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In the field of radiation therapy (radiotherapy), millimeter-level errors can mean damage to healthy tissue or missed photos of tumor sites. With the increasing sophistication of radiotherapy technology, the need for clinical verification of patient position and real-time monitoring has reached an unprecedented level. Conventional optical surface imaging systems are facing challenges in terms of accuracy, interference resistance, and adaptability to complex surfaces. In this paper, we will discuss how HongKe's vision positioning system based on a high-precision binocular scatter 3D camera can revolutionize the radiotherapy positioning process and enhance the safety and efficacy of cancer treatment.
The core goal of radiation therapy (radiotherapy) is to deliver a high dose of radiation precisely to the tumor area while maximizing the protection of surrounding normal tissue. However, in the actual process of precision radiotherapy, thePositional management of patientsIt became a critical bottleneck:
Adverse consequences: Postural deviations can cause radiation dose distribution to deviate from the original plan, which in turn can reduce tumor control rates or significantly increase the risk of complications in normal tissue.
With its unique imaging principle, binocular scattering 3D camera technology is an ideal solution for radiotherapy localization pain points. The core workflow of HongKe's solution is to actively project a high-density, high-contrast laser scatter pattern onto the target area, and two high-precision calibrated cameras simultaneously capture the surface-modulated scatter image from different angles. Finally, based on the triangulation principle and advanced stereo matching algorithm (utilizing the uniqueness of the scatter pattern), the system quickly calculates and generates high-density three-dimensional point cloud coordinates of the object surface.
Radiotherapy vision positioning systems based on binocular scatter 3D cameras have a clear architecture. The hardware core is a high-precision binocular scatter 3D camera module, which is usually mounted on a rack on either side or above the treatment bed, and its field of view needs to cover the patient's treatment area completely. Key performance indicators include accuracy, resolution, field of view (FOV), working distance and frame rate. The equipment needs to be crash and radiation resistant (or easily shielded) for safe integration into the radiotherapy room environment, with a high performance computing unit responsible for real-time data processing.
At the software level, the core point-and-cloud alignment algorithm is first performedRigid alignmentThe optimal spatial transformation (including translation and rotation deviations) between the current patient's body surface point cloud and the reference point cloud extracted from the outer surface of the planned CT image (or the reference surface model created at the time of the first treatment) is accurately calculated, which is the basis for the accurate reproduction of the "planned body position".
For more advanced clinical applications, the system can useDeformation Alignment TechnologyThe system is designed to handle non-rigid deformations due to respiration, organ motion, or weight changes to provide more detailed information about the displacement field. The system interface visually displays the translational (ΔX, ΔY, ΔZ) and rotational (Roll, Pitch, Yaw) deviations of the patient's current position from the reference position.
In addition, the safety monitoring and alarm function supports the setting of specific displacement thresholds to instantly monitor any patient movement during treatment. Once a displacement above the safety threshold is detected, the system triggers an audible and visual alarm and sends a signal to the gas pedal control system to pause the radiation exposure. The Data Management and Reporting Module automatically records positional error data before each treatment, movement trajectories during treatment, and generates standardized quality control (QC) reports to provide an objective basis for continuous improvement by the medical team.
The radiotherapy center of a large oncology hospital introduced a vision positioning system based on binocular scatter 3D camera (core camera parameters: accuracy ±0.1mm @1m, FOV 900x866mm @1m), which was successfully applied to the position management of Nasopharyngeal Carcinoma Intensity-Modulated Radiation Therapy (IMRT) patients.
The high-precision binocular scatter 3D camera technology provides a revolutionary solution for body surface localization and monitoring in the field of radiation therapy. The technology combines the core advantages of non-contact, sub-millimeter high accuracy, strong interference resistance, and full-field high-speed dynamic measurement, effectively breaking through the bottleneck of traditional methods in terms of accuracy, efficiency, and reliability.
By deeply integrating into the whole process of radiotherapy, HongKe's system not only greatly improves the accuracy and efficiency of initial positioning, but also builds a solid defense for patient safety through real-time dynamic monitoring, and accumulates valuable objective and quantitative quality-control data for medical institutions.
With the continuous evolution of medical technology and its synergistic innovation with adaptive radiotherapy (ART), artificial intelligence (AI) and other cutting-edge fields, vision localization system based on binocular scatter 3D camera will surely become an indispensable core pillar in the system of precision radiotherapy, contributing a key force in enhancing the effectiveness of cancer treatment and improving the quality of patient's survival.
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