47 results about "Real time dosimetry" patented technology

The invention discloses an automatic optimization method for an on-line self-adaption radiotherapy plan and a device. The method comprises the following steps: by reading an original radiotherapy plan and the information, such as acquired present gradation guide image and sketching target section, calculating a beam direction view of each frame angle, thereby acquiring the optimized newly generated sub-view and corresponding dose distribution, machine hop count and the like; finishing the on-line self-adaption automatic optimization of the radiotherapy plan; and meanwhile, performing secondary check on the dose distribution of the automatic radiotherapy plan through the calculation and assessment for a three-dimensional gamma index value; if failing to pass, performing normalization operation and updating the machine hop count of the new sub-view, thereby finishing the quality ensuring work. Furthermore, through the radiotherapy plan parameter transmission process check, the possibly present problem in a parameter transmitting and writing executing system is effectively avoided, and the safety monitoring is performed through real-time dosage detection during a plan executing process. The on-line self-adaption optimization of the radiotherapy plan, the quality ensuring and the full automation of parameter transmission check and real-time dosage detection are realized.

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 system for controlling and adjusting light in interstitial photodynamic light therapy (IPDT) in a subject is disclosed. More particularly, a method for controlling the light in interstitial tumor photodynamic light therapy is described using calculation method for determination of status of tissue during the PDT treatment. The status is used in a feedback loop to control the continued PDT treatment. Methods are disclosed that constitute pre-treatment and realtime dosimetry modules for IPDT on the whole prostate glandular tissue. The method includes reconstruction of the target geometry, optimization of source fiber positions within this geometry, monitoring of the light attenuation during the treatment procedure and updating individual fiber irradiation times to take into account any variation in tissue light transmission. A control device that is arranged to restrict delivery of therapeutic light treatment at least temporary in dependence of at least one attribute of one of photodynamic treatment parameters. In comparison to no treatment feedback, a significant undertreatment of the patient as well as damage to healthy organs at risk are avoided.

A radiation therapy treatment method comprises imaging a subject and simulating four-dimensional aspects of radiotherapy. A treatment plan based on the simulation is generated to permit real-time, three-dimensional dose reconstruction at the time of treatment. The simulation and treatment plan are used during treatment fractions to achieve real-time image guidance.

One embodiment of the present disclosure is directed to a mobile X-ray unit. The mobile X-ray unit may include a base for accommodating a control unit for controlling an X-ray applicator and a power supply for supplying power to the X-ray applicator. The mobile X-ray unit may further include an articulated arm associated with the base and coupled to the X-ray applicator. The X-ray applicator may have an X-ray tube configured to emit an X-ray beam through an exit window to irradiate an object. The mobile X-ray unit may further include a dosimetry system adapted for real time dosimetry.

A radiation therapy system (1) includes an ultrasound (US) imaging unit (2), a registration unit (30), an US motion unit (44), and a real-time dose computation engine (46). The ultrasound (US) imaging unit (2) generates a baseline and real-time US images (3) of a subject body (4) region including a target and one or more Organs At Risk (OARs). The registration unit (30) deformably registers a planning image (32) and the baseline US image (36), and maps (66) radiation absorptive properties of tissue in the planning image (32) to the baseline US image (36). The US motion unit (44) measures motion of the target volume and OARs during radiation therapy treatment based on the real-time US images. The real-time dose computation engine (46) computes a real-time radiation dose delivered to the tissues based on the tissue radiation absorptive properties mapped from the baseline or planning images to the real-time 3D US images (3).

The presently claimed and disclosed inventions relate, in general, to methods of radiation dosimetry and imaging using scintillation luminescence. More particularly, materials having a scintillation luminescence response to radiation that varies with total radiation dose received can be used for dosimetry monitoring, including, but not limited to nanoparticles for in vivo, real-time dosimetry. Energy-transfer nanocomposite materials as well as methods of making and using such materials in various applications including, but not limited to, in vivo radiation dosimetry and imaging, are disclosed. More particularly, the presently claimed and disclosed inventions relate to nanoparticle scintillation luminescence particles encapsulated in hosts of the general formula BaFX and BaFX:Eu2+ where X═Cl, Br and I.

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.

The present invention provides a method of determining the dose rate of a radiation source including locating three or more detectors in the vicinity of said source, each for providing an output indicative of the amount of radiation received from said source and determining the location of said source from at least some of said detector outputs, wherein as many of said detector outputs is required to provide an acceptably accurate result are used in determining said location whereby the dose of radiation from said source can be determined from said determined location of said source and either a known activity of said source or a measure of the activity of said source determined by said detectors.

One embodiment of the present disclosure is directed to a mobile X-ray unit. The mobile X-ray unit may include a base for accommodating a control unit for controlling an X-ray applicator and a power supply for supplying power to the X-ray applicator. The mobile X-ray unit may further include an articulated arm associated with the base and coupled to the X-ray applicator. The X-ray applicator may have an X-ray tube configured to emit an X-ray beam through an exit window to irradiate an object. The mobile X-ray unit may further include a dosimetry system adapted for real time dosimetry.

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.

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.

A distributed fiberoptic radiation sensor is described which may employ one or more radiation sensor elements distributed in a single optical fiber. Such optical fibers may be placed on surfaces, or even within parts, to unobtrusively measure radiation in precise and even difficult to reach locations. Different sensor elements may respond to different radiation types and wavelength ranges, with each sensor element causing a different wavelength of light to be emitted or absorbed within the fiber. By employing an appropriate combination of detection methods at the ends of the fiber, the distributed sensor may provide type and calorimetric discrimination of radiation incident on one or more distinguishable locations. The radiation information thus detected may be integrated, if desired, to obtain corresponding real-time dose information. With such integration, the device becomes a distributed real-time dosimeter. In another embodiment, the particular radiation sensors distributively employed may undergo permanent change in absorption characteristics. Such a device infers a total radiation dose over a particular period by measuring a change in optical response between the beginning and the end of the particular period.

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.

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.

The invention relates to a nuclear facility radiation field model construction method and a dose evaluation system, and the system is configured to establish a three-dimensional space coordinate system, construct a three-dimensional radiation field model based on radiation field data and radiation source data, and correct the radiation field model at the current moment according to the radiation source data, introducing an attenuation coefficient of the three-dimensional nuclear facility on the original three-dimensional scene model to correct the three-dimensional scene model; correcting the radiation field model based on the corrected three-dimensional scene model; calling the three-dimensional scene model and the radiation field model according to an operation path selected by a user; and simulating the space range of each organ of the human body sweeping along with the movement of the human body in the working path in the three-dimensional scene model, obtaining the time of each organ staying on the path of the unit space, and calculating the real-time dose received by the human organ according to the radiation dose rate in the unit space. According to the invention, the change of the radiation field caused by the disassembly and assembly of the nuclear facility can be corrected, and the optimization of radiation protection is realized.

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 discloses an electric power intelligent monitoring system based on multi-device cooperative linkage and an operation and maintenance method, and belongs to the technical field of electric power intelligent monitoring and operation and maintenance. Radiation data and historical decay records are collected through a sensor, a linear regression algorithm is adopted to fit and establish an energy spectrum purity attenuation model, and the dose loss proportion is calculated in real time; carrying out dynamic compensation on beam intensity and irradiation time based on the proportion, fusing real-time dose monitoring data by utilizing a Kalman filtering algorithm, and optimizing a beam intensity value to suppress noise interference; the irradiation time is further adjusted according to whether the dose loss exceeds a threshold value or not, and a dynamic compensation combination is formed; the effectiveness of the combination in each stage of the source life cycle is verified through the simulation module, and the verified compensation parameters are updated to the control system in real time, so that closed-loop regulation and control are realized. According to the invention, the whole process of dose output in the irradiation process is accurately and stably controlled, and the consistency and reliability of the irradiation process are remarkably improved.

The invention relates to the technical field of nuclear radiation detection and provides time sequence control logic and signal processing algorithm suitable for pulsed optically stimulated luminescence technique-based quasi-real-time dose rate measuring devices. The time sequence control logic provided by the invention has the beneficial effects that a same reference clock is adopted as a reference to generate input pulse signals of a laser, a shutter, a photomultiplier and a counter; and the precise time sequence control of the laser, the shutter, the photomultiplier and the counter can be realized by each pulse signal through setting the number of skipped reference pulses and the relative time delay relative to the reference clock. The signal processing algorithm provided by the invention has the beneficial effects that various dynamic and static backgrounds are considered; the relationship between cumulative dose and count value is given by linear fitting results of experimental data; the cumulative dose loss caused by each dose rate measurement is compensated; and therefore, the quasi-real-time dose rate can be accurately given.

The invention provides an electron irradiation dose real-time calibration management method and system, and relates to the technical field of data processing, and the method comprises the steps: collecting real-time dose original data at different positions, and carrying out the mapping processing of the real-time dose original data according to a transmission position and a time parameter, and forming a real-time dose matrix containing spatial distribution characteristics; comparing the dose value of each point location with a preset dose reference threshold value, and generating a dose deviation distribution diagram containing deviation magnitude and deviation position; identifying a local area of which the deviation exceeds a preset deviation threshold range, and generating abnormal dose batch information in combination with the product batch number; extracting a transmission speed parameter, a stacking thickness parameter and an irradiation power parameter of a corresponding batch of products to form a running state parameter set; executing hierarchical calibration processing; carrying out calibration verification processing; according to the invention, the autonomy and accuracy of real-time calibration of the electron irradiation dose are improved.

The invention discloses a three-dimensional in-vivo radiotherapy dose monitoring method and system, and the method comprises the steps: collecting an image sequence {In} containing time dimensions at a theta t time interval through CBCT scanning equipment in a radiotherapy process; calculating target area displacement of adjacent frames of images in the image sequence {In} by using a bidirectional optical flow estimation method; state estimation and prediction are carried out on the displacement data based on an adaptive Kalman filtering algorithm, a dynamic displacement rule of the target area in the respiratory cycle is generated, and a respiratory movement prediction result is output; acquiring radiotherapy plan parameters from a radiotherapy plan system, and calculating planned dose distribution without considering respiratory movement; dynamically adjusting a ray transmission path and energy deposition according to a respiratory movement prediction result, and calculating real-time dose distribution of each respiratory time phase; mapping the dose distribution of each time phase to a reference time phase coordinate system to generate accumulated dose distribution; and comparing and verifying the accumulated dose distribution and the planned dose distribution.

The invention provides a method and device using grating servo dosage rate, and radiotherapy equipment, and relates to the technical field of radiotherapy. The method using grating servo dosage rate provided by the invention comprises the steps of obtaining real-time dosage rate of an accelerator; according to the dosage rate measured at the last time, predicting the dosage rate of the current time with a kalman filter; and according to the predicted dosage rate, calculating the moving target of grating. The dosage rate of the accelerator is monitored in real time, and the operating speed of the grating is adjusted according to an algorithm, so that the grating movement can serve fluctuation of the dosage rate, the dosage illumination is more pinpoint, and the effect of precise radiotherapy is achieved.

An ultrasound probe includes an ultrasound probe housing (36) and one or more ultrasound transducers (32) disposed in the ultrasound probe housing. A dosimeter (40) or ionizing radiation detector is disposed in or attached to the ultrasound probe housing. An alarm device (24, 52, 54, 56) receives radiation dose or radiation exposure data acquired by the dosimeter or ionizing radiation detector. The alarm device includes an electronic processor (24, 56) programmed to detect excessive radiation dose or radiation exposure received by the ultrasound probe based on the radiation dose or radiation exposure data acquired by the dosimeter or ionizing radiation detector, and output an alarm warning of the detection of excessive radiation dose or radiation exposure received by the ultrasound probe.In some embodiments, the dosimeter is a one-time use dosimeter that is not resettable.

The present invention relates to a real-time dosimetry device for neutron capture treatments. The device comprises a first module (1) to absorb a flow of dispersed neutrons in a patient which impinge on the device. The first module (1) is made of a lightweight material such as high-density polyethylene, graphite, or a molecular compound, with lithium content. A second module comprises a first segmented gamma radiation detector (2) that is sensitive to radiation interaction positions therein, and a second segmented gamma radiation detector (3), which is also sensitive to the positions, the second gamma radiation detector (3) being detachably coupled to the first gamma radiation detector (2). The device is particularly suitable for real-time dosage monitoring in patients during boron neutron capture treatments (BNCT).

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.

The invention discloses a self-regulation source applicator system based on real-time dose feedback, which comprises a miniature dose sensing array, a signal acquisition module, a self-regulation module and a data control and feedback module, and is characterized in that the signal acquisition module is used for converting an analog signal of real-time dose data into a digital signal and transmitting the digital signal to the data control and feedback module; the data control and feedback module is internally provided with a main control unit, and the main control unit generates a comprehensive regulation and control instruction for the radioactive source based on a double-feedback mechanism of the dose deviation delta D and the space deviation delta X; or a comprehensive regulation and control instruction for the radioactive source is generated based on a single feedback mechanism of the dose deviation delta D; and the self-regulation and control module is used for accurately regulating the position, the moving distance and the residence time of the radioactive source in the source application channel according to a comprehensive regulation and control instruction sent by the main control unit in the data control and feedback module. According to the invention, real-time dose detection, data feedback and automatic regulation and control can be realized, and a dynamic closed-loop control mechanism of close-range radiotherapy is constructed.

The present application relates to the technical field of radiotherapy control, and discloses a treatment control method and system for AB-BNCT. The method comprises the following steps: sending a beam-out condition verification request and a beam-out safety verification request in response to a beam-out request; sending a beam-out button display instruction after receiving the pass results, so that the beam-out button is displayed based on a preset state; monitoring main real-time beam data in real time in response to a state change of the beam-out button; determining a main real-time neutron absorption dose based on the main real-time beam data; and sending a beam control instruction to an accelerator based on the main real-time neutron absorption dose and a target neutron absorption dose, so that the accelerator controls the beam in response to the beam control instruction. By comparing the real-time dose with the target dose, the treatment is continued or stopped, and the accuracy of the treatment and the safety of the patient are ensured. The present application solves the technical problems of low safety and dose verification lag in the existing AB-BNCT treatment, and improves the safety and efficiency of AB-BNCT treatment.

The invention relates to the technical field of radiation processing, and discloses a radiation processing control method and system based on the Internet of Things, and the method comprises the steps: converting an operation parameter signal of radiation equipment, deploying a sensor network, and collecting and preprocessing sensor data; a process parameter instruction set is obtained through process knowledge base matching and physical calculation; executing parameter setting and safety interlocking check, and then allowing beam outgoing; calculating a one-way absorbed dose and an accumulated absorbed dose, and performing parameter adjustment and irradiation control according to a calculation result; creating a unique batch traceability code and performing data association, generating an irradiation certificate, and obtaining irradiation batch data; a multi-objective optimization model is constructed, and a production scheduling plan is solved and generated; extracting equipment health characteristic parameters and evaluating health levels to obtain an equipment health evaluation report and a maintenance plan; according to the invention, through real-time dose monitoring and feedback control, process parameters are dynamically adjusted, so that the quality qualification rate of irradiation products is improved.