6 results about "Tissue equivalent" patented technology

The application relates to a head K-40 phantom construction method and a head K-40 phantom. The head K-40 phantom is equivalent to a spherical phantom: equivalent tissue material is established, the average atomic number of the head tissue is calculated based on the element composition of the head tissue, and an equivalent tissue solution with the same average atomic number is prepared with water as a matrix; geometric shape equivalence is achieved, a geometric efficiency function of a cylindrical detector for a spherical source is constructed based on a spherical-cylindrical detector geometric efficiency calculation model; the equivalent spherical radius is determined, the simulation geometric efficiency of the head phantom-detector system is calculated through a Monte Carlo method, the geometric efficiency function is solved to be equal to the simulation geometric efficiency, and the equivalent spherical radius is obtained; the phantom is constructed, the equivalent tissue solution is used to fill a spherical container with a radius equal to the equivalent spherical radius, and a spherical head K-40 phantom is constructed. The application can simplify the construction process of the head K-40 physical phantom, reduce the calculation resource requirement of the head K-40 digital phantom, guarantee the simulation precision, and has high flexibility.

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.