluence, and the fluence of the sub-energy-spectrumintervals in the photon energy spectrum to be evaluated is obtained and is adopted as second fluence; the first fluence is substituted into a first depth dose formula and a second depth dose formulaseparately, so that first curve data and second curve data are obtained, and the second fluence is substituted into a third depth dose formula, so that third curve data are obtained; and dominant depth and treatment gain are determined according to the first curve data, the second curve data and the third curve data, so that the therapeutic effect of the epithermal neutron beam is determined. Withthe beam evaluation method for boron neutron capture therapy, the beam evaluation device for boron neutron capture therapy, the apparatus and the storage medium adopted, the evaluation effectivenessof the therapeutic effect of the epithermal neutron beam can be effectively improved, and a neutron shaping device can be quickly adjusted.

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 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 invention discloses a pencil beam dose algorithm based on self consistency. An original three dimensional pencil beam dose distribution is decomposed into a product of two functions, wherein the two functions respectively represent two dimensional dose distributions of a beam with finite width and infinite length. The algorithm uses two dimensional data to obtain a three dimensional dose distribution of a pencil core, which means a dose distribution of a rectangular pencil beam is processed to be a product of a depth dose distribution and two transverse distributions, wherein the depth dose distribution represents a dose value along the center axis of the pencil beam (denoted as a Z direction) and is a one dimensional distribution, and the transverse distributions represent the relative dose distributions in XZ and YZ planes and are two dimensional distributions. The algorithm reduces storage requirements, and the form of the algorithm is simple which facilitates the calculation and improves the calculation speed. Meanwhile, the decomposition form can satisfy requirements of symmetry and self consistency, which means uniform dose distributions can be produced under uniform field intensity.

Novel normoxic N-(Hydroxymethyl) acrylamide (NHMAGAT) polymer gel dosimeters for MRI scanning are introduced for radiotherapy planning system. The composition of the NHMAGAT polymer gel and method of making the NHMAGAT polymer gel dosimeter are disclosed. The dosimeters are irradiated with Varian Rapid Arc linear systems at different absorbed doses. The results show that the percent depth dose and 2D plan dose distribution of NHMAGAT polymer gel dosimeters are in a good agreement with the ionization chamber measurements and CT planned dose distribution, respectively.

The invention provides a method for predicting the degradation of the optical properties of ZnO thermal control coatings by electron irradiation, which belongs to the field of space environment engineering. The present invention utilizes the existing degradation model of the optical properties of the ZnO thermal control coating under electron irradiation, obtains full-spectrum diffuse reflectance data through experiments, and calculates the absorption corresponding to each electron irradiation fluence point according to the data. rate change. Afterwards, the dose depth distribution of electrons in the ZnO thermal control coating was calculated. Then, the unknown parameters in the degradation model are solved to obtain the degradation model for this ZnO thermal control coating. The obtained model is used to predict the degradation of optical properties of ZnO thermal control coating under electron irradiation. The method of the invention greatly reduces the workload of the electron irradiation test of the ZnO thermal control coating, and is of great significance for studying the degradation law of the optical properties of the ZnO organic white paint under space electron irradiation and the prediction of long life.

The invention relates to an accelerator radiant matter measurement method. The measurement method comprises the steps of disposing an ionization chamber in a water tank, wherein the axial direction ofthe ionization chamber is perpendicular to the bottom face of the water tank; adjusting the angle of a machine head of an accelerator, so that the direction of ray beams emitted by the accelerator isperpendicular to the axial direction of the ionization chamber; turning on the accelerator and a water tank system controller, and controlling the ionization chamber or the water tank to move from afirst position to a second position in the direction of the ray beams through the water tank system controller; measuring the percent depth dose PDDx and the percent depth dose PDDy of the ray beams corresponding to the first position and the second position in the water tank through a dosimeter, wherein x and y are thicknesses of water molds corresponding to the first position and the second position respectively; changing a dose rate value of the accelerator or changing a set dose MU for performing multiple groups of tests to obtain multiple groups of PDDx and PDDy; performing calculation according to PDDx and PDDy to obtain multiple groups of radiant matter indexes, wherein the radiant indexes are tissue phantom ratios TPRx and TPRy.