Fluorine Contrast Agent Nitroxide Relaxation Optimization
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Solution Overview
Problem
Conventional contrast agents for magnetic resonance imaging using fluorine as a detection nucleus fail to achieve high-sensitivity MRI images.
Innovation Solution
A fluorine-containing compound with two nitroxide radical-containing groups and one to three fluorine atom-containing groups, where the nitroxide radicals are bound to the fluorine atoms through a chain structure, is used as a contrast agent to enhance the 19F spin-lattice relaxation time and signal intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional contrast agents are used for 19F-MRI diagnosis, then the diagnostic imaging function is provided, but high-sensitivity MRI images cannot be obtained
Solution Approach 1:
The patent changes the chemical structure parameters of the contrast agent by introducing specific fluorine-containing groups (CF3, CF2, or F) and controlling their数量和 positions. This structural parameter optimization directly improves the 19F spin-lattice relaxation time and signal intensity, achieving high-sensitivity MRI images while maintaining diagnostic reliability
Solution Approach 2:
The patent creates a composite molecular structure combining nitroxide radical-containing groups with fluorine atom-containing groups through chain structures. This composite design synergistically enhances both the relaxation properties and signal intensity, resolving the contradiction between sensitivity and image quality
2Measurement precision
If the 19F spin-lattice relaxation time is optimized for high signal intensity, then MRI sensitivity improves, but the spin-spin relaxation time must be maintained appropriately
Solution Approach 1:
The patent optimizes the spin-lattice relaxation time parameter through specific molecular design while simultaneously controlling the spin-spin relaxation time. By adjusting the fluorine group composition and chain structure, both relaxation parameters are tuned to achieve optimal signal intensity and image quality balance
Solution Approach 2:
The patent introduces different fluorine-containing groups (CF3, CF2, or F) at specific positions in the molecular structure to locally enhance relaxation properties. This localized optimization allows independent tuning of spin-lattice and spin-spin relaxation times to achieve the desired balance
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 compound achieves high-sensitivity magnetic resonance images by optimizing the 19F spin-lattice relaxation time and maintaining appropriate 19F spin-spin relaxation time, resulting in improved signal intensity and diagnostic quality.
Implementation Method 1
two nitroxide radical-containing groups... bound to the fluorine atom-containing groups... to enhance the 19F spin-lattice relaxation time and signal intensity
Data Source
AI summary
The fluorine-containing compound includes: two nitroxide radical-containing groups represented by Formula (1) (R1, R2, R3, and R4 are each independently a C1-10 alkyl group unsubstituted or substituted with a substituent containing no fluorine atoms); and one to three —O—C(CF3)3 groups, in which the nitroxide radical-containing groups are bound to the —O—C(CF3)3 groups through a chain structure with 2 to 17 atoms.