Contrast Kinetics Subtraction Maps for Glioblastoma Tissue Differentiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional MRI methods fail to reliably distinguish between tumor progression and treatment effects such as pseudoprogression and radiation necrosis in glioblastoma patients, leading to inappropriate treatment decisions and potential harm to patients.
Innovation Solution
The use of delayed contrast extravasation MRI to create subtraction maps that differentiate between two primary populations based on contrast clearance and accumulation rates, allowing for the identification of morphologically active tumor and non-tumoral tissue regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional MRI methods are used to assess tumor response, then treatment decisions can be made based on radiographic response, but the specificity is low and cannot reliably distinguish between tumor progression and treatment effects such as pseudoprogression and radiation necrosis
Solution Approach 1:
The patent segments the enhancing lesion into two distinct populations based on contrast agent kinetics: a fast population (clearance faster than accumulation) representing non-tumoral tissue such as treatment effects, and a slow population (clearance slower than accumulation) representing morphologically active tumor. This segmentation allows precise differentiation between tumor progression and treatment effects, resolving the contradiction between measurement precision and reliability.
Solution Approach 2:
The patent changes the assessment parameter from static contrast enhancement intensity to dynamic contrast agent kinetics (accumulation and clearance rates over time). By measuring the temporal behavior of contrast agent distribution and using subtraction maps to visualize these kinetic parameters, the method achieves high specificity in distinguishing tumor from treatment effects, thereby improving both measurement precision and reliability.
2Measurement precision
If delayed contrast extravasation MRI with subtraction maps is used, then high-resolution differentiation between tumor and non-tumoral tissues is achieved, but the imaging protocol complexity increases
Solution Approach 1:
The patent performs preliminary actions by acquiring multiple MRI scans at predetermined time points during the contrast agent's kinetic phase (including delayed imaging at least 20 minutes post-injection) before processing. The subtraction maps are generated by comparing early and delayed images to isolate the slow population. This preliminary data acquisition strategy enables high-resolution tissue differentiation while structuring the complexity in a manageable, protocolized manner.
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 provides high-resolution maps that accurately differentiate between tumor and non-tumoral tissues, enabling appropriate patient management and reducing unnecessary treatments or delays in treatment.
Implementation Method 1
Magnetic resonance maps for analyzing brain tissue
Data Source
AI summary
Apparatus for operating MRI is disclosed. The apparatus comprises: a control for operating an MRI scanner to carry out an MRI scan; an input for receiving first and second MRI scans respectively at the beginning and end of a predetermined time interval post contrast administration; a subtraction map former for forming a subtraction map from the first and the second MRI scans by analyzing the scans to distinguish between a population in which contrast clearance from the tissue is slower than contrast accumulation, and a population in which clearance is faster than accumulation; and an output to provide an indication of distribution of the populations. The control is configured to carry out the first scan at least five minutes and no more than twenty minutes post contrast administration and to carry out the second scan such that the predetermined time period is at least twenty minutes.