Abstract: The invention disclosed a dynamic intensity modulation method and device based on orthogonal double-layer grating rotation sweep. The method comprises: 1) obtain the fluence intensity distribution of each beam through the radiotherapy planning system; 2) the beam field is preliminarily divided into four quadrants, which is surrounded by four groups of leaves from the top, bottom, left and right, each quadrant corresponds to the beam intensity distribution in a region within the beam field range, and corresponds to a pair of mutually orthogonal leaves; 3) for the beam intensity distribution in any quadrant, two groups of orthogonal leaves are used for segmentation; 4) synchronize the monitor unit MU of each quadrant; 5) obtain the motion trajectory of active leaves in each quadrant, the motion trajectory of passive leaf in each quadrant and the overall monitor unit MU by calculation.

Abstract: A compensation method for bed surface drop before and after accelerator radiotherapy bed includes the following contents: the weight G is decomposed into N weights on average, the length L is decomposed into M positions on average, and then an experiment is carried out. The drop matrix HN×M of the couch top is measured by the experiment, by performing cubic spline interpolation on the rows of the matrix HN×M, and then performing cubic spline interpolation on the columns, the resulting cubic spline interpolation matrix SN×N1, M×M1 of HN×M has N*N1 rows and M*M1 columns, and then applies it to practice. The drop amount H obtained by the compensation method for bed surface drop before and after accelerator radiotherapy bed of the present invention is the optimal estimated value with the Least Sum of Square Error.

Abstract: The invention discloses an orthogonal dual-layer grating dynamic intensity modulation segmentation method based on quadrant, specifically include the following steps: S1: the fluence distribution under each beam is calculated through the radiation treatment planning system; S2: use orthogonal double-layer collimator for fluence segmentation; S3: divide the quadrant, divide the field surrounded by the upper, lower, left and right leaves into at least two quadrants, to obtain the fluence distribution and the corresponding leaf sequence of each quadrant; S4: perform regional planning of the fluence in each quadrant to obtain multiple different regions and determine the segmentation mode of different regions; S5: for any quadrant, use two mutually orthogonal leaf groups for segmentation.

Abstract: The invention provides an imaging method, a system and a radiotherapy device based on dual-energy CBCT. The method includes: rotating the large gantry by 90°, and obtaining the megavolt projection data from 0° to 90° and the kilovolt projection data from 90° to 180° in the process of rotation; using a predetermined reconstruction algorithm to reconstruct the megavolt projection data and the kilovolt projection data respectively to obtain the megavolt CBCT volume image and the kilovolt CBCT volume image; using the preset algorithm to obtain the corrected kilovolt projection data; using the preset algorithm to obtain corrected megavolt projection data; the corrected kilovolt projection data and the corrected megavolt projection data are used for hybrid reconstruction to obtain CBCT volume image. By using the kilovolt projection image and the megavolt projection image for hybrid reconstruction, CBCT volume image containing both soft tissue information and bone information are obtained.

Abstract: The present invention discloses an imaging device, method, and radiotherapy device for therapeutic energy spectrum CBCT. The device includes a double-layer detector and an image processing transmission device; the double-layer detector includes an upper layer detector and a lower layer detector; X-rays pass through the upper detector and are projected onto the lower detector; the upper detector is used to sense low energy X-rays and the lower detector is used to sense high energy X-rays. The image processing transmission device includes a first image processing transmission device and a second image processing transmission device. The first image processing transmission device corresponds to the upper detector and is used to process and transmit the sensing signal of the upper detector, while the second image processing transmission device corresponds to the lower detector and is used to process and transmit the sensing signal of the lower detector.

Abstract: The invention provides a method and device for IMAT using orthogonal double layer multi leaves collimators. The method includes: discretizing the rotating arc into multiple equally spaced fields; using the conjugate gradient method to calculate the field intensity matrix; using the double-layer grating static segmentation algorithm to calculate the subfields of each field to obtain the first predetermined number of subfields with the largest contribution to the field of each field; selecting two subfields with similar shapes from the first predetermined number of subfields with the largest contribution, distributing them to the arc of rotation, and performing interpolation to obtain discrete subfields; calculating deposition Matrix; iterative calculation of the shape and weight of subfield; using Monte Carlo dose algorithm to calculate the intensity-modulated dose distribution.

Abstract: The invention discloses a radiotherapy device and method, the invention uses the treatment reference point of the photon therapy component, that is, the isocenter as the reference point of the entire system, so that the axis of the proton beam emitted by the proton treatment equipment (proton therapy component) or the heavy ion beam emitted by the heavy ion treatment equipment (heavy ion therapy component) always passes through the reference point, then the two can simultaneously or separately treat patients who have successfully placed one time. The treatment plan can be optimized, and the respective treatment systems of the two treatment systems can be combined. Advantages, to complete the treatment together, especially for some complex cases, the combination of the two can better complete the treatment task at a lower cost.

Abstract: The invention discloses a dynamic intensity-modulated segmentation method for an orthogonal double-layer grating blade device. The core of the segmentation algorithm is to construct a virtual single-layer grating after the velocities of the two-layer gratings are synthesized to perform dynamic intensity modulation of the single-layer grating (sliding-window) segmentation, and finally use two layers of gratings to conform to each segment. In order to reduce the segmentation error, the invention provides two optimization methods: blade motion trajectory optimization method and segment weight optimization method. The blade motion trajectory optimization method is to optimize the objective function under certain constraints with the motion trajectory of each blade as a variable under the condition that the segment weight is fixed. Segment weight optimization method is to optimize the time points of each segment when the blade motion trajectory is fixed.

Abstract: The invention discloses a grating device for radiotherapy equipment. A tail-end position controller and a front-end position controller are simultaneously arranged, and can simultaneously verify a tail-end position and a middle position of each single grating blade and measure the time during which one grating blade arrives at the middle position from the tail-end position and/or the total number of revolutions of a motor at any time.

Abstract: The invention discloses a base for a novel accelerator therapy device. A boat-shaped rocker arm is creatively utilized to drive a main frame to rotate around an X axis, and meanwhile an accelerator simultaneously follows the main frame to rotate around a Z axis, so that the accelerator runs on a spherical surface and irradiates an isocentric lesion in any direction of a three-dimensional spherical space; the center of gravity of the boat-shaped rocker arm is low, the boat-shaped rocker arm bears weight on the curved surface, and a rotating shaft and an upright post for bearing the weight of the main frame and the weight of the accelerator in the prior art are removed, so that the base is high in stability, safe, reliable and low in requirement for transmission equipment and easily realizes industrialized application.

Abstract: The present invention discloses a homologous dual-energy accelerator and a therapy device comprising the homologous accelerator. The homologous dual-energy accelerator comprises an electron emitting device and an accelerating device, wherein the electron emitting device is located at the input end of the accelerating device, and electrons generated by the electron emitting device are emitted from the output end of the accelerating device after being accelerated by the accelerating device; the homologous dual-energy accelerator further comprises at least one separation deflection device which is arranged on the output end side of the accelerating device and used for changing the motion trail of partial electrons among the electrons accelerated by the accelerating device.

Abstract: The invention discloses a radiation field control device and radiotherapy equipment. Two or more different-sized light limiting barrels are directly machined on a light limiting barrel support, or two or more light limiting barrel mounting portions are arranged on the light limiting barrel support, then the two or more light limiting barrels are respectively mounted in the light limiting barrel mounting portions in a one-to-one correspondence manner, any one of the light limiting barrels can move to a working position through a light limiting barrel switching device, in this case, when the light limiting barrel having suitable size is required, the unsuitable light limiting barrel does not need to be detached, and the required light limiting barrel can be used conveniently and quickly by directly controlling the light limiting barrel switching device.

Abstract: The present invention discloses a homologous dual-energy accelerator and a therapy device comprising the homologous accelerator. The homologous dual-energy accelerator comprises an electron emitting device and an accelerating device, wherein the electron emitting device is located at the input end of the accelerating device, and electrons generated by the electron emitting device are emitted from the output end of the accelerating device after being accelerated by the accelerating device; the homologous dual-energy accelerator further comprises at least one separation deflection device which is arranged on the output end side of the accelerating device and used for changing the motion trail of partial electrons among the electrons accelerated by the accelerating device.

Abstract: The invention discloses a base for a novel accelerator therapy device. A boat-shaped rocker arm is creatively utilized to drive a main frame to rotate around an X axis, and meanwhile an accelerator simultaneously follows the main frame to rotate around a Z axis, so that the accelerator runs on a spherical surface and irradiates an isocentric lesion in any direction of a three-dimensional spherical space; the center of gravity of the boat-shaped rocker arm is low, the boat-shaped rocker arm bears weight on the curved surface, and a rotating shaft and an upright post for bearing the weight of the main frame and the weight of the accelerator in the prior art are removed, so that the base is high in stability, safe, reliable and low in requirement for transmission equipment and easily realizes industrialized application.

Abstract: The invention discloses a grating device for radiotherapy equipment. A tail-end position controller and a front-end position controller are simultaneously arranged, and can simultaneously verify a tail-end position and a middle position of each single grating blade and measure the time during which one grating blade arrives at the middle position from the tail-end position and/or the total number of revolutions of a motor at any time.

Abstract: The invention discloses a radiation field control device and radiotherapy equipment. Two or more different-sized light limiting barrels are directly machined on a light limiting barrel support, or two or more light limiting barrel mounting portions are arranged on the light limiting barrel support, then the two or more light limiting barrels are respectively mounted in the light limiting barrel mounting portions in a one-to-one correspondence manner, any one of the light limiting barrels can move to a working position through a light limiting barrel switching device, in this case, when the light limiting barrel having suitable size is required, the unsuitable light limiting barrel does not need to be detached, and the required light limiting barrel can be used conveniently and quickly by directly controlling the light limiting barrel switching device.

Abstract: A system and a method are provided for intensity modulated radiation treatment. A field on a patient (544) for irradiation is first defined. A beam of radiation (530) is then provided. This beam (530) passing through an opening defined by a beam-shielding device (540, 542). In the preferred embodiment, the beam shielding device is a single jaw (540) and a single collimator section (542). Single jaw (540) and single collimator section (542) are moved in one direction at different velocities to vary the opening for radiation beam (530).

Abstract: An ionization chamber for monitoring a radiation beam includes a housing having a primary beam passageway and a number of secondary beam cells that are adjacent to the primary beam passageway. The primary beam passageway passes entirely through the housing. In the preferred embodiment, a large-area beam measuring electrode and an array of small-area beam measuring electrodes are each coaxial with the primary beam passageway. Also, in the preferred embodiment, each secondary beam cell includes a beam measuring electrode. Because the portions of the radiation beam that enter the secondary beam cells do not pass through the ionization chamber, these portions do not contaminate the treatment beam, allowing the beam measuring electrodes within the cells to be dimensioned and configured so as to maximize signal strength.