Radiographic Imaging Device 3D Position Correction
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Solution Overview
Problem
Current radiographic imaging systems struggle to accurately determine the three-dimensional position of treatment instruments within complex body structures due to respiratory movements and deformation caused by instrument insertion, leading to inaccuracies in biopsy procedures.
Innovation Solution
A radiographic imaging apparatus that captures multiple two-dimensional images at different angles, generates calculated projection images, extracts characteristic regions, aligns and corrects for deformation, calculates three-dimensional positions, and superimposes corrected positions onto three-dimensional images using anatomical structure information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a projection X-ray image is used to guide treatment instrument insertion, then real-time position monitoring is achieved, but accurate determination of three-dimensional position (especially depth direction) becomes difficult
Solution Approach 1:
The patent transforms the two-dimensional projection image information into three-dimensional position data by integrating with pre-acquired three-dimensional images (CT or MRI). The system calculates the three-dimensional coordinates of the treatment instrument by combining the two-dimensional projection coordinates with the three-dimensional anatomical structure data, thereby resolving the depth direction ambiguity inherent in projection imaging.
2Ease of operation
If a two-dimensional projection image is used, then the position and direction perpendicular to the imaging axis are easily identified, but the position and direction parallel to the imaging axis (depth direction) cannot be accurately determined
Solution Approach 1:
The patent merges the two-dimensional projection image data with three-dimensional pre-examination image data to create a composite guidance system. The three-dimensional position calculator integrates coordinates from both data sources, allowing the system to leverage the ease of two-dimensional image interpretation while adding the depth information from three-dimensional imaging.
3Measurement precision
If multiple two-dimensional images at different angles are taken to improve three-dimensional position accuracy, then measurement precision improves, but device complexity and examination time increase
Solution Approach 1:
The patent performs the three-dimensional imaging (CT or MRI) in advance before the actual treatment procedure. This preliminary acquisition of three-dimensional anatomical data eliminates the need for complex real-time multi-angle imaging during the procedure, reducing both device complexity and examination time while maintaining high three-dimensional position accuracy.
4Loss of information
If the three-dimensional image is taken in advance, then three-dimensional position information is available, but body motion (respiratory movement) causes deformation between the pre-taken image and the actual examination, leading to position inaccuracies
Solution Approach 1:
The patent employs a feedback mechanism where the system continuously monitors the treatment instrument position in real-time projection images and compares it with the pre-acquired three-dimensional image data. The three-dimensional position calculator uses this feedback to dynamically adjust and correct the position information, compensating for body motion deformities that occur between the pre-examination and actual procedure.
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 precise detection and display of the three-dimensional position of treatment instruments, accounting for body motion and instrument-induced deformations, thereby improving accuracy during procedures like biopsy.
Implementation Method 1
a radiation source and a detector installed facing each other, configured to take a static image or a moving image of a subject
Implementation Method 2
A difference in absorption of X-rays passing through internal body substances is shown in the form of image
Data Source
AI summary
A radiographic imaging apparatus acquires a plurality of two-dimensional pickup images taken at different angles and a three-dimensional image of a processing target imaged in advance. Two-dimensional calculated projection images are generated from the three-dimensional image, respectively, in association with the two-dimensional pickup images. A characteristic region indicates a treatment instrument represented in the two-dimensional pickup image. The two-dimensional pickup image is aligned with the calculated projection image. A deformation amount of the processing target in the two-dimensional pickup image is calculated by comparing the two-dimensional pickup image with the calculated projection image, and a position of the characteristic region is corrected. A three-dimensional position of the characteristic region is calculated and corrected on the basis of anatomical structure information of the processing target. A position mapping part then superimposes the corrected three-dimensional position of the characteristic region on the three-dimensional image to be displayed on a display unit.