FFS X-Ray Beam Geometry Control for Cross-Radiation Prevention
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Solution Overview
Problem
Conventional FFS X-ray systems face issues with cross-radiation, where the X-ray beam irradiates regions outside the detector, posing a risk of unnecessary exposure to patients and requiring additional collimator apertures that fail to account for focal point shifts during deflection.
Innovation Solution
A method and system that simulate beam geometry and determine cross-radiation, generating control data to adjust FFS deflection and collimator aperture movements to prevent cross-radiation by reducing deflection or intensity, ensuring the X-ray beam remains within the intended region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If FFS deflection is used to compensate mechanical movement of the X-ray source, then image quality is improved, but cross-radiation occurs when the focal point shifts outside the detector region
Solution Approach 1:
The system performs preliminary simulation of beam geometry at specified FFS deflection positions before actual imaging. Control data is generated in advance that accounts for focal point shifts and prevents cross-radiation by adjusting deflection parameters or collimator aperture positions beforehand, eliminating the need for corrective actions during imaging.
Solution Approach 2:
The system uses simulation results as feedback to generate appropriate FFS control data. The simulated beam geometry information feeds back into the control system to adjust deflection parameters, ensuring that the actual FFS operation stays within safe boundaries and prevents cross-radiation while maintaining image quality.
2Object-affected harmful factors
If collimator apertures are used to limit the X-ray beam, then cross-radiation is reduced, but the apertures fail to account for focal point shifts during FFS deflection
Solution Approach 1:
The system dynamically adjusts collimator aperture positions based on simulated beam geometry at different FFS deflection positions. Rather than using fixed apertures, the control data specifies aperture positions that track and adapt to focal point shifts, ensuring the beam remains properly collimated throughout the FFS deflection range.
Solution Approach 2:
The system changes collimator aperture parameters (position, orientation) based on the simulated beam geometry at each FFS deflection position. This parameter adaptation ensures that the apertures remain effective at limiting cross-radiation while accommodating the dynamic focal point movements inherent to FFS operation.
3Area of stationary object
If the X-ray beam is extended to cover the entire detector region, then detection coverage is improved, but peripheral regions receive unnecessary radiation exposure
Solution Approach 1:
The system applies local quality control by using FFS control data to precisely define the beam footprint at each deflection position. This ensures that X-ray exposure is concentrated only on the necessary detector regions for each specific projection angle, rather than uniformly exposing the entire detector area, thereby reducing unnecessary patient exposure while maintaining adequate coverage.
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
Effectively suppresses cross-radiation, optimizing patient safety and image quality by ensuring the X-ray beam stays within the detector region, reducing unnecessary exposure and improving image clarity.
Implementation Method 1
the electron beam of an X-ray source emitted by the cathode is deflected by a magnetic field, generated, for example, by a magnetic coil, before it hits the anode
Implementation Method 2
If current flows through the FFS deflection coil, it induces a magnetic field and the electron beam is deflected (transverse to its direction of movement) according to the Lorentz force
Implementation Method 3
an X-ray source, comprises a cathode, an anode and additionally the FFS deflection coil as functional elements
Data Source
AI summary
A method for controlling an FFS X-ray system comprises: simulating a beam geometry of the X-ray beam at a specified FFS deflection onto the detector during recording of a projection image; determining whether cross-radiation is present in a region around the detector by the simulated beam geometry of the X-ray beam; generating FFS control data for the recording of the projection image, wherein the FFS control data either (i) causes FFS deflection that is reduced relative to the specified FFS deflection for the recording of the projection image in the event of the cross-radiation being present for the recording of the projection image or (ii) causes the specified FFS deflection otherwise; repeating the simulating, the determining and the generating FFS control data for at least one further recording of a projection image; and generating a control data set including the FFS control data, for controlling an FFS X-ray system.