Dual-Energy Image Processing for Noise Reduction in Radiation Imaging
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Solution Overview
Problem
Radiation imaging systems using Flat Panel Detectors face increased quantum noise and image noise when reducing radiation dose, which affects the quality of bone and soft tissue images generated through energy subtraction techniques.
Innovation Solution
An image processing apparatus that acquires low-energy and high-energy information from images obtained by emitting radiation at multiple levels, calculates effective atomic number and surface density, and generates images with color information based on these calculations to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If radiation dose is reduced to minimize exposure, then patient safety is improved, but quantum noise increases and image quality deteriorates
Solution Approach 1:
The patent segments the image processing into multiple energy levels by acquiring images at different radiation energies (low energy and high energy). This segmentation allows separate analysis and processing of bone and soft tissue information, enabling noise reduction while maintaining image quality even at reduced radiation doses.
Solution Approach 2:
The patent changes the energy parameter of radiation by acquiring images at multiple energy levels (low energy and high energy). This parameter change enables the system to extract different tissue information (bone and soft tissue) and process them separately, improving image quality and reducing noise while maintaining low radiation dose.
2Loss of information
If energy subtraction processing is performed to separate bone and soft tissue images, then diagnostic information is improved, but noise in the processed images increases
Solution Approach 1:
The patent segments the energy spectrum into low energy and high energy components, processing bone and soft tissue information separately. This segmentation allows effective subtraction processing while maintaining signal-to-noise ratio, as each energy level provides complementary information about different tissue types.
Solution Approach 2:
The patent creates a composite processing approach by combining low energy and high energy images to generate separate bone images and soft tissue images. This composite method leverages the different attenuation characteristics of tissues at different energies, improving tissue differentiation while controlling noise through coordinated processing.
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 solution effectively reduces noise in images, enhancing the visibility of objects by providing clearer differentiation between bone and soft tissue images, even at reduced radiation doses.
Implementation Method 1
radiation imaging apparatus using a Flat Panel Detector (hereinafter abbreviated as FPD) that is made from a semiconductor material
Implementation Method 2
energy subtraction, a plurality of images that are formed using radioactive rays having mutually different levels of energy are acquired by emitting radioactive rays at different tube voltages
Data Source
AI summary
An image processing apparatus comprises an acquisition unit for acquiring low-energy information and high-energy information from a plurality of images that are obtained by emitting radiation toward an object, a calculation unit for calculating an effective atomic number and a surface density from the low-energy information and the high-energy information, and a generation unit for generating an image that includes color information based on the effective atomic number and the surface density.