X-ray dose measurement detector integrated into source housing

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Solution Overview

Problem

Existing X-ray imaging systems face challenges in measuring X-ray doses efficiently due to the need for separate ionization chambers, which occupy valuable space and provide incomplete dose distribution information, leading to potential over or underestimation of radiation risks.

Innovation Solution

An X-ray parameter measuring arrangement with a detector positioned adjacent to the X-ray source to measure scattered or direct radiation, utilizing stacked diode layers with radiation filters and a processing unit, integrated into the X-ray source housing or collimator, to minimize space usage and interference with the image, while measuring parameters like total dose, dose rate, and ray quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a separate ionization chamber is provided between the object and detector to measure X-ray dose, then dose measurement capability is improved, but constructional space is consumed and positioning stability deteriorates

Engineering Contradiction:
Improvedose measurement capabilityVSAvoidconstructional space
Core Design Contradiction:
Measurement precisionVSVolume of stationary object

Solution Approach 1:

The patent integrates the dose measurement function directly into the X-ray detector by incorporating an ionization chamber within the detector housing. This merging of the dose measurement component with the existing detector structure eliminates the need for separate ionization chambers, thereby reducing constructional space while maintaining dose measurement capability. The integrated design allows the detector to simultaneously perform imaging and dose measurement functions.

Inventive Principle:
Principle #5Merging (Combining)

2Measurement precision

If a separate ionization chamber is used for dose measurement, then dose measurement is enabled, but positioning stability worsens due to displacement risk

Engineering Contradiction:
Improvedose measurement capabilityVSAvoidpositioning stability
Core Design Contradiction:
Measurement precisionVSStability of the object's composition

Solution Approach 1:

By integrating the ionization chamber within the detector housing, the patent eliminates the separate positioning requirements for dose measurement. The merged structure ensures that the dose measurement component moves with the detector as a single unit, preventing displacement and maintaining stable positioning throughout the imaging procedure.

Inventive Principle:
Principle #5Merging (Combining)

3Measurement precision

If a separate ionization chamber is positioned to intercept the entire X-ray beam for DAP measurement, then total dose measurement is improved, but interference with the reproduced image increases

Engineering Contradiction:
Improvetotal dose measurement accuracyVSAvoidinterference with reproduced image
Core Design Contradiction:
Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent positions the integrated ionization chamber to measure scattered radiation in a different spatial dimension - specifically, detecting radiation that has scattered at angles rather than measuring the primary beam directly. This dimensional shift in measurement approach allows accurate dose assessment without intercepting the primary X-ray beam path, thereby avoiding interference with the reproduced image.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

4Measurement precision

If DAP meter is used to measure integral dose across the beam, then total dose estimation is improved, but dose distribution information is lost leading to inaccurate risk estimation

Engineering Contradiction:
Improvetotal dose estimationVSAvoiddose distribution information
Core Design Contradiction:
Measurement precisionVSLoss of information

Solution Approach 1:

The patent divides the dose measurement into multiple spatial segments by using an array of detection elements within the detector. Instead of a single integrated DAP measurement, the segmented detector structure allows measurement of dose at multiple locations and angles, capturing the distribution pattern of scattered radiation. This segmentation preserves dose distribution information while still providing total dose estimation, enabling more accurate risk assessment.

Inventive Principle:
Principle #1Segmentation

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

Enables precise measurement of X-ray parameters without interfering with the image, providing accurate dose distribution information and reducing radiation risk estimation errors, while optimizing space usage in X-ray imaging systems.

Implementation Method 1

a detector for measuring said parameter configured to be positioned in a position adjacent to an x-ray source arranged to generate a ray formation

Methodology Applied
Scientific EffectPhotoelectric effect: Photoelectric Effect

Data Source

PatentEP3004931B2An arrangement for measuring an x-ray dose parameter in an x-ray image apparatus and an x-ray detector.
Publication Date: 2021.10.20 UNFORS RAYSAFE
  • EP3004931B2 patent drawingFigure 1
  • EP3004931B2 patent drawingFigure 2a
  • EP3004931B2 patent drawingFigure 2b

AI summary

The present invention relates to an arrangement (205, 2051, 2052, 2053, 2054, 2055, 305, 405) for measuring a X-ray dose parameter. The arrangement comprises a detector (3051, 3052) for detecting said x-ray dose. The arrangement is configured to be positioned in a position adjacent to an x-ray source (201) arranged to generate a ray formation having a primary ray portion for radiating an object (206), wherein said position is chosen in such a way that the interference with a reproduced image is reduced or eliminated.