X-ray Diagnostic Apparatus Position Correction for Reduced Exposure
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Solution Overview
Problem
Current X-ray image diagnostic apparatuses face challenges in accurately positioning treatment devices within blood vessels due to insufficient accuracy of position detectors, leading to increased exposure doses for patients during minimally invasive treatments.
Innovation Solution
The X-ray image diagnostic apparatus generates positional deviation correction data by comparing treatment device information with position information from a position detector, allowing for accurate positional correction and reduced exposure doses by limiting X-ray irradiation to a narrow region around the treatment device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous X-ray imaging is performed in fluoroscopic mode to monitor treatment device position in real time, then the position information can be obtained continuously, but the exposure dose to the patient increases significantly
Solution Approach 1:
The patent divides the imaging process into two distinct segments: (1) a reference image acquisition phase where a single X-ray image is captured with contrast agent injection, and (2) a position information acquisition phase where position detector data is collected without continuous X-ray imaging. This segmentation eliminates the need for continuous fluoroscopic imaging while maintaining position monitoring capability through the combination of reference image and position detector information.
Solution Approach 2:
The patent introduces a position detector as an intermediary device that measures treatment device position independently of X-ray imaging. The position detector acts as a mediator between the treatment device and the imaging system, providing position information that can be superimposed on reference images without requiring continuous X-ray irradiation, thus reducing patient exposure dose.
2Object-affected harmful factors
If position detector is used to measure treatment device position separately and superimpose on reference image data, then exposure dose is reduced, but the position information accuracy becomes insufficient due to limited detector precision
Solution Approach 1:
The patent merges the reference image data (obtained through X-ray imaging with contrast agent) and position information (obtained through position detector) into a single composite display. By combining these two data sources, the system achieves both reduced exposure dose (from intermittent imaging) and maintained position information accuracy (through the complementary strengths of both imaging and position detection systems).
Solution Approach 2:
The system uses the position detector to continuously monitor treatment device position and provides feedback by superimposing this position information on the reference image data in real-time. This feedback mechanism allows the operator to adjust the treatment device position based on accurate, low-dose position information, maintaining measurement precision while reducing overall exposure dose.
3Object-affected harmful factors
If X-ray imaging is performed only when needed for position correction, then exposure dose is reduced, but the timing of imaging becomes less flexible and may delay treatment
Solution Approach 1:
The patent implements a dynamic imaging timing system where X-ray imaging is performed intermittently at specific moments (such as before contrast agent injection or when position deviation is detected) rather than continuously. This dynamic approach allows the system to adapt imaging timing to actual treatment needs, maintaining flexibility when required while minimizing exposure dose during periods when continuous imaging is not necessary.
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
This approach enables accurate monitoring and positioning of treatment devices with reduced patient exposure to X-rays, improving the precision of minimally invasive procedures while minimizing radiation exposure.
Implementation Method 1
an X-ray generation unit and an X-ray detection unit (hereinafter, these are referred to collectively as an imaging system)
Data Source
AI summary
An X-ray image diagnostic apparatus includes an X-ray imager, an image data generator, a position information acquisition mechanism, a position information corrector, and a display. The X-ray imager generates projection data by X-ray imaging in first and second imaging modes for a patient. The image data generator generates reference image data based on projection data in the first imaging mode and image data for positional deviation correction based on projection data in the second imaging mode. The position information acquisition mechanism acquires position information of a treatment device inserted into the patient. The position information corrector corrects the position information of the treatment device based on the position information of the treatment device and treatment device information of the image data for positional deviation correction, collected by X-ray imaging in the second imaging mode. The display displays the reference image data to which the corrected position information is added.