MRI Gradient Field Control for Active Contrast Agent Motion
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Solution Overview
Problem
Magnetic resonance imaging techniques for cancer detection and staging, particularly in prostate and breast cancer, suffer from low specificity and require lengthy acquisition times due to reliance on passive perfusion and diffusion of contrast agents, leading to false-positive findings and increased healthcare costs.
Innovation Solution
Introduce an additional magnetic gradient field to actively drive the motion of paramagnetic contrast agents, separate from the magnetic resonance sequence, to enhance diffusion and perfusion measurements, utilizing the magnetic properties of gadolinium-based agents to impart kinetic energy and collect data during periods of constant contrast agent concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive perfusion and diffusion of contrast agents are used in magnetic resonance imaging, then the examination procedure can be performed with standard sequences, but the acquisition time becomes lengthy and sensitivity and specificity are limited
Solution Approach 1:
The patent applies the dynamics principle by transitioning from passive contrast agent diffusion to active-driven diffusion using magnetic gradient fields. The system dynamically controls the motion of paramagnetic contrast agents through externally applied gradient fields, enabling active perfusion and diffusion measurement rather than relying on spontaneous molecular motion. This dynamic approach allows for enhanced measurement capability within reduced time windows.
Solution Approach 2:
The patent utilizes parameter changes by manipulating the magnetic field gradient parameters to control contrast agent motion. By varying the strength and direction of the applied magnetic gradient fields, the system can actively modulate the diffusion and perfusion characteristics of contrast agents, transforming the measurement from passive observation to active manipulation of physical parameters.
2Measurement precision
If passive diffusion of contrast agents is relied upon, then no additional magnetic gradient field is needed, but the measurement precision is insufficient for reliable cancer detection
Solution Approach 1:
The patent applies universality by making the magnetic gradient field serve multiple functions: it simultaneously performs the dual roles of spatial encoding during MRI data acquisition and active driving of contrast agent diffusion for enhanced perfusion measurement. This multi-functionality allows the system to improve measurement precision without requiring entirely separate apparatus, as the gradient system is reused for both purposes.
3Loss of information
If multiple magnetic resonance sequences are combined for multiparametric imaging, then comprehensive tissue information is obtained, but the examination time increases significantly
Solution Approach 1:
The patent applies continuity of useful action by maintaining the contrast agent concentration in the interstitial space continuously through active magnetic gradient field application. Rather than allowing the contrast agent to passively diffuse and clear, the system continuously drives the contrast agent through the tissue, extending the useful measurement window and enabling comprehensive multiparametric imaging within a single examination procedure.
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 significantly enhances sensitivity and specificity in cancer detection and staging, reduces scan times, and provides new insights into tissue structure and permeability by actively influencing contrast agent movement, allowing for more accurate tissue characterization.
Implementation Method 1
an additional magnetic gradient field is output to generate a magnetic movement force acting on the contrast agent in order to introduce kinetic energy into the target area separately from the pulses of the magnetic resonance sequence
Implementation Method 2
the additional gradient field causes the molecules of the paramagnetic contrast agent to move in a predefined direction
Implementation Method 3
The relatively small molecular size of the contrast agent allows it to pass through the vascular endothelium into the interstitial space of tissues by passive diffusion due to a concentration gradient
Data Source
AI summary
A computer-implemented method for operating a magnetic resonance device, the method including: acquiring, as part of an examination process, magnetic resonance data describing diffusion and/or perfusion in a target area of a subject under examination in which an exogenous paramagnetic contrast agent is present, using a magnetic resonance sequence; and prior to at least one acquisition period in which magnetic resonance data of a dynamic data set is acquired using the magnetic resonance sequence, outputting an additional magnetic gradient field to generate a magnetic movement force that acts on the contrast agent to introduce kinetic energy into the target area, wherein the additional magnetic gradient field is output separately from pulses of the magnetic resonance sequence.