Virtual Mask Radiation Dose Modulation in CT Scanning
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Solution Overview
Problem
Current methods for reducing radiation dose in CT scans either compromise image quality, are not cost-effective, or introduce artifacts, failing to effectively protect sensitive tissues while maintaining image quality.
Innovation Solution
A method and system that utilize a virtual mask representation to select and display radiation dose modulation based on the shape of organs to be masked, allowing for beam modulation and optimized attenuation profiles, thereby reducing radiation dose while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If physical shields (bismuth-impregnated latex sheets) are used to reduce radiation dose to sensitive organs, then radiation dose reduction is achieved, but image artifacts are introduced near the shields
Solution Approach 1:
The patent creates a virtual mask representation that copies the anatomical structure of sensitive organs from the scout image. This virtual mask is then used to modulate the radiation beam without introducing physical artifacts. The virtual copy allows dose reduction planning without the harmful side effects of physical shields.
Solution Approach 2:
The patent replaces the mechanical/physical shielding system with a computational/digital system. Instead of using physical bismuth-impregnated sheets that cause artifacts, the system uses software-generated virtual masks combined with beam modulation technology to achieve the same protective effect without introducing image degradation.
2Object-affected harmful factors
If x-ray tube current is decreased to reduce radiation dose, then radiation dose reduction is achieved, but image noise increases
Solution Approach 1:
The patent applies local quality by creating spatially varying beam modulation based on the virtual mask representation. Different regions of the patient's anatomy receive different radiation doses - sensitive organs identified by the virtual mask receive reduced dose while other regions maintain normal dose levels. This localized approach protects specific organs without globally reducing tube current and causing image noise.
Solution Approach 2:
The patent changes the radiation dose parameter dynamically during the scan based on the virtual mask representation. The system modulates beam intensity in real-time according to the anatomical structures identified in the scout image, allowing dose reduction in specific regions while maintaining adequate dose in other regions for image quality.
3Object-affected harmful factors
If selective in-plane shielding is implemented to protect sensitive tissues, then radiation dose reduction is achieved, but image quality is reduced and cost increases
Solution Approach 1:
The patent implements a dynamic beam modulation system that adjusts radiation intensity in real-time during the CT scan based on the virtual mask representation. Unlike static physical shields, the system continuously modulates the beam according to the anatomical structures and scan parameters, optimizing both dose reduction and image quality throughout the scanning process.
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 allows for precise control of radiation dose distribution, enhancing protection of healthy tissues and maintaining image quality by varying radiation levels according to patient anatomy, thereby reducing radiation exposure effectively.
Implementation Method 1
manipulating radiation dose to be delivered so as to modify the virtual mask representation to obtain an optimum attenuation profile
Data Source
AI summary
In one embodiment, a method to reduce the radiation dose delivered by an imaging system is provided. The method comprises steps of selecting a virtual mask representation based on the shape of an organ to be masked, displaying the virtual mask representation on a scout image and manipulating radiation dose to be delivered so as to modify the virtual mask representation to obtain an optimum attenuation profile.