Abstract: A method for operating a graph database, including receiving, by a computer system, a query to a particular graph database, the query identifying a plurality of vertices of the particular graph database. The method further includes performing, by the computer system, hash operations on two or more of the plurality of vertices to generate respective hash values and dividing, using the respective hash values, the query into a plurality of sub-queries, each corresponding to a subset of the plurality of vertices. The method also includes sending, by the computer system, ones of the plurality of sub-queries to a plurality of database repositories for the particular graph database.

Abstract: A method and apparatus for position detection, and a radiotherapy system are provided. The radiotherapy system includes: a treatment couch, a positioning apparatus, an optical tracking system and a computer; the positioning apparatus disposed on the treatment couch, and at least one reference point provided on the positioning apparatus; the optical tracking system disposed above the treatment couch and configured to detect relative positioning between a mark point set on a treated part of a patient and the reference point, determine deviation between the relative and reference positions, and send the deviation to the computer. The computer is configured to determine whether to adjust a position of the treatment couch based on the deviation and deviation range. The system provided by the present disclosure avoids the influence of patient movement on the accuracy of treatment, and prevents a treatment beam from damaging normal tissues of the patient.

Abstract: A device and method for controlling the rotation of radiotherapy equipment are provided. The device includes: a detector, configured to detect the rotation of a rotational load of the radiotherapy equipment, and record a rotational deviation amount when the rotational load rotationally deviates; and a controller, configured to generate correction instructions for eliminating the deviation according to the rotational deviation amount when the detector detects the rotational load of the radiotherapy equipment rotationally deviates. The deviation occurred to the rotation of the rotational load is timely corrected by monitoring the actual rotation of the rotational load of the radiotherapy equipment, thereby improving the safety and positioning accuracy of the radiotherapy equipment.

Abstract: A method and apparatus for position detection, and a radiotherapy system are provided. The radiotherapy system includes: a treatment couch, a positioning apparatus, an optical tracking system and a computer; the positioning apparatus disposed on the treatment couch, and at least one reference point provided on the positioning apparatus; the optical tracking system disposed above the treatment couch and configured to detect relative positioning between a mark point set on a treated part of a patient and the reference point, determine deviation between the relative and reference positions, and send the deviation to the computer. The computer is configured to determine whether to adjust a position of the treatment couch based on the deviation and deviation range. The system provided by the present disclosure avoids the influence of patient movement on the accuracy of treatment, and prevents a treatment beam from damaging normal tissues of the patient.

Abstract: A device and method for controlling the rotation of radiotherapy equipment are provided. The device includes: a detector, configured to detect the rotation of a rotational load of the radiotherapy equipment, and record a rotational deviation amount when the rotational load rotationally deviates; and a controller, configured to generate correction instructions for eliminating the deviation according to the rotational deviation amount when the detector detects the rotational load of the radiotherapy equipment rotationally deviates. The deviation occurred to the rotation of the rotational load is timely corrected by monitoring the actual rotation of the rotational load of the radiotherapy equipment, thereby improving the safety and positioning accuracy of the radiotherapy equipment.

Abstract: The present disclosure discloses a device for controlling rotation of a radiotherapy equipment, for controlling rotation of at least one rotational load of the radiotherapy equipment about a rotation axis. The device and the radiotherapy equipment form a full-closed-loop structure.

Abstract: The present invention discloses a method and device for monitoring a closed-loop control system and a closed-loop control system. The method comprises: acquiring a motion information value of a servo motor of the closed-loop control system in real time; comparing the motion information value with a corresponding preset threshold during the period T, and controlling the closed-loop control system to be closed when the motion information value is greater than the preset threshold; wherein T is the time required for the actuator of the closed-loop control system to complete the motion; and the preset threshold is a maximum motion threshold of the servo motor during the period T. The present invention can stop the operation of the machine when the galloping phenomenon is about to occur in the closed-loop control system, avoiding loss caused by machine damage.

Abstract: The present disclosure discloses a device for controlling rotation of a radiotherapy equipment, for controlling rotation of at least one rotational load of the radiotherapy equipment about a rotation axis. The device and the radiotherapy equipment form a full-closed-loop structure.