Standing X-Ray Scan Current Modulation for Low-Dose Bone Imaging
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Solution Overview
Problem
Radiological imaging methods face challenges in reducing radiation dose while maintaining image quality, particularly in vertical scanning of standing patients, where existing Automatic Exposure Control (AEC) systems are inadequate due to limitations in voltage and current modulation, and are not compatible with scanning radiography systems.
Innovation Solution
A radiological imaging method using two radiation sources with orthogonal imaging directions, where current intensity is modulated based on patient thickness and specific bone localization without voltage modulation, allowing for reduced radiation dose while maintaining sufficient image contrast, especially in critical regions like the spine, using a simpler and cheaper current intensity modulation radiation generator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If standard AEC systems with dosimeter cells are used in scanning radiography, then automatic exposure control is achieved, but the system is incompatible with scanning radiography due to static measurement and limited field of view
Solution Approach 1:
The patent transforms the static dosimeter cell into a dynamic system by moving it along with the X-ray source and detector during scanning. The dosimeter continuously tracks the scan position, enabling real-time exposure control that adapts to varying patient thickness throughout the scanned region, thereby achieving compatibility with dynamic scanning radiography.
Solution Approach 2:
The patent divides the scanned region into multiple segments along the scan direction, with the dosimeter measuring exposure at different positions. Each measurement segment corresponds to a specific thickness region, allowing independent exposure optimization for each segment while maintaining overall system compatibility.
2Object-affected harmful factors
If radiation dose is reduced to lower patient exposure, then patient safety is improved, but image quality deteriorates due to insufficient signal and increased noise
Solution Approach 1:
The patent applies local quality by using the dosimeter to measure patient thickness and adjust exposure parameters locally at each scan position. The system modulates X-ray tube current based on real-time dosimeter readings, optimizing radiation dose and image quality for each specific anatomical region rather than using a uniform exposure setting throughout the scan.
Solution Approach 2:
The patent implements a feedback control loop where the dosimeter continuously monitors exposure conditions during scanning, and the system automatically adjusts X-ray tube current based on this feedback. This closed-loop control ensures optimal image quality while minimizing radiation dose by adapting exposure parameters to actual patient attenuation characteristics.
3Manufacturing precision
If voltage intensity modulation is used to adapt radiation dose to patient thickness, then image contrast is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the controlled parameter from voltage modulation to current modulation. By modulating the X-ray tube current while maintaining constant voltage, the system achieves adaptive radiation dose adjustment based on patient thickness without requiring complex voltage modulation circuitry, thereby reducing device complexity and cost while maintaining image contrast quality.
4Object-affected harmful factors
If current intensity is modulated based on patient thickness and bone localization, then radiation dose is reduced while maintaining image contrast, but requires sophisticated control algorithms
Solution Approach 1:
The patent performs preliminary action by conducting a low-dose scout scan before the main imaging scan. The scout scan provides advance information about patient thickness and bone localization, allowing the control algorithm to pre-calculate optimal current modulation parameters for the subsequent scan, thereby reducing the complexity of real-time control while achieving dose reduction and maintaining image contrast.
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 effectively reduces the global radiation dose while maintaining local image contrast at a sufficient level, enabling clear visualization of specific bones and lesions, even in varying patient thicknesses, with improved scanning speed and reduced artifacts, making the method more patient-specific and cost-effective.
Implementation Method 1
a radiation source emitting a radiation beam in a radiation direction
Implementation Method 2
current intensity is modulated based on patient thickness and specific bone localization
Data Source
AI summary
A radiological imaging method including 2 radiation sources with imaging directions orthogonal to each other, performing vertical scanning of a standing patient along a vertical scanning direction, wherein radiological method includes at least one operating mode in which: a frontal scout view is made so as to identify a specific bone(s) localization within the frontal scout view, driving current intensity modulation of the frontal radiation source, depending on patient thickness and on the identified specific bone(s) localization along the vertical scanning direction, is performed automatically, so as to improve a compromise between: lowering the global radiation dose received by a patient during the vertical scanning, while keeping at a sufficient level the local image contrasts of the identified specific bone(s) localization at different imaging positions along the vertical scanning direction, for the frontal image.