11 results about "Tissue equivalent" patented technology

The invention relates to a personal dosimeter for neutron and photon mixed radiation detection and a detection method, the dosimeter comprises a base, an upper cover and three groups of detection assemblies, and the base is provided with three grooves which are distributed in parallel and respectively accommodate a first detection assembly, a second detection assembly and a third detection assembly. The first detection assembly and the second detection assembly each comprise a neutron absorber with grooves formed in the upper portion and the lower portion and a 6Li thermoluminescence detector pair and a 7Li thermoluminescence detector pair, and separated measurement of the dose of thermal neutrons, medium-high energy neutrons and gamma rays is achieved. The third detection assembly comprises a neutron moderator and a solid track detector. Separation measurement of neutrons with different energies is realized through track density difference. The upper cover is provided with a measuring window, and tissue equivalent materials with different mass thicknesses are adopted and correspond to the dose depth of Hp (10) and the dose depth of Hp (3). Through combination of multi-channel reading and correction coefficient calculation, dose evaluation of gamma rays, thermal neutrons and fast neutrons on different tissue depths can be realized. The device is compact in structure, and is suitable for personal dose monitoring in a complex radiation environment.

The application discloses a micro-network type tissue equivalent proportional counter, and relates to the field of radiation measurement. The counter comprises a cathode part, a micro-network electrode, a collector and an anode plate which are sequentially stacked from top to bottom. The cathode part comprises a cathode and an insulating ring. The cathode is a cylinder with a sealed upper surface. The inner side of the cathode is coaxially provided with the insulating ring. The outer wall of the insulating ring is attached to the inner wall of the cathode. The column on the inner side of the insulating ring forms a sensitive space. The micro-network electrode is a circular mesh electrode. The annular lower surface of the cathode is connected to the micro-network electrode through insulating material. The micro-network electrode and the collector have a set interval. The micro-network electrode and the collector are connected through insulating material. The cross section of the insulating material between the micro-network electrode and the collector is annular and coaxial with the lower surface of the cathode. The collector is a conductive electrode on the anode plate. The sensitive space is used to fill tissue equivalent gas. The application reduces the manufacturing cost, improves the performance of the counter and the structural stability.

The present application relates to a kind of skull model and preparation method for head inside irradiation living body measurement device calibration, wherein the skull model includes skull, epidermis layer and radioactive source;The radioactive source is arranged on the surface of the skull, and is located on the skull corresponding parietal bone and frontal bone position;The epidermis layer is fixed on the surface of the skull by pouring, and is tissue equivalent material.The present application sets up radioactive source on the surface of the skull, and uses tissue equivalent material as epidermis layer, to form skull model, the model can simulate the deposition in the skull after human body is taken into parent bone nature nuclide, i.e.as the real human body nuclide intake amount according to the amount of radioactive source setting, so as to more accurately calibrate the scale of head inside irradiation living body measurement device, to improve the measurement precision of human body nuclide activity.

The utility model relates to the technical field of electron density motifs, in particular to a radiomics characteristic repeatability verification motifs. According to the technical scheme, the device comprises an equivalent material base for 3D printing, wherein an insertion channel I and an insertion channel II are formed in one side of the equivalent material base for 3D printing; a test tube insertion rod is placed in the insertion channel I, and an equivalent tissue density rod is placed in the insertion channel II; and a laser lamp groove is formed in the vertical direction. According to the utility model, radiomics characteristics of a region of interest can be effectively extracted and analyzed by virtue of contrast differences of liquids with different equivalent densities in the insertion rod and a base material under CT scanning, the cost is low, the design is light and convenient, the structure is compact, the application is wide, and multi-center imaging contrast and single-center repeated scanning can be assisted; the device can also be used for CT imaging quality control and radiotherapy electron density calibration, and a practical and efficient tool is provided for related fields.

The invention discloses a three-dimensional radiation dose reconstruction method based on digital twinning, and the method comprises the steps: building a scintillation fiber dosimeter physical response model, and obtaining a linear relation between an optical signal and a dose; segmenting human organs based on a CT image, constructing a digital physical model by using a tissue equivalent material, and carrying out geometric modeling; calculating a dose field, and obtaining three-dimensional dose data; inserting an optical fiber dosimeter into a preset position of the phantom for measurement, and calculating an actual dose in combination with the linear relation; and the actually measured data is applied to an area with relatively large dose gradient change in the dose matrix obtained by calculation, so that three-dimensional dose distribution is reconstructed. According to the method, a closed loop is realized through real-time interaction of a physical model and a calculation model, the simulation time is shortened from several hours to a minute level through parallel calculation, the problem that three-dimensional dose distribution cannot be rapidly obtained through a traditional method is solved by combining optical fiber high-resolution measurement and total-space calculation, and the measurement deviation of a non-uniform medium is reduced through an energy segmentation correction strategy.

This invention provides a brain tissue equivalent material for medical imaging equipment and its preparation method, belonging to the technical field of tissue equivalent materials. The brain tissue equivalent material of this invention comprises the following raw materials in the indicated mass fractions: 20-35% bisphenol A epoxy resin, 10-15% octyl glycidyl ether, 1-5% urea, 1-5% calcium carbonate, 1-5% sodium dihydrogen phosphate, 1-5% dipotassium hydrogen phosphate, 15-35% polyethylene, 15-25% methyl methacrylate, and 5-15% trimethylhexanediamine. The CT value of the brain tissue equivalent material of this invention is highly consistent with that of real brain tissue, successfully covering the typical range of gray and white matter. The brain tissue equivalent material exhibits excellent wide-spectrum attenuation characteristics; within the commonly used energy range of 60-200 keV in clinical CT equipment, the deviation of the X-ray attenuation coefficient from the target brain tissue material is controlled within 5%, demonstrating excellent spectral stability and simulation accuracy.

The application discloses a kind of multi-scale dosimetry in-situ synchronous measurement methods for precision radiotherapy, belong to radiation dose measurement field.Macroscopic, nano, micro-dose measurement module is sequentially arranged along beam direction, and macroscopic module has central micropore.Particle beam passes through central micropore, and absorbed dose is measured by macroscopic module, simultaneously enters nano-dose module, and ionization counting is realized by low-density tissue equivalent gas, and nano-dosimetric quantity is measured;Particle subsequently enters micro-dose module, and micro-dosimetric quantity is measured by solid-state detector.Nano-dose module makes particle energy loss less than 1%, ensures that three-scale signal is from the same particle, realizes macroscopic-micron-nano dosimetric quantity in-situ synchronous measurement, and eliminates the error of traditional time-sharing, position measurement.

This application discloses a skull tissue equivalent material, its preparation method, and its application, relating to the field of biomedical materials technology. The skull equivalent material disclosed in this application comprises the following raw materials: 15-30 parts bisphenol A epoxy resin, 5-15 parts octyl glycidyl ether, 5-15 parts urea, 1-10 parts red phosphorus, 1-8 parts magnesium sulfate, 1-8 parts sodium sulfate, 15-45 parts dicalcium phosphate, and 5-15 parts trimethylhexanediamine. The skull equivalent material disclosed in this application has multiple advantages, including precise CT value matching, stable attenuation over a wide energy spectrum, adjustable density, and suitability for multiple age groups. It also solves the problems of large simulation deviations, inability to cover the entire skull region, and uncontrollable radiation characteristics of existing equivalent materials. It features high simulation fidelity, stable performance, and simple processing, meeting the high-precision requirements of medical imaging calibration, radiotherapy dose verification, and radiology teaching phantoms.

This invention discloses an adhesive tissue equivalent compensation membrane for breast cancer radiotherapy, relating to the field of radiotherapy compensation membrane technology. It includes: an adhesive layer on one side that directly contacts the skin; a variable tissue equivalent layer; and an outer protective layer for providing mechanical protection while also ensuring compatibility with radiotherapy equipment. The proposed zoned adjustable microchannel / microcavity filling mechanism can locally adjust the relative electron density and water equivalent according to the radiation path, thereby achieving point-to-point spatial matching with the equivalent tissue thickness required by the radiotherapy plan. This mechanism fundamentally reduces dose perturbations caused by surface geometry irregularities or tissue inhomogeneities, allowing for more reliable reproduction of the dose distribution in the treatment plan during actual irradiation, and reducing the risk of underdose or overdose in near-surface and interface regions.

This invention relates to a particle beam energy monitoring device and method. The device includes a tissue equivalent proportional counter, a data acquisition module, and a processing module. The tissue equivalent proportional counter is connected to the data acquisition module, and the processing module is connected to the data acquisition module. The tissue equivalent proportional counter is used to receive irradiation from a particle beam and generate an ionization signal under the irradiation of the particle beam. The data acquisition module is used to acquire the ionization signal output by the tissue equivalent proportional counter and obtain the pulse amplitude spectrum of the particle beam based on the ionization signal. The processing module is used to determine the energy of the particle beam in real time based on the pulse amplitude spectrum of the particle beam.