Spectral Topogram-Based CT Parameter Adjustment
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Solution Overview
Problem
Current CT imaging systems face challenges in balancing radiation dose and image quality, particularly in adjusting parameters like tube current and voltage based on patient size and composition to minimize radiation exposure while maintaining suitable image quality.
Innovation Solution
The system determines imaging parameters, including X-ray tube current and voltage, by analyzing spectral topograms to estimate attenuation and composition, allowing for patient-specific adjustments to achieve desired image quality with reduced radiation dose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radiation tube current is increased to improve image quality, then image quality is improved, but radiation dose increases
Solution Approach 1:
The system applies different tube current settings to different regions of the patient's body based on local attenuation characteristics. By analyzing the spectral topogram to identify high-attenuation regions (such as the abdomen) and low-attenuation regions (such as the chest), the system locally adjusts the tube current to provide higher current where needed for image quality and lower current where sufficient, thereby resolving the contradiction between maintaining image quality and reducing overall radiation dose.
Solution Approach 2:
The system dynamically adjusts the radiation tube current during the CT scan based on real-time analysis of patient attenuation properties. Rather than using a fixed tube current setting, the system continuously adapts the current levels according to the specific attenuation characteristics encountered at each projection angle and z-position, allowing optimization of image quality while minimizing radiation dose exposure.
2Object-affected harmful factors
If radiation tube current is decreased to reduce radiation dose, then radiation dose is reduced, but image quality deteriorates
Solution Approach 1:
The system ensures adequate image quality in high-attenuation regions by applying higher tube current settings specifically to those areas identified through spectral topogram analysis. By concentrating the radiation dose where it is most needed for maintaining image quality while reducing it in low-attenuation regions, the system resolves the contradiction between dose reduction and image quality preservation.
Solution Approach 2:
The system changes the radiation tube current parameter dynamically based on the attenuation properties of different body regions. By adjusting this critical parameter according to the specific imaging requirements of each anatomical region, the system maintains image quality where necessary while reducing overall radiation dose, thereby resolving the contradiction between dose reduction and image quality.
3Ease of operation
If fixed tube current is used to simplify operation, then ease of operation is improved, but radiation dose efficiency deteriorates
Solution Approach 1:
The system performs automated analysis of the spectral topogram and self-adjusts the tube current settings without requiring manual intervention from the operator. The system autonomously identifies high- and low-attenuation regions and configures appropriate current levels, thereby maintaining ease of operation while achieving optimized radiation dose efficiency that would otherwise require complex manual parameter adjustment.
Solution Approach 2:
The system performs preliminary analysis of the patient's attenuation properties using spectral topogram acquisition before the main CT scan. This preliminary action allows the system to pre-determine the optimal tube current settings for different regions, simplifying the operation of the main scan while ensuring radiation dose efficiency is optimized based on the specific patient anatomy.
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 the reduction of radiation dose during CT scans while maintaining image quality by tailoring tube current and voltage settings to the patient's specific attenuation and composition, optimizing dose efficiency and image clarity.
Implementation Method 1
An X-ray image may be acquired by emitting radiation from an X-ray radiation source toward a patient and by receiving a radiation field of X-ray radiation which emerges from a side of the patient opposite the radiation source
Implementation Method 2
The radiation intensity at a particular location of the received radiation field represents the attenuative properties of internal patient structures which lie along a divergent line between the radiation source and the particular location of the radiation field
Data Source
AI summary
A system includes acquisition of a spectral topogram of a target, determination, based on the spectral topogram, of an attenuation associated with each of a plurality of regions of the target and a composition of each of the plurality of regions, determination of imaging parameters associated with the plurality of regions based on the determined attenuation and composition, and acquisition of an image of the target based on the imaging parameters.