107 results about "Isocenter" patented technology

An electronic device for processing a blood vessel image according to an embodiment may include: an arc-shaped C-arm open toward the isocenter; a radiation source connected to the C-arm and emitting radiation to a target blood vessel located on a table; and a processor for computing a target distance from the radiation source to the target blood vessel, on the basis of a first vertical distance from the isocenter to the table and a second vertical distance from the target blood vessel to the table, and computing a physical distance of the target blood vessel by using the computed target distance, from a blood vessel image obtained using radiation.

The invention relates to a method for reconstructing a 3D medical image of a region of interest from a set of 2D X-ray images acquired by an X-ray imaging system comprising an X-ray source(S) and an image detector (D), comprising the steps of: —computing n paths of the X-ray imaging system, n being an integer greater than or equal to 2, said paths being adapted to acquire n respective subsets of 2D X-ray images together forming the set of 2D X-ray images, each image (IA, IB, IC) of a subset defining a respective cone of projection (CA, CB, CC) of the region of interest onto the image detector, such that, for a same position of the X-ray source(S) along the n paths, the cone of projection of an image of any subset is contiguous to the cone of projection of an image of at least one other subset, wherein computing said n paths comprises: —placing a virtual isocenter (O) of the X-ray imaging system at a given position or set of positions relative to a center (C) of the region of interest, and —defining, for each position of the X-ray source along the n paths, the n cones of projection such that the center of a height of an enlarged cone formed by the union of the n cones of projection is said virtual isocenter (O): —implementing the computed n paths to acquire the n subsets of images: —reconstructing the 3D medical image by intersecting the cones of projection defined by each image of the n subsets.

The present disclosure provides systems and methods for automated scan preparation and real-time monitoring / adjustment in medical imaging. The automated scan preparation may include positioning a target subject to be scanned by a medical imaging device, determining a rotation scheme of the medical imaging device, targeting a scan region of the target subject with an imaging isocenter of the medical imaging device, determining target position(s) of component(s) of the medical imaging device, performing a virtual scan, generating a reference subject model representing an internal structure of the target subject, or the like. The real-time monitoring / adjustment operations may include achieving automatic brightness stabilization, monitoring a posture of the target subject, adjusting the position of component(s) of the medical imaging device, estimating a dose distribution, monitoring a treatment of the target subject, performing a motion correction, or the like.

The invention discloses an optical body surface monitoring method and device applied to a radiotherapy room system and a medium, and relates to the technical field of optical body surface monitoring, and the method comprises the steps: employing a checkerboard calibration algorithm, and determining a positioning external parameter and a treatment external parameter; performing positioning monitoring on the user according to the positioning reference body surface, the body surface positioning real-time point cloud of the user under multiple visual angles and the positioning external parameters of each camera in the positioning camera group, and moving the treatment bed until the body surface positioning mark point of the user is aligned with the positioning isocenter of the radiotherapy machine; performing radiotherapy image verification monitoring on the user according to the treatment reference body surface, the first body surface treatment real-time point cloud and the treatment external reference, and moving the treatment bed until the body surface positioning mark point of the user is aligned with the treatment center of the radiotherapy machine; and performing treatment monitoring on the user in the beam treatment process according to the second body surface treatment real-time point cloud and the treatment external reference, and determining a treatment real-time error. The optical body surface monitoring can be completed based on the annular structure radiotherapy machine by determining the positioning external reference and the treatment external reference.

The invention discloses an isocenter calibration quality control system and method for a radiotherapy image guidance system, and relates to the technical field of medical image processing, and the method comprises the steps: S1, enabling radiotherapy rays to be imaged on a scintillator through an optical body surface imaging mode, and obtaining the radiation isocenter of a linear accelerator according to the imaging information of the scintillator; s2, calculating a 3D point cloud of the ball array by using an image processing module to obtain a 3D coordinate of the center position of the ball array; and S3, aligning the 3D coordinate of the center position of the ball array with the radiation isocenter of the linear accelerator to realize calibration of a point cloud coordinate system so as to accurately position the patient in a positioning and treatment stage. According to the invention, the isocenter position of the accelerator can be accurately positioned, the isocenter point of the accelerator is mapped to the point cloud three-dimensional space coordinate for coordinate alignment, accurate positioning and calibration of the system are realized, and the system can also be used for positioning verification before radiotherapy.

The present application relates to a radiotherapy apparatus for delivering radiation to a subject. The apparatus comprises a source of radiation configured to rotate about an isocenter and emit radiation in a radiation plane containing said isocentre. The apparatus also comprises a subject support surface including a portion configured to be located substantially at the isocenter. The subject support surface comprises a subject support surface rotation mechanism configured to rotate the subject support surface about an axis of rotation parallel to and spaced from an axis that passes through the isocenter. The subject support surface also comprises a first section configured to move from a first position to a second position along at least one of a longitudinal and lateral direction. The apparatus also comprises a processor configured to control the longitudinal and / or lateral movement of the first section as a function of the rotation of the subject support surface to maintain the portion of the subject support surface substantially at the isocenter.

The present disclosure provides systems and methods for automated scan preparation and real-time monitoring / adjustment in medical imaging. The automated scan preparation may include positioning a target subject to be scanned by a medical imaging device, determining a rotation scheme of the medical imaging device, targeting a scan region of the target subject with an imaging isocenter of the medical imaging device, determining target position(s) of component(s) of the medical imaging device, performing a virtual scan, generating a reference subject model representing an internal structure of the target subject, or the like. The real-time monitoring / adjustment operations may include achieving automatic brightness stabilization, monitoring a posture of the target subject, adjusting the position of component(s) of the medical imaging device, estimating a dose distribution, monitoring a treatment of the target subject, performing a motion correction, or the like.

The present disclosure relates to a target volume tracking method and a computer device. The method includes: determining an isocenter location corresponding to the target volume in a scout image of an object, and obtaining the spatial position of the treatment head in the radiotherapy device, and then determining the at least one slice on the scout image based on the isocenter location and the spatial position, so as to control the magnetic resonance scanner to radiate a RF pulse which excites the at least one slice to obtain a tracking image of the object; the tracking image includes the target volume.

The invention discloses a radiotherapy equipment image guiding device and method and related equipment, and relates to the technical field of radiotherapy, and the device comprises a ray generation module which is provided with a ray source and is arranged at one side of a treatment room isocenter; the radiation source is used for moving along a first preset path; the ray source is used for emitting rays, and the rays penetrate through a patient; the detection and acquisition module is provided with a detector, is arranged on the other side of the isocenter of the treatment room and is distributed opposite to the ray source along the isocenter; the detector is used for moving along a second preset path, collecting rays penetrating through the patient and converting the rays into corresponding projection images; the registration module is used for performing registration on the projection image and a planned CT image by executing a first registration mode or a second registration mode so as to calculate a positioning deviation; and the first preset path and the second preset path are straight lines, so that the adaptability, precision and stability of radiotherapy are improved.

The invention provides an irradiation system, devices, and methods. The irradiation system includes a shielded housing; at least one canister disposed within the shielded housing, the at least one canister containing a material for irradiation within an interior volume of the at least one canister; wherein the at least one canister has a body disposed between a first end cap disposed at a first end of the canister and a second end cap disposed at a second end of the canister opposed to the first end; an ionizing radiation source disposed within the shielded housing adapted for emitting an ionizing radiation having at least one selected incident irradiation field geometry directed generally at the body of the at least one canister; wherein at least one canister is disposed on a rotating mechanism for rotating the at least one canister about a central horizontal or longitudinal axis extending from an isocenter of the first end cap to an isocenter of the second end cap for increasing uniform distribution of radiation of the material contained within the canister.

The invention provides a robot treatment bed positioning error correction method. The method comprises three steps of coordinate system establishment and calibration, positioning error detection and calculation and error correction. A first reflection target ball is installed at an angular point of a treatment bed, a high-precision optical positioning system is used for obtaining coordinates of a radiotherapy isocenter point, and a conversion relation between a base coordinate system and an optical positioning system coordinate system is established. Controlling the treatment bed to move to four non-coplanar feature points, collecting actual coordinates, comparing the actual coordinates with theoretical coordinates, calculating an error matrix of a base coordinate system, solving a target pose matrix, driving the robot treatment bed to adjust the tail end pose, and realizing accurate alignment of a treatment center and an isocenter. The method can detect and automatically compensate systematic pose deviation caused by mechanical wear in real time, has the advantages of high precision, high automation degree, correction from an error source and the like, and effectively guarantees long-term positioning precision and clinical safety of a radiotherapy system.

The present disclosure provides a cone beam computed tomography system for proton therapy comprising an x-ray source configured to generate x-rays and positioned to rotate around a patient at a treatment isocenter, a detector assembly positioned opposite the x-ray source and configured to receive x-rays that have passed through the patient, a rotation mechanism configured to rotate the x-ray source and the detector assembly around the patient while maintaining their relative positions, a translation mechanism configured to translate at least one of the x-ray source, the detector assembly, or a patient couch during rotation to implement a wobbled scan orbit, and a scatter rejection grid attached to the detector assembly and focused on the x-ray source to reduce scattered x-rays. The translation mechanism distributes missing projection data across multiple radii and angles, enabling improved reconstruction quality through iterative reconstruction methods.

The present application relates to a radiotherapy apparatus for delivering radiation to a subject. The apparatus comprises a source of radiation configured to rotate about an isocenter and emit radiation in a radiation plane containing said isocentre. The apparatus also comprises a subject support surface configured such that a portion of the subject support surface can be located substantially at the isocenter. The apparatus also comprises a subject support surface rotation mechanism configured to rotate the subject support surface about an axis of rotation that passes through the isocenter, wherein the subject support surface rotation mechanism is located outside the radiation plane.

The invention provides a particle radiotherapy isocenter determination method, a debugging method and a related device, and relates to the technical field of particle radiotherapy, and the particle radiotherapy isocenter determination method comprises the steps: obtaining the range of the mechanical isocenter of a rack and a treatment head through an electronic theodolite and a first test tool installed on the treatment head; according to the determined range of the mechanical isocenter of the rack and the treatment head, utilizing a two-dimensional image system at a fixed position to respectively collect images of the circular geometry on the first test tool on the treatment head in two intersecting directions when the treatment head is in a horizontal position, so as to obtain two two-dimensional images; the cross curve of the two-dimensional image system is adjusted, so that the cross point of the cross curve is aligned with the center of the circular geometry on the isocenter test tool, and the mechanical isocenter of the rack and the treatment head is determined; the actual mechanical isocenter of a treatment room is accurately determined through special equipment and tools, and accurate particle radiotherapy is achieved.

This invention relates to a method for measuring the rotational accuracy of a rotating gantry, comprising: mounting a laser generator on a treatment head; mounting a calibration device on a treatment bed, the calibration device having a preset part; moving the treatment bed so that the preset part of the calibration device is located at the isocenter point of the rotating gantry; aligning the laser emitted by the laser generator on the treatment head with the preset part of the calibration device on the treatment bed; rotating the treatment head 180 degrees from its starting point and then back to its starting point, observing the positional relationship between the laser and the preset part during the rotation; and obtaining the rotational accuracy based on the positional relationship between the laser and the preset part. This method for measuring the rotational accuracy of a rotating gantry, through the positional relationship between the laser emitted by the laser generator and the preset part of the calibration device, can quickly measure the rotational accuracy of the rotating gantry, is simple to operate, and has a short measurement time.

Methods and systems for positioning and positioning a patient for irradiation therapy without fiducial markers. Platform settings including parameters of the patient support platform are obtained. Platform position data is obtained in which a patient is placed on a platform for imaging without fiducial markers, the platform position data including 3D coordinates of the platform relative to an imager coordinate system calibrated to a predefined fixed set of initialized coordinates in a treatment room. Target tissue is imaged with the patient on the platform. A treatment plan is generated based on the target tissue imaging. The treatment plan comprises a treatment radiation field of a treatment angle, and the treatment angle comprises a platform positioning parameter. When treatment is initiated, the patient is placed on the platform without fiducial markers according to the platform settings. In accordance with the treatment plan, the platform position data, and a coordinate system transformation of the imager coordinate system to the treatment room coordinate system, the platform is adjusted to position the patient at the placement position in the treatment room such that the target tissue is positioned at the isocenter of the treatment room.

A radiation treatment system includes a rotatable gantry that is configured to rotate about a treatment isocenter of the radiation therapy system, a treatment-delivering radiation source that is coupled to the rotatable gantry and directs a treatment beam through the treatment isocenter of the radiation therapy system, a first X-ray imager that is coupled to the rotatable gantry, and a second X-ray imager that is mounted on a component of the radiation therapy system and is fixed in position relative to a couch of the radiation therapy system while the rotatable gantry rotates about the treatment isocenter.

The application relates to a subject vertical positioning method, a subject vertical positioning device and a CT system. The method comprises the following steps: acquiring the position of an examination bed after the subject is positioned; determining a measurement range corresponding to the organ of the subject on the examination bed, the measurement range comprising a starting point and an ending point in the horizontal direction; during the movement of the examination bed towards a scanning frame, starting the measurement of the distance from the subject by a sensor attached to the scanning frame when the starting point reaches a measurement position of the sensor, and stopping the measurement when the ending point reaches the measurement position, and acquiring the height of the examination bed while the sensor is measuring; calculating the organ center height based on the measurement result of the sensor, the height of the sensor and the height of the examination bed, the height representing the average height of the organ in the vertical direction; and adjusting the height of the examination bed based on the organ center height, so that the adjusted organ center height is equal to the isocenter height of the scanning frame, so as to realize the effects of minimizing the radiation dose of the subject and improving the CT imaging quality.

An example radiation therapy system is described. The system includes a stationary support structure fixed to a support surface, a rotatable gantry with a treatment-delivering radiation source and at least one X-ray imager mounted thereon, and a couch-positioning system. The treatment-delivering radiation source directs a treatment beam through a treatment isocenter of the radiation therapy system. The rotatable gantry is rotatably coupled to the support structure and is configured to rotate about a bore of the radiation therapy system. The couch-positioning system is rotatably coupled to the support surface and the center of rotation is vertically aligned with the treatment isocenter.

We provide an isocenter evaluation technology that measures the position and size of the isocenter easily, quickly, and with high accuracy, minimizes the size, and achieves high reliability. The evaluation device (10) includes a laser tracker (15) that outputs a laser (30), a first probe (21) that is provided at three or more points on a support frame (25) and that reflects a first optical signal (11) when it receives the laser (30), a second probe (22) that is provided at three or more points on an intersection plane (36) of a beam (37) and that reflects a second optical signal (12) when it receives the laser (30), a calculation unit (16) that calculates a virtual point (38) of the isocenter based on information about the first optical signal (11), the second optical signal (12), and the radius R and rotation angle θ of the rotating frame (26), and a calculation unit (16) that calculates each of the calculated virtual points (38) of the isocenter by changing the rotation angle θ of the rotating frame (26). n It includes a recording unit 17 that records the data as point cloud data.

A control circuit identifies a plurality of radiation treatment arclets for a given radiation treatment platform and then identifies, for each of the plurality of radiation treatment arclets, a corresponding isocenter location within the patient. The foregoing can result in locating the platform isocenter at different locations within the patient during the course of a radiation treatment session for different ones of the arclets. A radiation treatment plan is optimized as a function of the plurality of arclets and their corresponding isocenter locations. By one approach, these teachings will include automatically dividing at least one initial template arc into at least two radiation treatment arclets. By one approach, identifying the corresponding isocenter locations for each of the plurality of radiation treatment arclets can comprise identifying the corresponding isocenter locations to maintain close proximity of a radiation treatment platform collimator to an exterior surface of the patient.

A system and method for a lidar guided patient positioning are described. An example imaging system includes a gantry having a bore, a table to move a subject relative to the bore, a radiation source mounted on the gantry and to emit an X-ray beam, and a detector to detect the X-ray beam. The system further includes a light detection and ranging (LiDAR) scanning system to acquire data of the subject. The system further includes processing circuitry to process the LiDAR data to generate a 3D point cloud representing a topography of the subject, estimate a center of a region of interest of the subject, calculate an offset of the center of the region of interest relative to an isocenter of the gantry, and adjust a height of the table based on the offset to align the center of the region of interest with the isocenter of the gantry.

The invention provides radiotherapy equipment, a calibration die body and a positioning lamp calibration method. The radiotherapy equipment comprises an annular rack, three positioning lamps and support assemblies in one-to-one correspondence with the positioning lamps. The three sets of support assemblies are arranged in the circumferential direction of the annular rack at intervals, and each positioning lamp is arranged on the corresponding support assembly and is adjustable in posture. The postures of the three positioning lamps meet the condition that one positioning lamp emits a positioning light beam corresponding to the sagittal plane of the human body, and the other two positioning lamps are oppositely arranged and respectively emit two positioning light beams which are perpendicular to each other and correspond to the cross section and the coronal plane of the human body one to one; and positioning light beams emitted by the three positioning lamps are intersected at a set virtual isocenter. According to the radiotherapy equipment, the positioning lamp is directly arranged on the annular rack of the radiotherapy equipment, so that the distance between the positioning lamp and the virtual isocenter is reduced, the moving distance of a user can be reduced in the process of debugging and calibrating the positioning lamp by the user, and the debugging and calibrating efficiency of the positioning lamp is improved.

The present disclosure relates to a radiotherapy device for delivering radiation to a subject. The device includes a radiation source configured to rotate about an isocenter and emit radiation in a radiation plane containing the isocenter. The device also includes a subject support surface including a portion configured to be located substantially at the isocenter. The subject support surface includes a subject support surface rotation mechanism configured to rotate the subject support surface about a rotation axis parallel to and spaced apart from an axis passing through the isocenter. The subject support surface also includes a first section configured to move from a first position to a second position along at least one of a longitudinal direction and a lateral direction. The device also includes a processor configured to control longitudinal and / or lateral movement of the first section as a function of rotation of the subject support surface to maintain the portion of the subject support surface substantially at the isocenter.

This invention proposes a radiotherapy device, method, and storage medium. The radiotherapy device includes a treatment gantry, a treatment bed, radiotherapy components, and a scanning imaging system. The scanning imaging system includes a scanning ring and a moving mechanism. The scanning ring is configured to rotate around its own axis and is equipped with the scanning imaging components. The moving mechanism connects the scanning ring and the treatment gantry and drives the scanning ring to move between an image acquisition position and a standby position. In the image acquisition position, the image isocenter coincides with the treatment isocenter or has a preset fixed deviation; in the standby position, the scanning ring is entirely outside the irradiation path of the treatment beam. This invention achieves the movement of the scanning ring between the image acquisition position and the standby position through the moving mechanism, ensuring diagnostic-grade imaging quality while avoiding interference between the treatment beam and the imaging components. This significantly improves the accuracy and reliability of image-guided radiotherapy and enhances the flexibility of treatment.

Provided is a particle beam measuring device that contributes to making work simpler and more efficient during beam adjustment, beam evaluation, or similar, as well as to saving space in a storage area for attachments or similar. This particle beam measuring device (10) comprises: a transport mechanism (40) that is for transporting a patient to the inside of a rotary gantry and causing an affected part of the patient to coincide with an isocenter through which a particle beam (11) passes; a phantom (20) on which the particle beam (11) is made to be incident for the purpose of measurement; and an attachment (30) that attaches the phantom (20) as an end effector of the transport mechanism (40).

The present disclosure may disclose methods and systems for treating an object. The method may include imaging an object fixed on a positioning device using an imaging device. The method may include obtaining a plan image of the object. The method may include generating information of a region of interest (ROI) of the object based on the plan image of the object. The method may include generating a treatment plan based on the information of the ROI. The treatment plan may include a plan isocenter on the plan image. The method may further include treating a target portion of the object based on the treatment plan using a treatment device. The object may be fixed on the positioning device from a moment that the object is started to fixed on the positioning device to an end of the treatment of the target portion.

The invention discloses a light limiting cylinder position calibration method and device based on EPID, equipment and a storage medium. The method comprises the following steps: acquiring an original calibration image of a light limiting cylinder by using the EPID; according to the isocenter coordinate of the image, intercepting an image in any region range of the isocenter of the original calibration image, and taking the image as a new calibration image for calculating the aperture parameter of the light limiting cylinder; pre-processing the new calibration image; binarizing the preprocessed new calibration image according to the penumbra coefficient; obtaining the boundary contour of the light limiting cylinder according to the new calibration image after binarization, and calculating the aperture parameter of the light limiting cylinder; and calculating the position of the circle center of the light limiting cylinder on the original calibration image based on the aperture parameter of the light limiting cylinder and the size of the area range of the intercepted image, and calibrating the position of the light limiting cylinder. According to the invention, the position of the light limiting cylinder can be identified and calibrated in real time.

An example radiation therapy system is described. The system includes a stationary support structure fixed to a support surface, a rotatable gantry that is rotatably coupled to the support surface and is configured to rotate about a bore of the radiation therapy system, a treatment-delivering radiation source that is coupled to the rotatable gantry and directs a treatment beam through a treatment isocenter of the radiation therapy system, and at least one X-ray imager that is coupled to the rotatable gantry and has an X-ray-receiving surface that is oriented at a non-orthogonal angle to X-rays received by the at least one X-ray imager.

Beam delivery and / or beam aiming subsystems included in a fast neutron therapy system. The beam delivery subsystem comprises a beamline having linear and curved portions. Quadrupoles along the beamline focus particles conveyed between an axled input and a neutron source (e.g., beryllium). A bend magnet(s) directs the particles to collide with the neutron source to release neutrons. A gantry (e.g., concrete, steel) includes an annular rim and opposing annular flanges that form a radial cavity and a perimeter “shield zone” channel. A collimator assembly (e.g., steel) projects radially inward from a slot void in the annular rim. A secondary collimator (e.g., steel, hydrogenous material) presents a barrel extending radially toward the gantry isocenter. The two collimators contour the neutrons into a high linear energy transfer (LET) beam. A drive rotates the gantry to set the delivery angle over approximately 360 degrees about the isocenter (e.g., patient table).