X-ray CT Apparatus Dynamic Reconstruction Mode Switching
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Solution Overview
Problem
Current X-ray CT systems face challenges in efficiently collecting projection data and reconstructing images during electrocardiographic synchronized imaging operations, particularly when multiple examinations like myocardial perfusion, CT angiography, and cardiac function analysis are performed collectively, requiring optimal X-ray exposure timing and temporal resolution, which is complicated and labor-intensive for operators.
Innovation Solution
An X-ray CT apparatus equipped with an electrocardiographic information collecting unit, data collecting unit, image reconstructing unit, concentration calculating unit, and reconstruction condition changing unit that dynamically adjusts reconstruction modes and imaging conditions based on contrast medium concentration, allowing for efficient data collection and image reconstruction while minimizing radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple examination types (myocardial perfusion, CTA, CFA) are performed collectively with different X-ray exposure timings and phase ranges, then comprehensive diagnostic information is obtained, but the operation complexity and labor intensity increase significantly
Solution Approach 1:
The system implements a unified automatic control mechanism that handles multiple examination types (myocardial perfusion, CTA, CFA) through a single integrated process. The control unit automatically determines optimal X-ray exposure timings and phase ranges based on the selected examination type, eliminating the need for manual configuration and reducing operational complexity while maintaining versatility across different cardiac imaging protocols
Solution Approach 2:
The system automatically adjusts critical parameters including X-ray exposure timing, phase range selection, and temporal resolution settings based on the examination type. By dynamically changing these parameters through automated control rather than manual intervention, the system reduces operational complexity while adapting to the specific requirements of each examination type
2Manufacturing precision
If high temporal resolution is achieved through segment reconstruction using multiple heartbeats, then image quality improves, but the imaging time and radiation exposure increase
Solution Approach 1:
The system dynamically adjusts the temporal resolution and segment reconstruction parameters based on the specific examination type and clinical requirements. For examinations requiring high temporal resolution like CTA, the system automatically configures appropriate segment reconstruction settings, while for examinations like myocardial perfusion where lower temporal resolution suffices, it reduces the number of heartbeats used, thereby optimizing imaging time and radiation exposure for each specific application
3Manufacturing precision
If X-ray exposure is increased to improve image quality for multiple examination types, then diagnostic accuracy improves, but radiation exposure to the subject increases
Solution Approach 1:
The system applies local optimization by determining specific X-ray exposure parameters tailored to each examination type and region of interest. Rather than using uniform high exposure settings for all examinations, the control unit automatically configures appropriate exposure levels for myocardial perfusion, CTA, and CFA based on their respective diagnostic requirements, thereby maintaining image quality while minimizing unnecessary radiation exposure
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
The system enables efficient collection of projection data and reconstruction of images suitable for various examinations, optimizing X-ray exposure and temporal resolution, thereby reducing radiation exposure and simplifying the complex imaging process.
Implementation Method 1
an X-ray tube that irradiates the subject with X-rays
Implementation Method 2
collects projection data by detecting the X-rays passing through the subject
Data Source
AI summary
A CT value of an image within a region of interest is calculated with time. While the calculated CT value does not exceed a predetermined threshold value, a reconstruction mode used when an image is reconstructed from projection data is set to half reconstruction. On the other hand, while the calculated CT value exceeds a predetermined threshold value, the reconstruction mode is set to segment reconstruction.