Multilayer X-Ray Anode for Higher Monochromatic Output

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Solution Overview

Problem

Conventional X-ray tubes struggle to maximize the proportion of monochromatic X-ray radiation, leading to suboptimal image quality and increased X-ray doses during imaging examinations, particularly in mammography.

Innovation Solution

The X-ray tube features a multilayer anode with a first anode layer generating braking radiation and a second anode layer producing more monochromatic X-rays from the braking radiation, with the layers arranged in a periodically recurring microstructure to enhance the proportion of monochromatic X-rays, and the electron beam incident at an angle between 10° and 60°.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional filters are used to adjust the emission spectrum, then image quality is optimized, but the X-ray intensity is reduced requiring increased intensity to compensate

Engineering Contradiction:
Improveimage qualityVSAvoidX-ray intensity
Core Design Contradiction:
Measurement precisionVSLoss of energy

Solution Approach 1:

The anode is segmented into multiple layers with different materials (e.g., tungsten for bremsstrahlung, molybdenum or rhodium for characteristic radiation). Each layer segment contributes differently to the emission spectrum, allowing simultaneous generation of broad-spectrum and monochromatic X-rays without requiring external filters that would attenuate the beam.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The anode uses composite material structure with multiple anode materials deposited in specific configurations. This composite structure enables the generation of both bremsstrahlung radiation from high-Z materials and characteristic monochromatic radiation from lower-Z materials, resolving the contradiction between image quality optimization and X-ray intensity maintenance.

Inventive Principle:
Principle #40Composite materials

2Measurement precision

If the anode material is varied to adjust the emission spectrum, then monochromatic X-ray proportion is increased, but the device complexity increases

Engineering Contradiction:
Improvemonochromatic X-ray proportionVSAvoidanode structure complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The anode structure employs a nested configuration where thinner layers of characteristic radiation materials are deposited on or within thicker layers of bremsstrahlung-generating materials. This nested arrangement allows the inner layers to generate bremsstrahlung that penetrates to the outer layers, which then convert portions of it to characteristic monochromatic radiation, achieving high monochromatic proportion without complex external systems.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

Instead of varying materials in a single dimension (different anode blocks), the invention uses vertical layering (adding a depth dimension) with multiple thin anode layers. This layered approach enables spectral control through material composition and thickness variations rather than requiring multiple separate anode components, reducing overall device complexity.

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

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 configuration increases the proportion of monochromatic X-ray radiation, optimizing image quality and reducing X-ray doses, making it suitable for various imaging examinations including mammography, fluoroscopy, and computer tomography.

Implementation Method 1

the first anode material for generating bremsstrahlung by means of the incident electron beam

Methodology Applied
Scientific EffectBremsstrahlung:

Implementation Method 2

the second anode material is a converter material, wherein the second anode layer comprises a second anode material for generating further x-ray radiation by means of the bremsstrahlung

Methodology Applied
Scientific EffectFluorescence: Fluorescence

Data Source

PatentEP3751594B1X-ray tube
Publication Date: 2024.08.28 SIEMENS HEALTHINEERS AG
  • EP3751594B1 patent drawingFigure 1~2
  • EP3751594B1 patent drawingFigure 3~4

AI summary

The invention relates to an X-ray tube, an X-ray device, and a mammography device. The X-ray tube according to the invention comprises: an electron emitter emitting an electron beam; and a multilayer anode, wherein the multilayer anode has a first anode layer facing the electron beam and a second anode layer facing away from the electron beam; wherein the first anode layer has a first anode material for generating bremsstrahlung by means of the incident electron beam; wherein the second anode layer has a second anode material for generating further X-rays by means of the bremsstrahlung; wherein the further X-rays are more monochromatic than the bremsstrahlung; and wherein the first anode layer and the second anode layer are adjacent to each other over a planar area.