38 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 brachytherapy applicator and method of use involve source guides that assume a desired curving, non-linear configuration. A flexible source catheter follows the shape of the source guides when inserted therein. Radiation dose received in various tissue areas can be better controlled using the invention, and the ratio of cavity surface dose to prescription depth dose can be lowered. With sequential manipulation of the source via movement of the catheter, the applicator can deliver radiotherapy to a treatment plan with local variation to prevent overdose, through either stepped or continuous movement of the source. Source guides can be fixed in position and arranged in bowed configuration around a generally central balloon axis, either attached to the balloon wall or not, and the series of off-center guides can be used to shape the dose delivered.

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.

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.

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 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.

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.

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.

A brachytherapy applicator and method of use involve a source guide that assumes a desired curving, non-linear configuration when inserted into an inflated balloon of the applicator. A flexible source catheter follows the shape of the source guide when inserted into the balloon. Radiation dose received in various tissue areas can be better controlled using the invention, and the ratio of cavity surface dose to prescription depth dose can be lowered. With rotation of the curving source guide coupled with translation of the source via longitudinal movement of the catheter, the applicator can approximate a spherical source, through either stepped or continuous movement of the source and source guide.

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 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 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 relates to obtaining an energy spectrum of a focused ion beam technical field. It is provided a method for obtaining an energy spectrum of a focused ion beam when a Bragg peak chamber is used to measure an integrated depth dose, IDD. The method comprises the steps of: simulating doses of a set of nominally mono energetic focused ion beams; determining a lateral extension of a Bragg peak chamber to evaluate; calculating a set of theoretic component IDD curves, CIDDs, by laterally integrating the dose of the simulated set of the nominally mono energetic focused ion beams, over the lateral extension of the Bragg peak chamber; storing calculated CIDDs; obtaining a measured IDD of a focused ion beam with a nominal energy using the Bragg peak chamber; and performing a fit of a linear combination of CIDDs to the measured IDD, to determine an energy spectrum for the focused ion beam with the nominal beam energy.

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 utility model relates to the radiotherapy field, and specifically discloses a proton beam energy quality control die body, comprising a rack, a mobile adjusting mechanism and a wedge-shaped module assembly, the inner side of the rack is slidingly provided with a lifting seat, the mobile adjusting mechanism and the wedge-shaped module assembly are installed on the lifting seat, and the rack is provided with a lifting mechanism; the wedge-shaped module assembly comprises a base and a plurality of wedge-shaped modules detachably installed on the base, the wedge-shaped modules are different in height, an ionization chamber array is arranged in the base, the portion, located above the wedge-shaped module assembly, of the rack is provided with a proton treatment head, and the proton treatment head is connected with the ionization chamber array. The proton treatment head is used for emitting proton beams to the wedge-shaped module. According to the proton beam energy quality control die body disclosed by the utility model, the design of multiple groups of wedge-shaped modules is adopted, so that continuous depth dose distribution can be obtained through single irradiation, the efficiency of energy verification is greatly improved, and the requirement of repeated measurement is reduced.

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.

The invention provides a beam distribution system and method and radiotherapy equipment, and the system comprises a beam spot forming device which is used for carrying out the transverse diffusion of a beam spot of an ion beam from an accelerator, and shaping the beam spot into a uniform square beam cross section with a preset size; the scanning magnet is used for positioning the uniform square beam cross section to a tumor target area to form a square irradiation field; the beam modulation system is used for modulating the dose distribution of the ion beam in the tumor target area; the control system is used for controlling the accelerator, the beam spot forming device, the scanning magnet and the beam modulation system to work cooperatively; the scanning magnet is controlled to splice the plurality of square irradiation fields on the transverse section of the tumor target region, the depth dose modulation unit is controlled to modulate ion dose distribution in the depth direction of the tumor target region, and a preset three-dimensional irradiation volume is constructed in the tumor target region.

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.