Biopsy Apparatus Coordinate System Calibration
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Solution Overview
Problem
Current biopsy apparatuses face challenges in accurately associating the tomosynthesis coordinate system with the biopsy coordinate system, leading to potential deviations when targeting lesions, especially when using tomosynthesis imaging, which increases the burden on users and complicates calibration processes.
Innovation Solution
A biopsy apparatus incorporating a radiation source, detector, stereotactic image generator, tomosynthesis image generator, biopsy needle driver, designated-target position identification section, and target position conversion section, which corrects tube positions and converts designated positions from tomosynthesis to stereotactic coordinates, ensuring precise alignment and calibration between coordinate systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If tomosynthesis imaging is used to identify lesion position, then image definition and lesion visibility are improved, but coordinate system association complexity and calibration burden increase
Solution Approach 1:
The patent uses the stereotactic coordinate system as an intermediary between the tomosynthesis coordinate system and the biopsy coordinate system. By converting tomosynthesis images to stereotactic coordinates and performing calibration between stereotactic and biopsy systems, the system avoids direct complex association between tomosynthesis and biopsy coordinate systems, thereby reducing overall system complexity while maintaining positioning accuracy.
2Manufacturing precision
If mechanical adjustment with high degree of accuracy is performed, then coordinate system coincidence is improved, but manufacturing and adjustment difficulty increase
Solution Approach 1:
The patent replaces mechanical adjustment methods with computational coordinate conversion and calibration. Instead of relying on precise mechanical alignment between coordinate systems, the system uses software-based coordinate transformations and calibration algorithms to achieve accurate positioning, significantly reducing manufacturing and adjustment difficulties.
3Measurement precision
If calibration between coordinate systems is performed, then positioning accuracy is improved, but calibration time and user burden increase
Solution Approach 1:
The patent performs calibration between the stereotactic coordinate system and the biopsy coordinate system in advance, before actual biopsy operations. By establishing the transformation relationship between coordinate systems beforehand and storing calibration data, the system eliminates the need for repeated calibration during procedures, reducing time loss and user burden during actual use.
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 accurate and efficient association of the tomosynthesis coordinate system with the biopsy coordinate system, allowing for precise insertion of the biopsy needle based on tomosynthesis image designations, reducing user burden and improving calibration accuracy.
Implementation Method 1
a radiation source for irradiating radiation toward a subject to be examined
Implementation Method 2
a radiation detector for detecting radiation which has been irradiated from the radiation source and passed through the subject so as to generate a radiographic image
Data Source
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AI summary
A position of a target designated based on a tomosynthesis image is identified as a first designated position. The first designated position is virtually projected to a radiation detector from two calibrated-stereotactic tube positions which have been calibrated into a tomosynthesis coordinate system so as to obtain two projection positions. The first designated position is converted into a second designated position in a stereotactic coordinate system based on stereotactic tube positions and the projection positions. A biopsy needle is inserted into a subject to be examined based on the second designated position. The biopsy needle is driven based on a biopsy coordinate system calibrated with respect to the stereotactic coordinate system.