X-Ray Exposure Parameter Setting From Single-Angle Pre-Scan
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Solution Overview
Problem
Existing X-ray imaging systems face challenges in efficiently and accurately determining exposure parameters for multiple scanning angles due to the non-ideal cylindrical shape of the human body, leading to uneven radiation doses.
Innovation Solution
A system and method that utilizes pre-scan imaging data to determine chord lengths and exposure parameters based on these lengths, allowing for reduced radiation exposure and improved efficiency in image reconstruction by irradiating the subject from a single scanning angle during the pre-scan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple scanning angles are used to scan the patient, then the imaging completeness is improved, but the radiation dose becomes uneven and the determination of exposure parameters becomes complex
Solution Approach 1:
The patent performs a pre-scan at a fixed scanning angle to obtain preliminary imaging data of the patient's cross-sectional shape. Based on this pre-scan data, the system calculates the equivalent cylindrical radius and determines appropriate exposure parameters before the actual multi-angle scanning. This preliminary action allows the system to compensate for the non-cylindrical shape of the human body, ensuring more uniform radiation dose distribution across different scanning angles while maintaining imaging completeness.
2Reliability
If multiple scanning angles are used, then the imaging completeness is improved, but the efficiency of exposure parameter determination deteriorates
Solution Approach 1:
The system performs a pre-scan at a fixed angle to obtain the patient's cross-sectional shape information, then calculates the equivalent cylindrical radius and determines exposure parameters in advance. This preliminary determination of exposure parameters based on pre-scan data significantly improves the efficiency of the subsequent multi-angle scanning process, as the system no longer needs to determine parameters in real-time for each angle.
Solution Approach 2:
The patent transforms the complex multi-parameter determination problem into a simplified single-parameter calculation by introducing the equivalent cylindrical radius. Instead of determining exposure parameters for each scanning angle based on complex 3D geometry, the system converts the patient's cross-sectional shape into an equivalent cylinder representation, allowing exposure parameters to be determined based on this simplified geometric model, thereby improving determination efficiency.
3Object-affected harmful factors
If pre-scan is performed from a single scanning angle, then the radiation dose is reduced, but the accuracy of exposure parameter determination may deteriorate
Solution Approach 1:
The patent introduces the concept of equivalent cylindrical radius to simplify the geometric representation of the patient's cross-section. By converting the complex non-cylindrical shape into an equivalent cylinder model, the system can accurately determine exposure parameters using a single pre-scan angle. This parameter transformation maintains determination accuracy while significantly reducing the radiation dose from pre-scan operations.
Solution Approach 2:
The system extracts the essential geometric information (cross-sectional shape and equivalent cylindrical radius) from the pre-scan data at a single angle. By extracting this key geometric parameter, the system obtains sufficient information to determine exposure parameters accurately without needing to perform pre-scans from multiple angles, thereby reducing radiation exposure while maintaining determination accuracy.
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
Reduces radiation dose to the subject and enhances the accuracy and efficiency of exposure parameter determination and image reconstruction by focusing on a single scanning angle during the pre-scan.
Implementation Method 1
the target section may be irradiated by pre-scan radiation rays emitted by a radiation source
Implementation Method 2
The pre-scan imaging data may be collected by a detector of an X-ray imaging device
Data Source
AI summary
The present disclosure provides methods and systems for X-ray imaging. The methods may include obtaining pre-scan imaging data relating to a target section of a target subject. The methods may include determining, based on the pre-scan imaging data, a chord length of at least one chord of the target section. The methods may also include determining, based on the chord length of the at least one chord of the target section, exposure parameters to be used by the X-ray imaging device in a target scan of the target subject. The methods may further include reconstructing a target image of the target subject based on scan data collected by the X-ray imaging device in the target scan.