8 results about "Radiation therapy fields" patented technology

The utility model discloses a compact multi-directional symmetric achromatic beam transmission system, which belongs to the field of radiotherapy and solves the problem that the existing proton beam transmission line is not compact and flexible enough in layout. According to the utility model, an initial deflection secondary magnet, a four-stage magnet A, a four-stage magnet B, a four-stage magnet C, a deflection secondary magnet A, a four-stage magnet D, a four-stage magnet E and a deflection secondary magnet B are sequentially arranged along a proton beam direction; the initial deflection second-stage magnet, the fourth-stage magnet A, the fourth-stage magnet B, the fourth-stage magnet C and the deflection second-stage magnet A are arranged in an axial symmetry manner to form a symmetric achromatic structure; the initial deflection second-stage magnet, the fourth-stage magnet A, the fourth-stage magnet B, the fourth-stage magnet D, the fourth-stage magnet E and the deflection second-stage magnet B are arranged in a central symmetry mode to form an antisymmetric achromatic structure. According to the utility model, the beam dispersion is eliminated while the beam is deflected to the auxiliary transmission section, so that the deflected beam can meet the requirements of a treatment terminal without passing through the dispersion eliminating structure again.

The utility model relates to a phantom measuring device of a laser positioning system, and belongs to the field of radiotherapy. The measuring phantom device of the laser positioning system comprises a phantom body and a fixing frame used for fixing the phantom body on one side of a bed board. According to the invention, a new die body is used, so that the test efficiency is remarkably improved. The complexity and time consumption of manual operation are reduced, so that the test can be completed in a shorter time, and the risk of human errors is reduced; the repeatability and reliability of the test result are high, the long-term stability and consistency of the laser positioning system can be verified, and powerful support is provided for clinical treatment.

The application discloses a new actinium structure material obtained through first principle calculation and prediction, and belongs to the technical field of nuclear medical radiotherapy. The structure has an international symbol of Rm, a space group of 166, belongs to a trigonal system, a lattice constant of a=b=c=9.98371 Å, and a cell angle of α=β=γ=23.3174°. Ac1 is located at (0, 0, 0) in the cell, Ac2 is located at (0.77754, 0.77754, 0.77754), and Ac3 is located at (0.22246, 0.22246, 0.22246), thereby forming a layered hexagonal stacking structure. The structure has a low energy under normal pressure and is more stable than a traditional Fmm structure considered to be stable. Based on density functional theory calculation, the structure material has metallic properties, can be used for targeted alpha therapy, causes malignant cell death through alpha particle release, and has potential application value in the field of nuclear medical imaging and radiotherapy.

The invention provides a body surface respiratory movement tracking system and method based on a position sensing mark, which are used in the field of radiotherapy, and are characterized in that a visual mark generated based on a visual position sensing coding technology is arranged on clothes worn by a patient; detection and three-dimensional reconstruction of body surface marks are achieved through a binocular vision system to obtain body surface point clouds under respiratory movement, dimension reduction and fusion of body surface feature point clouds are achieved through PCA for the body surface point clouds at different moments, and body surface respiratory signals capable of being used for tumor movement tracking are extracted.

This application discloses a method for predicting bladder volume between and within radiotherapy fractions, belonging to the field of precision radiotherapy. The method includes: acquiring a sequence of fan-beam CT images of multiple completed treatment fractions for a patient, including pre-treatment images, pre-exit images, and post-exit images for each fraction; segmenting the images into bladder regions to construct a temporal volume dataset; determining the predicted bladder volume before the next treatment fraction using an inter-fraction prediction model; and determining the predicted bladder volume at a specified time point during the current treatment fraction using an intra-fraction dynamics model. The input to the inter-fraction prediction model includes at least one of volume sequence, water intake information, and extracted features; the input to the intra-fraction dynamics model includes at least one of the current pre-treatment bladder volume and daily water intake information. This application achieves dual-timescale prediction of bladder volume, providing a prospective decision-making basis for adaptive radiotherapy and improving the accuracy and safety of radiotherapy.

The present disclosure relates to the field of radiotherapy, in particular, methods of and apparatus for treating cancer using ultra-high dose rate radiotherapy (FLASH). The apparatus may comprise a device configured to administer to the subject no more than five fractions of proton ultra-high dose rate radiotherapy (FLASH), said fractions having a range of radiation from 1.5 Gy to 60 Gy, collectively. The device may be configured such that the treatment is sufficient to prevent further growth of the tumor for at least 10% longer than standard of care radiotherapy, induce at least 10% more tumor regression than standard of care radiotherapy and / or delay tumor regrowth by at least about 2 months longer than standard of care radiotherapy.

The utility model discloses a compact multipurpose proton beam system, belongs to the field of radiotherapy, and solves the problem that the existing proton beam system has a single treatment terminal type. The superconducting isochronous cyclotron system is connected to the two-way selection system through the beam adjusting system, the two-way selection system comprises a two-way dipole magnet and two branch selection systems, and the two branch selection systems are connected to the rear end of the two-way dipole magnet in parallel. The system also comprises a beam transport system, and the beam transport system is composed of a first treatment terminal section, a second treatment terminal section and a third treatment terminal section. One branch selection system is connected to the fixed experiment beam transport system through the first treatment terminal section, the other branch selection system is connected to the fixed pen-shaped beam transport system through the second treatment terminal section, the third treatment terminal section is a branch of the second treatment terminal section, and the third treatment terminal section is connected to the rotary beam transport system. According to the utility model, the bidirectional selection system design is utilized, and multi-type and multi-purpose treatment terminal beam irradiation is realized.

The invention relates to the field of medical image processing and radiotherapy, in particular to an intelligent delineation and dose optimization system for a gastrointestinal tumor radiotherapy target region, and solves the problems that traditional manual delineation of the target region is high in subjectivity, dose optimization is difficult to balance target region coverage and organ protection, accurate boundary control is lacked and the like. The system comprises a medical image acquisition module, a target region intelligent sketching module, a dose optimization module based on functional analysis and a treatment plan generation module, collects CT, MRI and PET multi-modal medical images of a patient, identifies tumors and organs at risk by using a machine learning algorithm, converts discrete data into continuous function representation in a Hilbert space, and generates a treatment plan according to the continuous function representation. A multi-objective optimization function is constructed, optimization is realized through variational iteration and adaptive weight adjustment, a Sobolev space regularization technology is used to control a dose gradient, an executable treatment plan is finally generated, and target region sketching accuracy and dose optimization quality are improved.