31 results about "Real time dosimetry" patented technology

A system for radiation therapy including a radiation planning system, wherein the radiation planning system comprises a parallel processor adapted to receive input information concerning a body having an intended radiation treatment region and to output information for providing radiation treatment to the intended radiation treatment region of the body, wherein the parallel processor is adapted to perform a plurality of reverse ray tracing calculations based on the input information concerning the body in determining the output information for providing radiation treatment, each of the plurality of reverse ray tracing calculations comprising: calculating a first physical property corresponding to a first sub-region of the intended radiation treatment region of the body that is intersected by a ray traced between a source position and the intended radiation treatment region; and calculating, subsequent to the first-mentioned calculating, a second physical property corresponding to a second sub-region of the intended radiation treatment region that is intersected by the ray at a location closer to the source position than is the first sub-region.

A method and an apparatus for dose-guided radiotherapy for a patient (P) having an identified radiotherapy target utilizes a radiation detecting array (R) of radiation-sensitive dosimeters for the real-time remote measurement of radiotherapy at the radiation detecting array (R). The radiation detecting array is positioned within the patient's (P) body along the treatment path before or after the identified radiotherapy target or the device may be positioned beyond the patient (P) to measure transit dose. A radiation source (A) for emitting radiation for radiotherapy along a treatment path through the patient (P) to the identified radiotherapy target is utilized. The method includes generating a predicted dose pattern of radiation at the placed radiation detecting array (R). The predicted dose pattern assumes an on-target radiation source (A) emitting the radiotherapy beam along the treatment path through the patient (P) to the identified radiotherapy target. Gating of the radiation source (A) can occur responsive to the comparing of the predicted dose pattern of radiation to the real-time dose pattern at the radiation detecting array (R). Radiation intensity can vary between low levels to a treatment level responsive to coincidence of the predicted dose pattern of radiation to the real-time dose pattern at the radiation detecting array (R).

A method of determining the dose rate of a radiation source includes locating three or more detectors in the vicinity of the source. Each detector provides an output indicative of the amount of radiation received from the source and determining the location of the source from at least three of the detector outputs, wherein as many of the detector outputs is required to provide an acceptably accurate result are used in determining the location. Thus, the dose of radiation from the source can be determined from the determined location of the source and either a known activity of the source or a measure of the activity of the source determined by means of the detectors.

A method of determining the dose rate of a radiation source includes locating three or more detectors in the vicinity of the source. Each detector provides an output indicative of the amount of radiation received from the source and determining the location of the source from at least three of the detector outputs, wherein as many of the detector outputs is required to provide an acceptably accurate result are used in determining the location. Thus, the dose of radiation from the source can be determined from the determined location of the source and either a known activity of the source or a measure of the activity of the source determined by means of the detectors.

Real-Time Dosimetry System, RTDS, is dose measurement system consisting of an ionization chamber and electrometer with the ability to measure, record, and display the high radiation doses required to meet approved standards for sterilization of medical, industrial and food products.

The invention provides a method, device and radiotherapy equipment using grating servo dose rate, and relates to the technical field of radiotherapy. The grating servo dose rate method provided by the present invention includes: obtaining the real-time dose rate of the accelerator; using the Kalman filter to predict the dose rate at the current moment according to the dose rate measured at the previous moment; and calculating the motion of the grating according to the predicted dose rate Target. By monitoring the dose rate of the accelerator in real time, the operating speed of the grating is adjusted according to the algorithm, so that the motion of the grating can servo the fluctuation of the dose rate, making the dose irradiation more accurate and achieving the effect of precise radiotherapy.

A radiation therapy system (1), comprising: an ultrasound (US) imaging unit (2), a registration unit (30), a US motion unit (44), and a real-time dose calculation engine (46). The ultrasound (US) imaging unit (2) generates baseline and real-time US images (3) of a region of a subject's body (4) including a target and one or more organs at risk (OAR). The registration unit (30) deformably registers a planning image (32) with the baseline US image (36), and maps (66) radiation absorption properties of tissue in the planning image (32) to the Baseline US images as described (36). The US motion unit (44) measures motion of the target volume and OAR during a radiation therapy treatment based on the real-time US images. The real-time dose calculation engine (46) calculates a real-time radiation dose delivered to the tissue based on the tissue radiation absorption properties mapped from the baseline or planning image to the real-time 3D US image (3).

Embodiments of the present disclosure provide improved techniques for dosimetry in radiotherapy treatment. In a fractionated radiotherapy treatment, once the first fraction is complete and has been verified, data is generated which is representative of the dose development during delivery of the treatment for that patient and that treatment plan. This data can be used as a comparator for the instantaneous doses observed during subsequent fractions, allowing real-time dosimetry verification for the second and subsequent fractions after a successful first fraction.

The invention relates to a high radiation dose measurement method and system. The method comprises: after receiving a reading instruction, collecting visible fluorescence data generated by a Th-SINAP crystal dose tablet excited by ultraviolet rays; screening and eliminating visible fluorescence data by using ultraviolet rays as excitation For the part affected by the light source, the actual visible fluorescence data is obtained; according to the actual visible fluorescence data, the corresponding dose value is read on the relationship curve between the visible fluorescence data and the dose determined by the calibration experiment, and the real-time dose rate is calculated. The invention uses ultraviolet to excite fluorescence and measures the radiation dose by collecting the fluorescence color. By eliminating the part of the visible fluorescence data that is affected by using ultraviolet as the excitation light source, it solves the problem of measuring high radiation dose (Gy / h-MGy / h amount in the traditional technology) The problems of long acquisition time of dose data, complicated data acquisition steps and inaccurate reading of dose values ​​existed in the case of high level).

The invention provides a voxel-based body external irradiation dose simulation method. According to the method, 3dsMax software is used to establish a virtual human model with a skeleton animation; dose distribution data in a virtual nuclear radiation field is initialized; according to a body structure and a skeleton structure of a virtual human, a body voxel model is established; body modules areallocated, and weights of all the modules and a body effective dose calculation formula are defined; an interpolation method is utilized to calculate an instant exposure dose rate and an accumulateddose of the virtual human; a body exposure dose is calculated based on the skeleton animation; and all the modules perform parallel calculation. Through the method, voxelization is not directly performed on a three-dimensional model of the virtual human, the steps are easier and more convenient, the voxel model can move along with human skeletons, and real-time dose evaluation is realized.

An ultrasonic probe comprising: an ultrasonic probe housing (36); one or more ultrasonic transducers (32) disposed in the ultrasonic probe housing; a dosimeter (40) or an ionizing radiation detector, which disposed in or attached to the ultrasound probe housing; an alarm device (24, 52, 54, 56) that receives radiation dose collected by the dosimeter or ionizing radiation detector or radiation exposure data, the alarm device includes an electronic processor (24, 56) programmed to detect excessive radiation dose or radiation exposure received by the ultrasound probe, and outputting an alarm warning of detection of excessive radiation dose or radiation exposure received by the ultrasound probe. In some embodiments, the dosimeter is a non-resettable single-use dosimeter.