Systems and techniques may be used to estimate a real-time patient state during a radiotherapy treatment using a magnetic resonance linear accelerator (MR-Linac). For example, a method may include generating a dictionary of expanded potential patient measurements and corresponding potential patient states using a preliminary motion model. The method may include training, using a machine learning technique, a correspondence motion model relating an input patient measurement to an output patient state using the dictionary. The method may include estimating, using a processor, the patient state corresponding to a 2D MR image using the correspondence motion model. The method may include directing radiation therapy, using the MR-Linac, to a target according to the patient state.

A system for assisting in performing an interventional procedure includes a first subsystem (1) and a second subsystem at different places, especially in different rooms. At a first place the first subsystem a) generates a first image of a subject (22) while an interventional device (12) is introduced into the subject and b) determines the position of the interventional device within the subject. At a second place the second subsystem a) generates a second image of the subject with the introduced interventional device and b) plans and/or monitors a treatment based on the second image and the already determined position of the interventional device, i.e. the second subsystem does not need to start a completely new position determination procedure, thereby reducing technical efforts. Moreover, the first and second images are generated by different imaging modalities which allows for, for instance, improved image guidance, planning and/or monitoring.

A radiation treatment system and an operation procedure of an irradiation parameter verification device. The radiation treatment system comprises a radiation generation device, an irradiation chamber used for placing a patient, a carrying device used for transferring and bearing the patient, a collimator provided in the irradiation chamber, an irradiation parameter verification device used for determining whether the position of the patient is suitable for performing radiation irradiation treatment or not, and a collimator model, wherein the collimator comprises a collimator outlet; the collimator model comprises a collimator model outlet; the shape and the size of the collimator model outlet are the same as those of the collimator outlet, and the size of the collimator model in the direction perpendicular to the collimator model outlet is smaller than the size of the collimator in the direction perpendicular to the collimator outlet.

Disclosed is a radiotherapy monitoring system. The radiotherapy monitoring system includes: radiotherapy equipment, wherein the radiotherapy equipment includes a support apparatus for carrying a patient and is provided with one or more isocenters; and one or more stereo cameras, wherein the one or more stereo cameras correspond to the one or more isocenters in a one-to-one correspondence, a shooting range of each stereo camera covers an isocenter corresponding to the stereo camera, and the one or more stereo cameras are configured to acquire three-dimensional surface images of the patient to monitor a movement of the patient based on the three-dimensional surface image.

A computer-implemented method of performing a radiation therapy process includes: while a patient is disposed in a first position and maintains a first inspiration level, acquiring a set of projection images of a target volume associated with the patient; based on a treatment planning digital volume associated with the radiation therapy process and the set of projection images, generating a synthetic digital volume that includes the target volume; based on a treatment plan associated with the treatment planning digital volume and on the synthetic digital volume, generating a modified treatment fraction; and while the patient remains in the first position and maintains at least the first inspiration level, performing the modified treatment fraction.

A computer-implemented medical method of determining a breathing signal of a patient is disclosed. The method includes determining a motion trajectory of a structure associated with at least one body part of the patient, the motion trajectory being indicative of a respiratory movement of the structure, acquiring surface data representative of a position of a surface region of the patient, computing an intersection of the determined motion trajectory and the acquired surface data, and determining a breathing signal of the patient based on the computed intersection. The breathing signal is indicative of a breathing state of the patient.

The present disclosure discloses a positioning method, a processing device, a radiotherapy system and a storage medium, which belong to the field of medical technologies. The method includes: acquiring a three-dimensional body surface image of a patient on a support apparatus after receiving a positioning instruction; determining a first deviation between the three-dimensional body surface image of the patient and a first body surface reference image in each coordinate direction in the three-dimensional coordinate system, based on the three-dimensional body surface image of the patient and the first body surface reference image, so that the support apparatus is movable according to the first deviations in the various coordinate directions until the first deviations are within a preset threshold range after the movement.

Systems and methods for the delivery of linear accelerator radiotherapy in conjunction with magnetic resonance imaging in which components of a linear accelerator may be placed in shielding containers around a gantry, may be connected with RF waveguides, and may employ various systems and methods for magnetic and radio frequency shielding.

Systems and methods are described for the monitoring of patient motion via the detection of changes in capacitance, as measured using a capacitance position sensing electrode array. The changes in capacitance may be processed to determine a corresponding positional offset, for example, using a calibration data set relating capacitance to offset for each electrode of the array. The detected positional offset may be employed to provide feedback to a surgeon or operator of a medical device, or directly to the medical device for the control thereof. A medical procedure may be interrupted when the positional offset is detected to exceed a threshold. Alternatively, the detected positional offset may be employed to manually or automatically reconfigure a medical device to compensate for the detected change in position. Various configurations of capacitive position sensing devices are disclosed, including embodiment in incorporating capacitive sensing electrodes with a mask or other support structure.

A method of calibrating a monitoring system (10,14) is described in which a calibration phantom (70) is located with its center located approximately at the isocenter of a treatment room through which a treatment apparatus (16) is arranged to direct radiation, wherein the surface of the calibration phantom (70) closest to an image capture device (72) of the monitoring system (10,14) is inclined approximately 45° relative to the camera plane of an image capture device of the monitoring system. Images of the calibration phantom (70) are then captured using the image capture device (72) and the images are processed to generate a model of the imaged surface of the calibration phantom. The generated model of the imaged surface of the calibration phantom (70) is then utilized to identify the relative location of the center of the calibration phantom (70) and the camera plane of the image capture device (72) which is then utilized to determine the relative location of the camera plane of the image capture device and the isocenter of a treatment room.