X-ray dose distribution calculation using compensating filter model
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for determining radiation exposure information in imaging X-ray devices do not accurately account for inhomogeneous dose distributions caused by compensating filters, leading to potential underestimation of local X-ray doses.
Innovation Solution
A computer-implemented method that uses a filter model to calculate dose distribution information, taking into account the geometry and material of compensating filters like wedge filters, to determine patient entrance dose information spatially resolved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If compensating filters are used to achieve homogeneous dose distribution, then dose uniformity is improved, but measurement accuracy deteriorates because existing measurement methods do not account for the inhomogeneity introduced by the filters
Solution Approach 1:
The patent changes the measurement approach by introducing a virtual measuring device that calculates dose distribution parameters spatially resolved, rather than using a single integrated measurement. The system determines preliminary dose information assuming homogeneous distribution, then applies filter parameters (geometry, material, position) to calculate the actual inhomogeneous dose distribution, thereby resolving the contradiction between achieving homogeneous distribution and measuring it accurately.
Solution Approach 2:
The patent creates a virtual copy of the measuring device that replicates the dose distribution characteristics without requiring physical presence in the beam path. This virtual measuring device models the inhomogeneous dose distribution caused by compensating filters, allowing accurate measurement without the physical constraints and scattering issues of traditional measuring devices.
2Measurement precision
If traditional measuring devices are used to determine radiation exposure, then measurement capability is provided, but device complexity and installation space requirements increase
Solution Approach 1:
The patent replaces the physical measuring device (DAP chamber) with a computational model that performs measurements virtually. Instead of using a physical device that requires installation space and causes scattering, the system uses a control unit with a processor to calculate dose distribution based on filter parameters and preliminary dose information, thereby eliminating the need for complex physical measuring apparatus.
Solution Approach 2:
The patent creates a virtual copy of the measuring function that replicates radiation exposure measurement capabilities without requiring physical presence in the beam path. The virtual measuring device uses computational algorithms to determine dose distribution, eliminating the need for physical measuring devices and their associated complexity and space requirements.
3Stability of the object's composition
If compensating filters are used to correct dose inhomogeneity, then dose distribution quality is improved, but the complexity of the X-ray system increases
Solution Approach 1:
The patent manages system complexity by parameterizing the compensating filter characteristics (geometry, material, position) and using these parameters in calculations rather than requiring complex real-time control. The system determines preliminary dose information and then applies filter parameters to calculate the actual dose distribution, simplifying the control approach while maintaining dose distribution quality.
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 allows for more accurate determination of radiation exposure information by accounting for inhomogeneities caused by compensating filters, ensuring that local X-ray doses are not underestimated.
Implementation Method 1
compensating filters, which attenuate homogeneously and affect the spectrum
Data Source
AI summary
A computer-implemented method for determining spatially resolved radiation exposure information for a patient during an examination by an imaging X-ray device includes: determining preliminary dose information, when a compensating filter is used that is arranged between the patient and the X-ray tube unit in the X-ray field and causes an inhomogeneous dose distribution in the plane perpendicular to a central ray of the X-ray field; calculating dose distribution information using the preliminary dose information, which specifies at least the dose distribution of the X-ray dose acting on the patient in the portion of the X-ray field covered by the compensating filter, by a filter model that uses at least one filter parameter specifying the compensating filter and its arrangement in the X-ray field; and determining the patient entrance dose information using the dose distribution information.