Radiation Imaging Calibration Using Laser Tracker Intermediary
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Solution Overview
Problem
Conventional radiation treatment systems face challenges in achieving high-accuracy calibration of imaging systems, particularly when the three-dimensional position of markers is unknown or includes errors, leading to inaccurate positioning of test objects and target tracking.
Innovation Solution
A treatment system comprising radiation sources, detectors, and a calibration processor that acquires and processes images to derive the positions of markers and imaging devices in a three-dimensional space, using methods like bundle adjustment to calibrate the system accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a phantom with a marker having a known position is installed at a predetermined position for calibration, then the imaging system can be calibrated, but high-accuracy calibration cannot be achieved when the three-dimensional position of the marker is unknown or includes an error
Solution Approach 1:
The patent introduces a laser tracker as an intermediary measurement device to accurately measure the three-dimensional position of markers. The laser tracker serves as a mediator between the marker position and the calibration process, providing precise position data even when the marker's predetermined position is unknown or contains errors. This intermediary measurement system enables high-accuracy calibration by obtaining reliable marker positions through independent laser-based measurement.
2Ease of operation
If the three-dimensional position of the marker is assumed to be known, then the calibration process can proceed, but the position of test objects and target tracking cannot be determined with high accuracy
Solution Approach 1:
The patent performs preliminary measurement of marker positions using a laser tracker before the calibration process. By pre-measuring and storing the accurate three-dimensional positions of markers, the system eliminates the need to assume known positions during calibration. This preliminary action ensures that subsequent test object positioning and target tracking can achieve high accuracy based on reliably measured marker positions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy determination of test object positions and target tracking by accurately calibrating the imaging system, even when three-dimensional marker positions are unknown or contain errors, thereby improving treatment precision.
Implementation Method 1
radiation sources that radiate radiation to a certain object in a plurality of different directions, and a plurality of detectors that detect the radiation radiated from the radiation sources
Data Source
AI summary
A treatment system of embodiments includes an imaging system including one or more radiation sources and a plurality of detectors, a first acquirer, a second acquirer, a first deriver, a second deriver, and a calibrator. The radiation sources radiate radiation to an object in a plurality of different directions. The plurality of detectors detect the radiation at different positions. The first acquirer acquires images based on the radiation. The second acquirer acquires position information of a first imaging device in a three-dimensional space. The first deriver derives the position of the object in the images. The second deriver derives the position of a second imaging device in the three-dimensional space based on the position of the object in the images, the position of the first imaging device, and the like. The calibrator performs calibration of the imaging system based on a derivation result of the second deriver.