37 results about "Radiation therapy fields" patented technology

A method of reducing a total number of beam segments in a dose distribution for a radiation therapy field is provided. The method includes providing a multiobjective radiation therapy treatment plan using a suitably programmed computer, where the multiobjective radiation therapy treatment plan includes a radiation beam dose performance objective and a fluence map sparsity objective in a given fluence function domain, and providing a Pareto frontier of tradeoff criteria between the beam dose performance and a total number of radiation segments (or sub-fields) of the multiobjective radiation therapy treatment plan using the suitably programmed computer, where an achieved set of radiation beam dose distributions associated with efficiency points of the Pareto frontier are evaluated using a clinical acceptance criteria, where a clinically acceptable radiation beam dose distribution having a smallest number of the multileaf collimator segments is a final solution for the multiobjective radiation therapy treatment plan.

The invention discloses a positioning method and device, an upper computer and a radiotherapy system, and belongs to the field of radiotherapy. The positioning method comprises the steps that the positions, in an infrared coordinate system, of reference mark points arranged on a noninvasive positioning device are obtained; according to the positions of the reference mark points in the infrared coordinate system and the relative positions between reference mark points in an electronic scanning image and a designated image center point, the position of the image center point in the infrared coordinate system is determined; on the basis of the position of the image center point in the infrared coordinate system, the position of an isocenter point of radiotherapy equipment in a patient supporting device coordinate system, and the conversion relation between the infrared coordinate system and the patient supporting device coordinate system, the first offset amount between the image center point and the isocenter point in the patient supporting device coordinate system is determined; and in the patient supporting device coordinate system, the first offset amount is adjusted to the presetoffset amount by adjusting the position of a patient supporting device. The positioning method is low in cost, and a patient is not harmed.

The invention relates to a reconstruction and numerical value calibration method for a medical dual-energy computed-tomography (CT) electron density image. Reconstruction and numerical value calibration are carried out on a medical dual-energy-CT (DECT) electron density image according to a basal principle of base-material-decomposition DECT imaging as well as a linear relationship between combination of X-ray linear attenuation coefficients at a high energy level and a low energy level and a theoretical electron density value. When the method provided by the invention is applied to the tumor radiation therapy field for clinical application, the precision of target region positioning and accuracy of exposure dose calculation of a radiation therapy planning system can be improved.

The invention relates to a positioning and verification method for radiation therapy of tumors. The method consists of a radiation therapy field positioning method and a multileaf collimator shape verification method. The radiation therapy field positioning method comprises the following steps of (1) marking the position of a field center cross on the body surface of a patient; (2) making the center cross of the visual field of a camera in a positioning and verification device for radiation therapy of tumors and the therapy field central axis coincide; (3) showing the shooting field of the camera on a displayer in real time; (4) making the center cross of the visual field and the field center cross on the body surface of the patient coincide; and (5) completing the positioning, and making the camera return to the initial position on a guide rail. The multileaf collimator shape verification method comprises the following steps of: performing the steps of (1) to (4) in the radiation therapy field positioning method; (5) obtaining a corresponding ratio on the optical grating distance of a multileaf collimator; (6) displaying a radiation field shape or virtual multileaf collimator shape of the patient in the visual field of the camera, and making the center of the radiation field shape or virtual multileaf collimator shape of the camera coincide with the center of the visual field of the camera; (7) forming a heavy ion radiation field shape; and (8) completing the multileaf collimator shape verification. The method is simple and convenient.

The invention discloses a radiotherapy radiation field performance monitoring and adjusting device based on video, which belongs to the field of radiotherapy and comprises a video imaging system, a motion control system and a computer work station system. The video imaging system comprises a fluorescent screen covered with a metal plate, a video imaging system machine case, a video camera and a lighting device, wherein the video camera is positioned right in the center of the metal plate and the fluorescent screen, the position of the video camera is fixed, and the video camera is connected with the computer work station system through a universal series bus (USB) interference. The computer work station system comprises an image matching system and an adjusting guiding three-dimensional animation system. The motion control system is connected with the video imaging system. The radiotherapy radiation field performance monitoring and adjusting device based on video has the advantages of effectively resolving the problems that existing radiotherapy light field repeatability and centers of radiotherapy equipment and the like are difficult to detect and adjust quickly, and can quickly detect, guide and adjust in real time whether radiotherapy radiation field coincides lamp light field, and whether centers of radiotherapy equipment machinery and the like deviate.

The invention discloses a novel stereotactic radiotherapy system. The range of the incident angle of rays is enlarged, the focus-skin ratio and the dosage rate of a focal point are increased, weight loads of the two sides of a machine head are balanced, in this way, the rotating precision of the machine head is improved, and equipment abrasion is reduced. In the adopted technical scheme, a rotating roller is arranged on a base and can move circumferentially on the base along with the own center axis, a rotating disc sleeves a tray and can automatically rotate under the effect of a driving mechanism of the rotating disc, two treatment head racks are symmetrically arranged on the rotating disc, treatment heads are movably arranged at the lower ends of the treatment head racks respectively and arranged on the treatment head racks through adjusting structures, the adjusting structures are used for ensuring that the rays of the treatment heads are always gathered at the intersecting position of the center axis of the rotating roller and the automatic-rotation axis of the rotating disc, and the included angle formed between the rays of the treatment heads and the automatic-rotation axisof the rotating disc can be adjusted. The novel stereotactic radiotherapy system can be widely applied to the field of radiotherapy.

The invention belongs to the technical field of CT phantoms, and particularly relates to a phantom material suitable for CT standard value detection, a preparation method and application thereof. Withthe rapid development of medical imaging technology, the demand for customization and individualization in radiation therapy field becoms more and more obvious. The processing technology and means ofrapid design and manufacturing of phantoms are beneficial to manufacturing more flexible phantom products with individual adaptability. The invention provides a composition for preparing a phantom, which comprises agarose, calcium-containing inorganic salt, sodium chloride, magnesium chloride and a magnetic resonance contrast agent, and continuous change of CT values can be achieved by adjustingthe proportion of the calcium-containing inorganic salt in the raw material. In addition, the composition also has better dissolution effect in the process of preparing the phantom and can effectivelyshorten the preparation time of the phantom, the prepared phantom has more uniform density, has CT values and a relaxation time which are closer to viscera and muscles under certain proportions, andcan adapt to the detection of both CT and MRI.

The invention discloses a medical radiation device and belongs to the radiation therapy field. The medical radiation device includes an image acquisition device, an image processing device, a dose determining device, and an execution device; the image acquisition device is used for acquiring the image data of a radiation therapy object; the image processing device is used for determining a densitydistribution image and regions of interest according to the image data, wherein the regions of interest include a target region and an endangered organ region; the dose determining device is used fordetermining the dose of the radiation device based on the density distribution image and the regions of interest; and the execution device is used for performing treatment on the therapy object according to the dose. The medical radiation device provided by the invention can improve the efficiency and precision of radiation therapy.

The embodiment of the invention provides a dose rate intensity modulation method and device, computer equipment and a storage medium, and relates to the field of intensity modulated radiotherapy. In the embodiment of the invention, firstly, a current actual dose, a current target dose and a current pulse frequency are obtained, and the current pulse frequency is used for representing a dose rate of a radiation beam emitted by a radiation source device; then determining an output pulse frequency according to the current actual dose, the current target dose and the current pulse frequency; and finally, the dose rate of the radiation beam emitted by the radiation source equipment is updated according to the output pulse frequency. According to the embodiment of the invention, the output pulse frequency is determined based on the current actual dose, the current target dose and the current pulse frequency, and the dose rate of the radiation beam emitted by the radiation source equipment is updated so as to continue to irradiate the target region; the degree of deviation between the actual radiotherapy effect and the result specified by the treatment plan is within an acceptance range.

The invention relates to a method for monitoring an eye position coordinate based on an ocular electrical signal. The method analyzes an ocular electrical signal and extracts an eye movement signal, determines an eye state by analyzing the eye movement signal, and further determines an eye position coordinate, and after calculating the coordinate of the eye position, the visual damage feedback isgiven according to the real-time state of the eye and the distribution of radioactivity. The method does not require the device to be mounted directly on the eye, but instead places the electrodes onthe outside of the eye. By further studying the relationship between eye potential and eye movement, the corresponding features are extracted, the eye potential EOG can be used to accurately determinethe angle and direction of the eyeball rotation, and the eyeball can be accurately positioned. The method can be widely used in the detection of eye position during ocular radiotherapy in medical treatment, and prevents the occurrence of radiation therapy field near or even involving important functional organs such as visual organs.

The invention discloses a technical method for real-time image guidance. The achievement difficulty is small and the cost is low; synchronous real-time X-ray image guidance can be achieved in the process of radiation therapy, the precision of treatment is improved, a pulsed ray generator is selected, during MV level X-ray irradiation treatment, the ray generator of the kV level X-ray image guidingsystem works normally, X-rays are generated, a detecting plate works normally to generate an image P1, during the pulse interval period of the X-ray image guiding system, system control software controls a detection board to work normally, an image P2 is generated, subtraction operation is conduced on the image P1 obtained in the second step and the image P2 obtained in the third step to obtain an image P3 which is generated by X-ray effect generated by the X-ray image guiding system, a scatter line effect produced by the radiation treatment of a MV level ray is subtracted and removed, the image P3 can display normal anatomical information for image guiding operation of the radiation therapy, and the method can be widely applied in the field of the radiation therapy.

A respiration tracking apparatus (100) and a radiation therapy system, related to the field of radiation therapy. The respiration tracking apparatus (100) comprises: a respiration control module (110) that is connected to an analysis and comparison module (120) and is used for controlling an outputted respiratory flow and respiratory frequency, and for transmitting time trajectory coordinate values of a positional movement of a tumor and respiratory waveform and frequency of a patient to the analysis and comparison module (120); the analysis and comparison module (120) that is connected to a therapy control module (130), compares the respiratory waveform and frequency of the patient with respiratory waveform and frequency collected during planning and design, and, when the difference is less than or equal to a predetermined value, instructs the therapy control module (130) to control, on the basis of the time trajectory coordinate values of the positional movement of the tumor, a therapy apparatus (200) to conduct a therapy; and, the therapy control module (130) that controls, on the basis of the instruction of the analysis and comparison module (120), the therapy apparatus (200) to conduct the therapy. The respiration tracking apparatus (100) and the radiation therapy system are capable of tracking precisely and treating a tumor that moves in position due to respiration.