PET-MRI Fusion for Perfusion-Diffusion Differentiation

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Solution Overview

Problem

Positron emission tomography has low time resolution, making it difficult to differentiate between disturbances in metabolic activity and reduced substance transport in the body, limiting its informativeness and ability to assess revascularization prospects.

Innovation Solution

A method combining positron emission measurements with a second medical imaging technique, such as magnetic resonance or computed tomography, to generate images with higher time resolution for perfusion and diffusion information, allowing for the evaluation of positron emission data based on these additional insights.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If positron emission tomography is used to determine functional images of biochemical and physiological processes, then metabolic activity information is obtained, but time resolution is low and it is difficult to differentiate between metabolic disturbances and reduced substance transport

Engineering Contradiction:

Improveinformation about perfusion and diffusion processesVSAvoidtime resolution

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent combines positron emission tomography with a second medical imaging method (such as MRI or CT) that has superior time resolution. This merging allows simultaneous acquisition of both metabolic information (from PET) and perfusion/diffusion information (from the second method), enabling differentiation between metabolic disturbances and transport issues without losing temporal details

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The second imaging method acts as an intermediary that provides high-time-resolution perfusion and diffusion information. This intermediary data is then used to evaluate and contextualize the PET measurement information, allowing indirect determination of transport processes that the PET method alone cannot resolve temporally

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If only positron emission tomography is performed, then metabolic activity can be measured, but the ability to assess revascularization prospects is limited

Engineering Contradiction:

Improvedifferentiation between metabolic disturbances and perfusion issuesVSAvoidcombination of multiple imaging methods

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges PET with a second imaging method to achieve precise differentiation between metabolic and perfusion disturbances. This combination enables accurate assessment of revascularization prospects by providing both metabolic context and temporal transport information, despite the increased system complexity

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The evaluation of PET measurement information is enhanced by feedback from the second imaging method's perfusion and diffusion data. This feedback loop allows continuous refinement of the interpretation of metabolic measurements, improving diagnostic precision for revascularization assessment

Inventive Principle:

Principle #23Feedback

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 enhances the informativeness of positron emission tomography by differentiating between perfusion and diffusion processes, enabling more accurate assessment of metabolic disturbances and improving diagnostic capabilities for conditions like tumors, with the potential for real-time evaluation and presentation of results.

Implementation Method 1

the distribution of a radioactive marker substance in the body of a subject being examined is determined

Methodology Applied

Scientific EffectRadioactive decay: Radioactive Decay

Implementation Method 2

determine perfusion and/or diffusion information for at least a part of the measurement period

Methodology Applied

Scientific EffectPerfusion:

Implementation Method 3

determine perfusion and/or diffusion information

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS7482592B2Method for combining PET with MR perfusion and diffusion

Publication Date: 2009.01.27 SIEMENS HEALTHINEERS AG

AI summary

A method for determining positron emission measurement information in the context of positron emission tomography is disclosed. The method includes using a marker substance to carry out a positron emission measurement, in a body area of a subject to be examined, to determine positron emission measurement information, and at the same time, generating images of the body area to be examined by way of a second medical method with a time resolution suitable for determining perfusion and/or diffusion information. The method further includes using the images from the second method to determine perfusion and/or diffusion information for at least a part of the measurement period, and evaluating the positron emission measurement information as a function of the perfusion and/or diffusion information.