X-ray Source Intensity Modulation for Respiratory Motion
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Solution Overview
Problem
Existing x-ray diagnostic methods expose patients to unnecessary x-ray radiation during phases of the respiration cycle where image information is not required, leading to increased x-ray doses and potential errors in image reconstruction.
Innovation Solution
Modulating the intensity of x-ray radiation based on the amplitude and position of respiration signals to reduce exposure during non-relevant phases of the respiration cycle, while maintaining a low intensity for supplementary projections, ensuring high-quality image reconstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If x-ray projections are acquired continuously during the entire respiration cycle, then sufficient projection data is obtained for image reconstruction, but the patient is exposed to unnecessary x-ray radiation during phases where image information is not required
Solution Approach 1:
The patent applies dynamics by making the x-ray source intensity adjustable and controllable based on real-time respiration phase detection. The system dynamically adapts the radiation intensity to match the informational value of each respiration phase, reducing intensity during phases where projections would not contribute to the desired image reconstruction.
Solution Approach 2:
The patent changes the parameter of x-ray radiation intensity based on the detected respiration phase. By monitoring respiration signals and correlating them with projection acquisition timing, the system modifies the radiation intensity parameter to be high only during phases that contribute to image reconstruction and low during phases that do not.
2Object-affected harmful factors
If x-ray intensity is reduced to zero during non-relevant respiration phases, then patient exposure is minimized, but projection acquisition errors may occur that cannot be compensated
Solution Approach 1:
The patent applies partial action by reducing x-ray intensity to a low non-zero level during non-relevant respiration phases rather than completely shutting it off. This provides a safety margin that ensures sufficient projections are acquired even if some are lost or erroneous, while still significantly reducing the overall patient dose compared to continuous full-intensity acquisition.
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 reduces the overall x-ray dose to the patient while ensuring high-quality image reconstruction by adjusting x-ray intensity according to the patient's specific respiration cycle, providing a safety net for potential errors in projection acquisition.
Implementation Method 1
an x-ray source (4) which emits an x-ray radiation (5)
Implementation Method 2
an x-ray detector (6) which detects the x-ray radiation (5)
Data Source
AI summary
In a method and an x-ray diagnostic device for generation of an image of a body region of a living subject that executes a movement due to respiration, respiration signals of the subject are acquired and x-ray projections of the subject are acquired from different projection directions. The intensity of the x-ray radiation emanating from an x-ray source in the acquisition of the x-ray projections is modulated such that the intensity assumes a desired value, or a value decreased relative to the value, dependent on the value of the amplitude of the respiration signal and/or the respiration position of the subject.