Scattered-Radiation Grid Module Edge Web Height

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Solution Overview

Problem

Modular scattered-radiation grids in CT systems suffer from artifacts at the joints of grid modules due to excessive suppression of scattered radiation, leading to reduced image quality.

Innovation Solution

The grid module design features webs with reduced height at the edges, compensating for the increased shielding effect by lowering the overall web height, ensuring consistent scattered radiation absorption across the grid module.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If grid modules are arranged next to one another to form a modular scattered-radiation grid, then the grid can be easily manufactured and installed, but artifacts occur at the joint areas between grid modules that degrade image quality

Engineering Contradiction:

Improvemodular constructionVSAvoidprojection artifacts

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the web height based on position: edge-side webs have reduced height while inner webs maintain full height. This local differentiation compensates for the excessive shielding at joint areas where multiple grid modules connect, preventing artifact formation while preserving the modular construction advantage

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the geometric parameter of web height selectively at edge positions. By reducing the height parameter of edge-side webs compared to inner webs, the patent balances the scattered radiation absorption across the entire grid module, eliminating the parameter inconsistency that causes artifacts at joints

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If web height is reduced at edge sides to compensate for joint shielding, then projection artifacts are suppressed, but the scattered radiation absorption capability may be compromised

Engineering Contradiction:

Improveprojection artifactsVSAvoidscattered radiation absorption

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent maintains high scattered radiation absorption reliability by preserving full web height at inner positions while only reducing height at edge-side webs. This local differentiation ensures that the majority of the grid module maintains optimal absorption capability while only the necessary edge areas have reduced height to prevent artifacts

Inventive Principle:

Principle #3Local 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 design effectively suppresses projection artifacts by maintaining consistent scattered radiation shielding, improving image quality without increasing production costs or compromising structural integrity.

Implementation Method 1

the height of each web disposed at least on an edge side in the respective grid module being lower than the height of webs disposed further inwards in the grid module

Methodology Applied

Scientific EffectScattered radiation absorption: Absorption (EM radiation)

Data Source

PatentUS8681944B2Grid module of a scattered-radiation grid, modular scattered-radiation grid, CT detector and CT system

Publication Date: 2014.03.25 SIEMENS HEALTHINEERS AG

AI summary

A grid module of a scattered-radiation grid is disclosed. The scattered-radiation grid includes a number of grid modules disposed next to one another with a plurality of webs, especially for use in conjunction with a CT detector, a CT detector and a CT system with such a detector. In accordance with an embodiment of the invention, at the joining surfaces of the grid modules, the webs located there, compensating for an excessive reduction in scattered radiation, are embodied lower in their height than the maximum height of the other webs to be found in the grid module.