Pre-Collimator Beam Shaping for Scatter and Dose Reduction

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Solution Overview

Problem

Existing radiation beam systems in medical imaging, such as CT, lack efficient methods to modify beam intensity and shape, leading to inefficiencies in scatter management and increased radiation exposure.

Innovation Solution

A pre-collimator system with movable and fixed parts, combined with beam hardening filters, is positioned near the radiation source to align with the central beam axis, reducing scatter and optimizing beam shape and intensity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a pre-collimator is used to reduce scatter radiation, then image quality is improved, but the device complexity increases

Engineering Contradiction:

Improveimage qualityVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The pre-collimator is divided into multiple collimator blades that can be independently adjusted, allowing selective positioning to optimize scatter reduction while maintaining manageable system complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The collimator blades are made movable and adjustable rather than fixed, enabling dynamic optimization of the beam shape and scatter reduction for different imaging scenarios, resolving the contradiction between performance and complexity through adaptability

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If beam shaping filters are used to optimize radiation beam shape, then image quality is improved, but the radiation exposure time increases

Engineering Contradiction:

Improveimage qualityVSAvoidradiation exposure time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The beam shaping filter is positioned in the pre-collimation stage before the main imaging process, allowing the radiation beam to be pre-shaped and optimized before reaching the patient, thereby reducing the required exposure time while maintaining image quality

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The beam shaping filter acts as an intermediary element between the radiation source and the patient, modifying the beam characteristics in advance to achieve both image quality improvement and reduced exposure time

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If the pre-collimator is positioned to align with the central beam axis, then scatter reduction is optimized, but the beam hardening effect increases

Engineering Contradiction:

Improvescatter radiationVSAvoidbeam hardening

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The pre-collimator positioning is made adjustable, allowing optimization of the balance between scatter reduction and beam hardening effects based on specific imaging requirements, resolving the contradiction through dynamic control

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The angular position and orientation of the pre-collimator blades can be modified to change the beam characteristics, allowing optimization of scatter reduction while controlling beam hardening by adjusting collimation angles

Inventive Principle:

Principle #35Parameter changes

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

The system enhances scatter management, reduces radiation exposure, and improves image quality by aligning the pre-collimator parts with the beam axis, allowing for more accurate and efficient radiation delivery.

Implementation Method 1

The system incorporates a pre-collimator with moveable and fixed parts, along with a shape filter, which can be positioned to align with or out of the central beam axis, and beam hardening filters, to control and shape the radiation beam, reducing scatter

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)