11 results about "Multileaf collimator" patented technology

The application discloses a kind of double-layer multileaf collimator leaf amplification factor adjustment methods, comprising: the grating blade stroke is segmented according to preset interval;Respectively, the upper grating and the lower grating are independently calibrated, the equal center plane field width of each segmented point is measured, and the amplification factor is calculated;For the segmented point that cannot be directly measured, segmented linear interpolation is used to complete;Amplification factor is written into control system and the whole stroke accuracy is verified through multi-field strip field.The application fits the nonlinear characteristics of single-focusing grating amplification factor by segmented measurement, adapts to the difference of double-layer structure by independent calibration of upper and lower layers, realizes full-stroke coverage by interpolation completion, and finally improves the positioning accuracy of field boundary, significantly improves the accuracy and safety of radiotherapy.

A mount for an array of leaf drive units corresponding to individual leaf banks of a multi-leaf collimator, the mount comprising: a plurality of separable mounting plates. Each mounting plate comprises an array of mounting holes, each mounting hole arranged to receive a respective one of the leaf drive units.

The present invention relates to a multileaf collimator and a radiotherapy machine comprising the same. A multilayer multileaf collimator (MLC) includes an outboard shielding member that spans or extends across a treatment field from a guide feature in a first leaf bank to a matching guide feature in an opposing second leaf bank. Unlike pairs of beam blocking leaves that extend to a central portion of the treatment field, each outboard shielding member extends across the treatment field from within an outer edge of one leaf bank to a corresponding outer edge of the opposing leaf bank.

A radiation delivery system includes a radiation source to generate a radiation beam for delivery to a target and a multileaf collimator (MLC) operably coupled to the radiation source, the multileaf collimator being offset such that the multileaf collimator is displaced in a direction relative to a line from the radiation source to a point of interest, causing a projection of the radiation beam to be displaced based on the offset.

The utility model relates to a quick unloading device with orientation positioning relates to the field of radiotherapy technology. The utility model discloses a quick unloading device with orientation positioning, including base, guide slide and mounting seat, and mounting seat can be freely moved in the guide slide in the base according to the predetermined direction through the rolling support structure, simultaneously makes the light beam processing module on its after inserting the mounting seat in the base and the center of collimator and multileaf collimator on both sides of the base fast alignment, therefore can realize the quick positioning installation of light beam processing module in the limited space range defined by the base, satisfies the test and operation and maintenance demand of light beam processing module, especially applicable to the quick unloading scene of the system component early stage free introduction, late period guide and lock in place.

The utility model relates to a kind of test tool of accelerator multileaf collimator driving board, including multileaf collimator test board, control unit and adjustable power module, control unit connects multileaf collimator test board, multileaf collimator test board is also communicatively connected accelerator multileaf collimator driving board, adjustable power module is respectively powered for multileaf collimator test board and control unit;Multileaf collimator test board includes signal interface matching circuit, protection circuit, data acquisition module and communication module, signal interface matching circuit connects accelerator multileaf collimator driving board, data acquisition module is respectively connected signal interface matching circuit and communication module, communication module connects control unit, adjustable power module is connected data acquisition module through protection circuit.Compared with prior art, the utility model provides the hardware foundation for the test of accelerator multileaf collimator driving board, can cooperate the development of subsequent test procedure significantly improve the research and development and production efficiency of MLC driving board, and safe and reliable.

The invention discloses an MLC controller based on a hardware PID algorithm and a control method thereof, the MLC controller comprises an FPGA control module, the FPGA control module integration comprises a parallel hardware PID controller array, the parallel hardware PID controller array is composed of N independent hardware PID controllers, each hardware PID controller correspondingly controls one leaf of a multi-leaf collimator, N is a positive integer greater than 1, and the FPGA control module integration comprises an FPGA control module, the encoder interface array is used for reading position encoder data of N blades of the multi-blade collimator in parallel and sending the position encoder data to the corresponding hardware PID controllers; the PWM signal generation module array is used for generating N paths of PWM signals to drive corresponding blade motors according to the control signals output by the parallel hardware PID controller array; the data cache analysis module is used for receiving a target track instruction of an upper computer and sending a parameter instruction to the parallel hardware PID controller array; wherein each hardware PID controller in the parallel hardware PID controller array independently runs in parallel based on a global clock signal.

A system for delivering radiation dose, includes a gantry to move about a target to be irradiated and a radiation source mounted to the gantry and directed inward toward the target, The system further includes a collimator mounted to the gantry and in front of the radiation source, the collimator to shape a radiation beam directed at the target, wherein the collimator is to modulate a sub-beam intensity of the radiation beam across a plurality of sub-beams that subdivide a fluence field into a two-dimensional (2D) grid, and wherein a plurality of independent two-dimensional (2D) sub-beam intensity patterns are delivered from a plurality of gantry angles while the gantry moves continuously.

The present disclosure provides systems and methods for dynamic multileaf collimator (MLC) tracking. A method may include identifying a plurality of working leaves of the MLC at a control point; determining, for the control point, a signal acquisition region of an electronic portal imaging device (EPID) based on a plurality of planned position trajectories of the plurality of working leaves, wherein the signal acquisition region is part of an imaging plane of the EPID and includes a plurality of acquisition rows; and obtaining an image from the EPID at the control point, wherein the image includes information acquired in the signal acquisition region.

The application discloses a kind of dynamic multileaf collimator blade control method and system based on cooperative control, belong to radiotherapy technical field.Method first through first irradiation mode, in effective dose area boundary, preset buffer zone is contracted inward, demarcate retracted safe irradiation range, realize the large-scale uniform irradiation of basic dose;Subsequently in second irradiation mode, based on continuity constraint dynamic selection reference line, to reference behavior benchmark combination adjacent line movement constraint cooperative decision all leaf position, so that each line complete time is similar, position is similar, reduce the number of sub-field;Through morphing registration technology, realize the accurate accumulation of dose on dynamic anatomical structure;And introduce adaptive JAW control shielding mask-free area and completed line.The application improves the precision and efficiency of dynamic target area irradiation significantly through double mode cooperation, reference line cooperative control and adaptive JAW cooperation, effectively reduces over-irradiation and under-irradiation, while ensuring the safety of treatment process.

A blade transmission mechanism of a multi-leaf grating for tumor intensity modulated radiation therapy comprises a mounting plate, supporting rods which extend upwards are symmetrically arranged at the top of the mounting plate, fixing rings which are mutually connected through connecting rods are arranged between the supporting rods at intervals, rotating columns which are rotationally connected are arranged on the fixing rings, and gratings which are connected through rotating rods are arranged on the rotating columns at intervals. A connecting plate is arranged on the side face of the supporting rod, a motor is arranged on the connecting plate, sliding rods are symmetrically arranged on the supporting rod, and racks in sliding connection are arranged on the sliding rods; the utility model has a simple and reasonable structure, and can effectively and quickly open and close the grating, thereby reducing the time of radiotherapy light irradiation on the body of a patient.