Layered Radiography Exposure Assessment for Energy Subtraction Imaging
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Solution Overview
Problem
In radiographic imaging using a layer structure detector, the radiation dose received by detectors varies, leading to decreased signal-to-noise ratio or pixel saturation, degrading image quality during energy subtraction processing.
Innovation Solution
A radiography control device that determines radiation excess or insufficiency by analyzing radiation images from multiple detectors, specifying subject regions, and adjusting dose settings to achieve optimal image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radiation dose is increased to ensure sufficient signal for the radiation detector far from the source, then the signal-to-noise ratio improves, but the pixel value of the radiation detector close to the source becomes saturated
Solution Approach 1:
The patent applies local quality by assigning different radiation dose requirements to different detectors based on their positions. The first radiation detector (close to source) and second radiation detector (far from source) receive different doses, with the second detector receiving higher dose to compensate for distance attenuation. This resolves the contradiction by allowing each detector to operate in its optimal range without mutual interference.
2Object-affected harmful factors
If the radiation dose is decreased to prevent pixel saturation in the radiation detector close to the source, then pixel saturation is avoided, but the signal-to-noise ratio of the radiation detector far from the source decreases
Solution Approach 1:
The patent changes the radiation dose parameter differently for each detector based on their specific requirements. The control device calculates and sets distinct dose values: a first dose for the near detector and a second dose (higher than the first) for the far detector. This parameter differentiation resolves the contradiction by optimizing each detector's operating conditions independently.
3Ease of operation
If energy subtraction processing is performed with fixed dose settings, then processing simplicity is maintained, but image quality degrades due to either noise or saturation
Solution Approach 1:
The patent introduces dynamics by making the radiation dose adaptive rather than fixed. The control device dynamically calculates and adjusts the radiation dose based on detector position, subject characteristics, and imaging conditions before each energy subtraction processing operation. This dynamic adjustment maintains processing simplicity while significantly improving image quality by preventing both noise and saturation issues.
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
Ensures high-quality radiation images by accurately adjusting radiation doses to prevent noise and saturation, enhancing image quality in both simple and energy subtraction imaging modes.
Implementation Method 1
a layer structure detector configured by stacking a plurality of radiation detectors is irradiated with radiation emitted from a radiation source and transmitted through an imaging target
Implementation Method 2
using the fact that an attenuation amount of the transmitted radiation differs depending on the substance constituting the subject
Data Source
AI summary
The processor acquires a plurality of radiation images from a plurality of radiation detectors by performing radiography in which a layer structure detector configured by stacking the plurality of radiation detectors is irradiated with radiation emitted from a radiation source and transmitted through an imaging target, determines excess or insufficiency of the radiation at a time of the radiography based on at least one radiation image of the plurality of radiation images, and notifies a determination result of the excess or insufficiency.