Bore 3D Camera Layout Using Mirrors for Accurate Patient Tracking

The patent applies dimensionality change by mounting image sensors on opposing surfaces of a circuit board (transitioning from planar to three-dimensional arrangement) and using mirrors to redirect optical paths. This allows the camera system to achieve a larger effective field of view and better positioning accuracy without increasing the physical volume occupied in the confined bore space.

The patent implements nesting by integrating multiple image sensors and mirrors within a compact camera housing that fits inside the bore of the medical apparatus. The opposing surface mounting of sensors and the folded optical paths using mirrors allow the system to nest complex optical components within a small form factor, maintaining high measurement precision while minimizing space occupation.

The patent uses dimensionality change by employing mirrors to fold the optical paths, effectively extending the field of view in three-dimensional space without increasing the physical footprint of the camera system. The opposing surface sensor mounting also contributes to this dimensional optimization.

The patent introduces mirrors as intermediary elements that redirect light paths between the image sensors and the patient. These mirrors act as mediators that expand the effective field of view and improve positioning accuracy without requiring the sensors to be physically larger or positioned farther from the patient.

The patent applies preliminary action by providing a dedicated calibration method that is performed before the camera system is used for patient monitoring. The calibration process using calibration objects with known geometries pre-establishes the spatial relationships and alignment parameters between the opposing surface-mounted sensors, thereby simplifying subsequent operation and reducing the complexity of real-time alignment.

The patent uses parameter changes by systematically adjusting and determining intrinsic parameters (such as focal length, principal point, and distortion coefficients) and extrinsic parameters (such as relative positions and orientations of sensors) during calibration. This parameter-based approach provides a structured method to manage and reduce the complexity of aligning sensors on opposing surfaces.

The patent applies parameter changes by comprehensively determining both intrinsic and extrinsic parameters of the multi-sensor system during calibration. This systematic parameter characterization enables the system to accurately process images from multiple sensors and mirrors, thereby maintaining high patient position detection accuracy despite the increased complexity of the optical configuration.

The patent implements feedback through the calibration process, which uses calibration objects with known geometries to provide reference information for adjusting and verifying the parameters of the image sensors and mirrors. This feedback mechanism ensures that the system can accurately detect and measure patient positions by continuously referencing the calibrated parameter values.