Layered Radiography Dose Control for Energy Subtraction Imaging
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Solution Overview
Problem
In radiography systems using layer structure detectors, the radiation dose irradiated onto the detector far from the radiation source is often insufficient, leading to a decreased signal-to-noise ratio and reduced image quality during energy subtraction processing.
Innovation Solution
A radiography control device that utilizes a layer structure detector with multiple dose detection pixels to determine the appropriate radiation detector(s) for dose control based on the imaging purpose, ensuring adequate radiation dosage is applied to the relevant detector(s) for high-quality image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a layer structure detector is used for energy subtraction processing, then the ability to perform energy subtraction imaging is improved, but the radiation dose reaching the radiation detector on the side far from the radiation source becomes too small, decreasing the signal-to-noise ratio and image quality
Solution Approach 1:
The system dynamically selects which radiation detector to use for dose control based on the imaging purpose. For simple imaging, the detector closest to the radiation source is selected, while for energy subtraction imaging, the detector farthest from the radiation source is selected to ensure adequate dose reception and maintain signal-to-noise ratio
Solution Approach 2:
The system changes the dose control parameter selection based on imaging mode. By switching which detector's dose is used for control according to the imaging purpose, the system optimizes the radiation dose distribution to ensure sufficient dose reaches the appropriate detector for high-quality image acquisition
2Measurement precision
If the radiation detector far from the radiation source is used for dose control, then the signal-to-noise ratio is improved, but the device complexity increases due to needing to select among multiple detectors
Solution Approach 1:
The system automatically determines which radiation detector to use for dose control based on the imaging purpose without requiring manual intervention. The processor autonomously selects the appropriate detector (closest or farthest from radiation source) based on predefined imaging modes, simplifying the user interface while maintaining optimization
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 acquisition of high-quality radiation images by optimizing the radiation dose distribution across the detectors, improving image quality, especially in energy subtraction imaging.
Implementation Method 1
a radiation detector such as a flat panel detector (FPD)... that detects radiation transmitted through a subject with a radiation detector
Implementation Method 2
energy subtraction processing using two radiation images obtained by irradiating a subject with two types of radiation having different energy distributions by using the fact that an attenuation amount of the transmitted radiation differs depending on the substance constituting the subject
Data Source
AI summary
A radiography control device that controls radiography of an imaging target by irradiating the imaging target with radiation emitted from a radiation source is provided. The radiography control device includes a layer structure detector configured by stacking a plurality of radiation detectors each having a plurality of dose detection pixels for detecting a dose during radiography, and at least one processor. The processor acquires an imaging purpose, determines at least one radiation detector to be used for dose control of radiation during radiography among the plurality of radiation detectors according to the imaging purpose, and performs the dose control according to a dose detected by a dose detection pixel of the determined radiation detector.